RE: audio lost from speaker after reboot from windows on the device ALC295

[Kailang]

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@xxxxxxxxx>
> Sent: Thursday, July 4, 2019 8:02 PM
> To: Kailang <kailang@xxxxxxxxxxx>; alsa-devel@xxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Cc: perex@xxxxxxxx; tiwai@xxxxxxxx; jian-hong@xxxxxxxxxxxx;
> drake@xxxxxxxxxxxx; chiu@xxxxxxxxxxxx; hui.wang@xxxxxxxxxxxxx
> 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.