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SubjectRE: audio lost from speaker after reboot from windows on the device ALC295
Date
Sorry!!
Forgot attach file.

> -----Original Message-----
> From: Kailang
> Sent: Friday, July 5, 2019 10:41 AM
> To: 'He, Bo' <bo.he@intel.com>; alsa-devel@alsa-project.org;
> linux-kernel@vger.kernel.org
> Cc: perex@perex.cz; tiwai@suse.com; jian-hong@endlessm.com;
> drake@endlessm.com; chiu@endlessm.com; hui.wang@canonical.com
> Subject: RE: audio lost from speaker after reboot from windows on the device
> ALC295
>
> Hi Bo He,
>
> Could you help to dump info for us?
> Please use attach file to get results.
>
> ./alsa-info.sh --no-upload
>
> You will find dump file in folder /tmp/alsa-info.txt-????????.
>
> Please run one time in normal state and one time in fail state.
> Please send two result files to me.
>
> BR,
> Kailang
>
> > -----Original Message-----
> > From: He, Bo <bo.he@intel.com>
> > Sent: Thursday, July 4, 2019 8:02 PM
> > To: Kailang <kailang@realtek.com>; alsa-devel@alsa-project.org;
> > linux-kernel@vger.kernel.org
> > Cc: perex@perex.cz; tiwai@suse.com; jian-hong@endlessm.com;
> > drake@endlessm.com; chiu@endlessm.com; hui.wang@canonical.com
> > Subject: audio lost from speaker after reboot from windows on the
> > device
> > ALC295
> >
> > Hi, patch_realtek.c maintainer:
> > I see one issue that reboot from windows and boot to ubuntu, the
> > audio lost from speaker, I suspect there are some bugs in
> > patch_realtek.c drivers, the device is ALC295 and the device id is
> 0x10ec0295.
> >
> > I have done the below experiments:
> > 1. reboot from windows to windows, the audio is persist .
> > 2. reboot from windows to ubuntu, the audio lost from speaker, but can
> > hear if I hotplug one earphone.
> > 3. if the issue reproduce after reboot from windows, reboot the ubuntu
> > can't restore the audio, I suspect it's warm reset.
> > 4. if I write the port 0xcf9 with 0xe to do cold reset, the audio can restore.
> > 5. if I do suspend/resume, the audio can restore, I suspect do cold
> > boot and suspend will trigger the platform reset to reset the ALC295.
> > 6. if I do double function reset (write the verb 0x7ff in alc_init),
> > the audio is still can't restore.
> > snd_hda_codec_write(codec, 0x01, 0, AC_VERB_SET_CODEC_RESET, 0); /*
> > Function reset */ snd_hda_codec_write(codec, 0x01, 0,
> > AC_VERB_SET_CODEC_RESET, 0); /* double Function reset */ 7. the issue
> > is first found on kernel 4.19.50, I still see the issue with the
> > latest kernel 5.2-rc2, is it possible windows change some default
> > registers, but ALC295 don't initialize the register?
> >
> > ------Please consider the environment before printing this e-mail.
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