Fwd: [Bug 217440] New: ALC236 audio disappears from HP 15z-fc000 on warm boot

["Joseph C. Sible" <josephcsible@gmail.com>]

Hello,

Forwarding my regression bug report submission per the instructions in
"Reporting regressions".

#regzbot introduced: 5aec989130
https://bugzilla.kernel.org/show_bug.cgi?id=217440

Regards,

Joseph C. Sible


---------- Forwarded message ---------
From: <bugzilla-daemon@kernel.org>
Date: Sat, May 13, 2023 at 3:46 PM
Subject: [Bug 217440] New: ALC236 audio disappears from HP 15z-fc000
on warm boot
To: <josephcsible@gmail.com>


https://bugzilla.kernel.org/show_bug.cgi?id=217440

            Bug ID: 217440
           Summary: ALC236 audio disappears from HP 15z-fc000 on warm boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.3.2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Sound(ALSA)
          Assignee: perex@perex.cz
          Reporter: josephcsible@gmail.com
        Regression: Yes
           Bisected 5aec98913095ed3b4424ed6c5fdeb6964e9734da
         commit-id:

On an HP 15z-fc000 laptop that uses Realtek ALC236 for sound, once the system
is warm booted ("reboot" from within Linux), sound stops working completely and
the device doesn't even show up anymore. Once this happens, the only way to get
it to come back is to cold boot ("poweroff" from within Linux, wait for it to
turn completely off, and turn it back on with the physical power button). In
particular, once you boot from a "bad" kernel, no number of warm boots with
"good" kernels will ever bring sound back.

I bisected this to commit 5aec989, which first appeared in 5.15-rc6. In
addition, I confirmed by doing a custom build of 6.3.2 with reverts of both
f30741c (just to avoid a conflict) and 5aec989, which works correctly for me.

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