[alsa-devel] [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
This also changes azx_runtime_resume to actually call snd_hdac_set_codec_wakeup for Skylake (before STATETS read). (Otherwise it would only have been called for Haswell and Broadwell, which both do not need it, so this probably was not the author's intention.)
Signed-off-by: David Henningsson david.henningsson@canonical.com --- sound/hda/hdac_i915.c | 5 ++++- sound/pci/hda/hda_intel.c | 18 ++++++++++-------- 2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c index 442500e..5676b84 100644 --- a/sound/hda/hdac_i915.c +++ b/sound/hda/hdac_i915.c @@ -56,8 +56,11 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable) enable ? "enable" : "disable");
if (enable) { - if (!bus->i915_power_refcount++) + if (!bus->i915_power_refcount++) { acomp->ops->get_power(acomp->dev); + snd_hdac_set_codec_wakeup(bus, true); + snd_hdac_set_codec_wakeup(bus, false); + } } else { WARN_ON(!bus->i915_power_refcount); if (!--bus->i915_power_refcount) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index ca151b4..9962237 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -979,14 +979,16 @@ static int azx_runtime_resume(struct device *dev) if (!azx_has_pm_runtime(chip)) return 0;
- if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL - && hda->need_i915_power) { - bus = azx_bus(chip); - snd_hdac_display_power(bus, true); - haswell_set_bclk(hda); - /* toggle codec wakeup bit for STATESTS read */ - snd_hdac_set_codec_wakeup(bus, true); - snd_hdac_set_codec_wakeup(bus, false); + if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { + bus = azx_bus(chip); + if (hda->need_i915_power) { + snd_hdac_display_power(bus, true); + haswell_set_bclk(hda); + } else { + /* toggle codec wakeup bit for STATESTS read */ + snd_hdac_set_codec_wakeup(bus, true); + snd_hdac_set_codec_wakeup(bus, false); + } }
/* Read STATESTS before controller reset */
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
This also changes azx_runtime_resume to actually call snd_hdac_set_codec_wakeup for Skylake (before STATETS read). (Otherwise it would only have been called for Haswell and Broadwell, which both do not need it, so this probably was not the author's intention.)
Signed-off-by: David Henningsson david.henningsson@canonical.com
sound/hda/hdac_i915.c | 5 ++++- sound/pci/hda/hda_intel.c | 18 ++++++++++-------- 2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c index 442500e..5676b84 100644 --- a/sound/hda/hdac_i915.c +++ b/sound/hda/hdac_i915.c @@ -56,8 +56,11 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable) enable ? "enable" : "disable");
if (enable) {
if (!bus->i915_power_refcount++)
if (!bus->i915_power_refcount++) { acomp->ops->get_power(acomp->dev);snd_hdac_set_codec_wakeup(bus, true);snd_hdac_set_codec_wakeup(bus, false);
Mostly we have called snd_hdac_set_codec_wakeup() after calling Snd_hdac_display_power(true). It seems we missed it in the link_power().
I agree moving snd_hdac_set_codec_wakeup() to here is better. I would like do a full test on this patch.
}diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index ca151b4..9962237 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -979,14 +979,16 @@ static int azx_runtime_resume(struct device *dev) if (!azx_has_pm_runtime(chip)) return 0;
- if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL
&& hda->need_i915_power) {bus = azx_bus(chip);snd_hdac_display_power(bus, true);haswell_set_bclk(hda);/* toggle codec wakeup bit for STATESTS read */snd_hdac_set_codec_wakeup(bus, true);snd_hdac_set_codec_wakeup(bus, false);
- if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
bus = azx_bus(chip);if (hda->need_i915_power) {snd_hdac_display_power(bus, true);haswell_set_bclk(hda);} else {/* toggle codec wakeup bit for STATESTS read*/
snd_hdac_set_codec_wakeup(bus, true);snd_hdac_set_codec_wakeup(bus, false);}}
/* Read STATESTS before controller reset */
-- 1.9.1
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04. - Upgrade to kernel 4.1. - Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-23.24 (which has a backported i915 driver), and then the alsa-daily DKMS on top of that.
I can email you off-list with details about the machine I tested it on, if you like.
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-23.24 (which has a backported i915 driver), and then the alsa-daily DKMS on top of that.
I can email you off-list with details about the machine I tested it on, if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at the last time, too. But the boot with the DP plugged worked well even on an old SKL box.
Takashi
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-23.24 (which has a backported i915 driver), and then the alsa-daily DKMS on top of that.
I can email you off-list with details about the machine I tested it on, if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at the last time, too. But the boot with the DP plugged worked well even on an old SKL box.
For this bug, there was no HDMI monitor connected at all, but I believe it does not matter. On power up, the power well is enabled and then disabled. When the power well is enabled again without this extra wakeup poke (probably due to PulseAudio probing), this error happens.
On Thu, 16 Jul 2015 17:37:41 +0200, David Henningsson wrote:
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-23.24 (which has a backported i915 driver), and then the alsa-daily DKMS on top of that.
I can email you off-list with details about the machine I tested it on, if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at the last time, too. But the boot with the DP plugged worked well even on an old SKL box.
For this bug, there was no HDMI monitor connected at all, but I believe it does not matter. On power up, the power well is enabled and then disabled. When the power well is enabled again without this extra wakeup poke (probably due to PulseAudio probing), this error happens.
Ah, that's interesting. So this happens when no monitor is connected. I haven't seen this, though; maybe depends on the board or BIOS.
Takashi
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Thursday, July 16, 2015 11:54 PM To: David Henningsson Cc: Yang, Libin; hui.wang@canonical.com; alsa-devel@alsa-project.org; Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Thu, 16 Jul 2015 17:37:41 +0200, David Henningsson wrote:
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson
[mailto:david.henningsson@canonical.com]
Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is
powered
down on Skylake, the power well is turned off. When the codec is
then
powered up again, we need to poke the codec a little extra to
make
sure it wakes up. Otherwise we'll get sad "no response from
codec"
messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such
issue
before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-
23.24
(which has a backported i915 driver), and then the alsa-daily
DKMS on
top of that.
I can email you off-list with details about the machine I tested it
on,
if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at the
last
time, too. But the boot with the DP plugged worked well even on
an
old SKL box.
For this bug, there was no HDMI monitor connected at all, but I
believe
it does not matter. On power up, the power well is enabled and then disabled. When the power well is enabled again without this extra
wakeup
poke (probably due to PulseAudio probing), this error happens.
Ah, that's interesting. So this happens when no monitor is connected. I haven't seen this, though; maybe depends on the board or BIOS.
On SKL, each time turning on power well 2, display codec need extra wakeup poke.
If there is monitor connected, power well will not be turned off even audio driver asks to.
If there is monitor connected, power well will be really turned off. In this case, when hdmi audio is used, we must do the wakeup poke.
Takashi
On Fri, 17 Jul 2015 04:28:10 +0200, Yang, Libin wrote:
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Thursday, July 16, 2015 11:54 PM To: David Henningsson Cc: Yang, Libin; hui.wang@canonical.com; alsa-devel@alsa-project.org; Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Thu, 16 Jul 2015 17:37:41 +0200, David Henningsson wrote:
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
> -----Original Message----- > From: David Henningsson
[mailto:david.henningsson@canonical.com]
> Sent: Thursday, July 16, 2015 4:39 PM > To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- > project.org; Yang, Libin; Lin, Mengdong > Cc: David Henningsson > Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout > > When the controller is powered up but the HDMI codec is
powered
> down > on Skylake, the power well is turned off. When the codec is
then
> powered up again, we need to poke the codec a little extra to
make
> sure it wakes up. Otherwise we'll get sad "no response from
codec"
> messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such
issue
before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-
23.24
(which has a backported i915 driver), and then the alsa-daily
DKMS on
top of that.
I can email you off-list with details about the machine I tested it
on,
if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at the
last
time, too. But the boot with the DP plugged worked well even on
an
old SKL box.
For this bug, there was no HDMI monitor connected at all, but I
believe
it does not matter. On power up, the power well is enabled and then disabled. When the power well is enabled again without this extra
wakeup
poke (probably due to PulseAudio probing), this error happens.
Ah, that's interesting. So this happens when no monitor is connected. I haven't seen this, though; maybe depends on the board or BIOS.
On SKL, each time turning on power well 2, display codec need extra wakeup poke.
If there is monitor connected, power well will not be turned off even audio driver asks to.
If there is monitor connected, power well will be really turned off. In this case, when hdmi audio is used, we must do the wakeup poke.
So the patch does the right thing? I'm currently waiting for an ack from you Intel people as this is highly specific to the chipset detail. Please give reviewed-by, acked-by or whatever if the patch is OK.
thanks,
Takashi
Hi Takashi,
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Friday, July 17, 2015 9:02 PM To: Yang, Libin Cc: David Henningsson; hui.wang@canonical.com; alsa-devel@alsa- project.org; Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Fri, 17 Jul 2015 04:28:10 +0200, Yang, Libin wrote:
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Thursday, July 16, 2015 11:54 PM To: David Henningsson Cc: Yang, Libin; hui.wang@canonical.com; alsa-devel@alsa-
project.org;
Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Thu, 16 Jul 2015 17:37:41 +0200, David Henningsson wrote:
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote: >> -----Original Message----- >> From: David Henningsson
[mailto:david.henningsson@canonical.com]
>> Sent: Thursday, July 16, 2015 4:39 PM >> To: tiwai@suse.de; hui.wang@canonical.com; alsa-
devel@alsa-
>> project.org; Yang, Libin; Lin, Mengdong >> Cc: David Henningsson >> Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout >> >> When the controller is powered up but the HDMI codec is
powered
>> down >> on Skylake, the power well is turned off. When the codec is
then
>> powered up again, we need to poke the codec a little extra
to
make
>> sure it wakes up. Otherwise we'll get sad "no response
from
codec"
>> messages and broken audio. > > Thanks for finding this issue. > > Could you please give us you test case? We didn't meet such
issue
> before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my
case I
have been running a hybrid kernel: Ubuntu 15.04, kernel
3.19.0-
23.24
(which has a backported i915 driver), and then the alsa-daily
DKMS on
top of that.
I can email you off-list with details about the machine I tested
it
on,
if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at
the
last
time, too. But the boot with the DP plugged worked well even
on
an
old SKL box.
For this bug, there was no HDMI monitor connected at all, but I
believe
it does not matter. On power up, the power well is enabled and
then
disabled. When the power well is enabled again without this
extra
wakeup
poke (probably due to PulseAudio probing), this error happens.
Ah, that's interesting. So this happens when no monitor is connected. I haven't seen this, though; maybe depends on the
board
or BIOS.
On SKL, each time turning on power well 2, display codec need extra wakeup poke.
If there is monitor connected, power well will not be turned off even audio driver asks to.
If there is monitor connected, power well will be really turned off. In this case, when hdmi audio is used, we must do the wakeup poke.
So the patch does the right thing? I'm currently waiting for an ack from you Intel people as this is highly specific to the chipset detail. Please give reviewed-by, acked-by or whatever if the patch is OK.
The patch is right. I have reviewed the patch and Our QA has verified it.
thanks,
Takashi
On Mon, 20 Jul 2015 09:14:15 +0200, Yang, Libin wrote:
Hi Takashi,
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Friday, July 17, 2015 9:02 PM To: Yang, Libin Cc: David Henningsson; hui.wang@canonical.com; alsa-devel@alsa- project.org; Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Fri, 17 Jul 2015 04:28:10 +0200, Yang, Libin wrote:
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Thursday, July 16, 2015 11:54 PM To: David Henningsson Cc: Yang, Libin; hui.wang@canonical.com; alsa-devel@alsa-
project.org;
Lin, Mengdong; Lu, Han Subject: Re: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
On Thu, 16 Jul 2015 17:37:41 +0200, David Henningsson wrote:
On 2015-07-16 17:34, Takashi Iwai wrote:
On Thu, 16 Jul 2015 17:31:33 +0200, David Henningsson wrote: > > > > On 2015-07-16 17:14, Yang, Libin wrote: >>> -----Original Message----- >>> From: David Henningsson
[mailto:david.henningsson@canonical.com]
>>> Sent: Thursday, July 16, 2015 4:39 PM >>> To: tiwai@suse.de; hui.wang@canonical.com; alsa-
devel@alsa-
>>> project.org; Yang, Libin; Lin, Mengdong >>> Cc: David Henningsson >>> Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout >>> >>> When the controller is powered up but the HDMI codec is
powered
>>> down >>> on Skylake, the power well is turned off. When the codec is
then
>>> powered up again, we need to poke the codec a little extra
to
make
>>> sure it wakes up. Otherwise we'll get sad "no response
from
codec"
>>> messages and broken audio. >> >> Thanks for finding this issue. >> >> Could you please give us you test case? We didn't meet such
issue
>> before. I would like do a full test on it. > > The test case is: > > - Install Ubuntu 15.04. > - Upgrade to kernel 4.1. > - Boot the new kernel. > > Note: I believe Hui tested with 4.1 and got this error. In my
case I
> have been running a hybrid kernel: Ubuntu 15.04, kernel
3.19.0-
23.24
> (which has a backported i915 driver), and then the alsa-daily
DKMS on
> top of that. > > I can email you off-list with details about the machine I tested
it
on,
> if you like.
Did you hotplug the device or is it booted while plugged? I had an unstable communication at hotplug / unplug on SKL at
the
last
time, too. But the boot with the DP plugged worked well even
on
an
old SKL box.
For this bug, there was no HDMI monitor connected at all, but I
believe
it does not matter. On power up, the power well is enabled and
then
disabled. When the power well is enabled again without this
extra
wakeup
poke (probably due to PulseAudio probing), this error happens.
Ah, that's interesting. So this happens when no monitor is connected. I haven't seen this, though; maybe depends on the
board
or BIOS.
On SKL, each time turning on power well 2, display codec need extra wakeup poke.
If there is monitor connected, power well will not be turned off even audio driver asks to.
If there is monitor connected, power well will be really turned off. In this case, when hdmi audio is used, we must do the wakeup poke.
So the patch does the right thing? I'm currently waiting for an ack from you Intel people as this is highly specific to the chipset detail. Please give reviewed-by, acked-by or whatever if the patch is OK.
The patch is right. I have reviewed the patch and Our QA has verified it.
OK, I queued the patch now. Thanks.
Takashi
On 07/16/2015 11:31 PM, David Henningsson wrote:
On 2015-07-16 17:14, Yang, Libin wrote:
-----Original Message----- From: David Henningsson [mailto:david.henningsson@canonical.com] Sent: Thursday, July 16, 2015 4:39 PM To: tiwai@suse.de; hui.wang@canonical.com; alsa-devel@alsa- project.org; Yang, Libin; Lin, Mengdong Cc: David Henningsson Subject: [PATCH v2] ALSA: hda - Fix Skylake codec timeout
When the controller is powered up but the HDMI codec is powered down on Skylake, the power well is turned off. When the codec is then powered up again, we need to poke the codec a little extra to make sure it wakes up. Otherwise we'll get sad "no response from codec" messages and broken audio.
Thanks for finding this issue.
Could you please give us you test case? We didn't meet such issue before. I would like do a full test on it.
The test case is:
- Install Ubuntu 15.04.
- Upgrade to kernel 4.1.
- Boot the new kernel.
Note: I believe Hui tested with 4.1 and got this error. In my case I have been running a hybrid kernel: Ubuntu 15.04, kernel 3.19.0-23.24 (which has a backported i915 driver), and then the alsa-daily DKMS on top of that.
I can email you off-list with details about the machine I tested it on, if you like.
Here is a dmesg log, it is generated on a skl laptop with drm-intel-nightly kernel (v4.2), searching the keyword "timeout" in the text, you will find lots of timeout errors.
participants (4)
-
David Henningsson -
Hui Wang -
Takashi Iwai -
Yang, Libin