[alsa-devel] module snd-atiixp issue with suspend/hibernate/resume
oryandunn.ml at gmail.com
Thu Apr 30 13:49:57 CEST 2009
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.
On Thu, Apr 30, 2009 at 1:53 AM, Takashi Iwai <tiwai at 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.
> > 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
> > 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
> > for my system (I didn't seem to have luck with lspci, unless I'm not
> > 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 at joe-job.com>
> > On Wed, Apr 29, 2009 at 12:06 AM, Ryan Dunn <oryandunn.ml at gmail.com>
> > wrote:
> > > I have a Compaq V2000 laptop with the ATI IXP chipset and make use
> > the
> > > snd-atiixp module. The laptop needs to have the ac97_quirk option
> > to 7
> > > to enable the mute LED. After setting this option in the
> > > /etc/modprobe.d/options.conf file, the mute LED works after a
> > > However, after a resume from suspend or hibernate, the mute LED
> does not
> > > work. The alsa-info.sh script reports that the quirk is still set
> > 7.
> > > At this point a reboot will NOT fix the problem. The only way to
> fix it
> > is
> > > to remove and reinsert the module with modprobe.
> > >
> > > This is on a fresh Ubuntu 9.04 install. Any ideas? I wasn't sure
> > this
> > > should be reported here or on the kernel list. I saw a similar
> > with
> > > the ac97_quirk on the kernel list and they were referred here. I'm
> > > software developer, so I'd be willing to try ideas/possible
> solutions if
> > you
> > > have them.
> > Get the Ubuntu source code for the package that owns that ALSA
> > 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
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