On Mon, 12 May 2025 16:56:17 +0200, Ruslan Nikolaev wrote:
Hi,
Forwarding my regression bug report for HP 15-fc000 / ALC236 (ALC256 code path).
#regzbot introduced: v6.12.2 https://bugzilla.kernel.org/show_bug.cgi?id=220109
Sincerely, Ruslan
Forwarded Message (see logs in the bug report above):
There was a similar bug in the past (Bug 217440), which was fixed for this laptop. (I believe the code path is for ALC256, see below.) The same issue is occurring again as of kernel v.6.12.2. The symptoms are very similar - initially audio works but after a warm reboot, the audio completely disappears until the computer is powered off (there is no audio output at all).
The issue is caused by a different change now. By bisecting different kernel versions, I found that reverting cc3d0b5dd989d3238d456f9fd385946379a9c13d in patch_realtek.c ( see https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/soun... ) restores the sound and it works fine after the reboot.
It's the commit cc3d0b5dd989d3238d456f9fd385946379a9c13d Author: Kailang Yang kailang@realtek.com Date: Thu Nov 14 15:21:09 2024 +0800
ALSA: hda/realtek: Update ALC256 depop procedure
Old procedure has a chance to meet Headphone no output.
Fixes: 4a219ef8f370 ("ALSA: hda/realtek - Add ALC256 HP depop function") Signed-off-by: Kailang Yang kailang@realtek.com Link: https://lore.kernel.org/463c5f93715d4714967041a0a8cec28e@realtek.com Signed-off-by: Takashi Iwai tiwai@suse.de
and it modified alc256_init() sequence.
Kailang, could you check this regression?
And, Ruslan, it's the case without the headphone, right? Is the sound still lost when you connect the headphone and apply the same procedure?
thanks,
Takashi