Thanks Takashi,
I did a bit more testing last night. The LED does work after a reboot (I don't know what I was doing that I thought it didn't). It also retains state after a reboot if I muted it before the reboot. One thing I noticed, if I have it muted when I suspend, on resume, it looks like the mute led flashes back on for a split second, then turns off. Maybe the resume code is overwriting the register? I'll start digging through that code tonight.
Ryan
On Thu, Apr 30, 2009 at 1:53 AM, Takashi Iwai tiwai@suse.de wrote:
At Thu, 30 Apr 2009 00:43:02 -0400, Ryan Dunn wrote:
Thanks Lee,
I grabbed the kernel source from the repos and started perusing the
code. It
looks like when the module is installed, the call chain starts in
atiixp.c and
moves into ac97/ac97_codec.c via a call to snd_ac97_tune_hardware() which ultimately twiddles a bit in the AC97_POWERDOWN register. I'm not sure
yet if
the suspend method properly saves this register on suspend or not;
It should. snd_ac97_resume() writes the cached value. Check /proc/asound/card0/codec97#0/ac97#*+regs files before and after suspend. You can change the codec register value directly via proc file, e.g. # echo 0x12 0x1234 > /proc/asound/card0/codec97#0/ac97#0-0+regs (only when you build with the debug option).
The bit 0x8000 of the power-down register should correspond to LED.
Takashi
or if the same call chain needs to be repeated on a resume. I appreciate your
quick and
relevant answer. When I get time, I'll start adding some debug printouts
to
try this out.
Also, the struct ac97_quirk ac97_quirks[] array has a couple of entries
in it
currently (in the atiixp.c file). How do I get the subvender/subdevice
id's
for my system (I didn't seem to have luck with lspci, unless I'm not
looking
in the right fields)? Would it be possible to edit the driver so that an explict module option would not be needed on my hardware?
Thanks, Ryan
On Wed, Apr 29, 2009 at 10:42 PM, Lee Revell rlrevell@joe-job.com
wrote:
On Wed, Apr 29, 2009 at 12:06 AM, Ryan Dunn <oryandunn.ml@gmail.com> wrote: > I have a Compaq V2000 laptop with the ATI IXP chipset and make useof
the > snd-atiixp module. The laptop needs to have the ac97_quirk optionset
to 7 > to enable the mute LED. After setting this option in the > /etc/modprobe.d/options.conf file, the mute LED works after areboot.
> However, after a resume from suspend or hibernate, the mute LEDdoes not
> work. The alsa-info.sh script reports that the quirk is still setwith
7. > At this point a reboot will NOT fix the problem. The only way tofix it
is > to remove and reinsert the module with modprobe. > > This is on a fresh Ubuntu 9.04 install. Any ideas? I wasn't sureif
this > should be reported here or on the kernel list. I saw a similarissue
with > the ac97_quirk on the kernel list and they were referred here. I'ma
> software developer, so I'd be willing to try ideas/possiblesolutions if
you > have them. Get the Ubuntu source code for the package that owns that ALSAdriver,
find the place in the driver's initialization code where ac97_quirk=7 is handled, then check the driver's suspend and resume callbacks and make sure the suspend callback is correctly saving the LED state and that the resume callback is re-initializing the LED from the saved state in the same way the init code does. grep and printk() are your friends ;-) HTH, Lee
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel