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Kailang Yang b345e06f2d ALSA: hda/realtek: Audio disappears on HP 15-fc000 after warm boot again [ Upstream commit `f4b3cef55f` ] There was a similar bug in the past (Bug 217440), which was fixed for this laptop. 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 also related by caused by a different change now. By bisecting different kernel versions, I found that reverting `cc3d0b5dd9` in patch_realtek.c[] restores the sound and it works fine after the reboot. [] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/sound/pci/hda/patch_realtek.c?h=v6.12.2&id=4ed7f16070a8475c088ff423b2eb11ba15eb89b6 [ patch description reformatted by tiwai ] Fixes: `cc3d0b5dd9` ("ALSA: hda/realtek: Update ALC256 depop procedure") Link: https://bugzilla.kernel.org/show_bug.cgi?id=220109 Signed-off-by: Kailang Yang <kailang@realtek.com> Link: https://lore.kernel.org/5317ca723c82447a938414fcca85cbf5@realtek.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-12-07 06:09:25 +09:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.