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. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
