At Wed, 7 Nov 2012 09:22:33 +0100, David Henningsson wrote:
On some of the PantherPoint HDMI machines we currently enable, we're seeing trouble with unsol events, i e detecting monitor presence, especially when on battery and after suspend/resume.
BugLink: https://bugs.launchpad.net/bugs/1075882 Tested-by: Cyrus Lien cyrus.lien@canonical.com Signed-off-by: David Henningsson david.henningsson@canonical.com
sound/pci/hda/patch_hdmi.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
So far this is the workaround we have found to be working. Sometimes, it also seems that "cat /proc/asound/cardx/codec#x" can also make the HDMI unsol event trigger, so that the problem fixes itself.
We have not run any battery life tests to see if this causes more power consumption.
Looks safe at least, so I applied to for-next branch to give more testing. If you find a better solution, let me know.
thanks,
Takashi
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 39ca100..3155267 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -1288,13 +1288,17 @@ static int hdmi_parse_codec(struct hda_codec *codec) } }
+#ifdef CONFIG_PM
- /* We're seeing some problems with unsolicited hot plug events on
* PantherPoint after S3, if this is not enabled */- if (codec->vendor_id == 0x80862806)
codec->bus->power_keep_link_on = 1;*/
- G45/IbexPeak don't support EPSS: the unsolicited pin hot plug event
- can be lost and presence sense verb will become inaccurate if the
- HDA link is powered off at hot plug or hw initialization time.
-#ifdef CONFIG_PM
- if (!(snd_hda_param_read(codec, codec->afg, AC_PAR_POWER_STATE) &
- else if (!(snd_hda_param_read(codec, codec->afg, AC_PAR_POWER_STATE) & AC_PWRST_EPSS)) codec->bus->power_keep_link_on = 1;
#endif
1.7.9.5