[Bug 221827] New: Backlight regression with 7.1.6

[Bug 221827] New: Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

            Bug ID: 221827
           Summary: Backlight regression with 7.1.6
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: rjgolo@gmail.com
        Regression: No

Upon upgrading to 7.1.6, backlight at 100% is set to dimmest level.

cat /sys/class/backlight/amdgpu_bl2/*brightness

actual_brightness
brightness
max_brightness

100% or setting brightness same to max or less 1 than max - 7.1.6
0
65535
65535

98% - 7.1.6 - brightness restored
65290
64224
65535

100% - reverted 1191285ecb4233e5bf907da7e9394d7999055566 - ok
63576
62451
62451

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[Bug 221827] Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

Raymond Jay Golo (rjgolo@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Bisected commit-id|                            |1191285ecb4233e5bf907da7e93
                   |                            |94d7999055566
     Kernel Version|                            |6.1.7
         Regression|No                          |Yes

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[Bug 221827] Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@leemhuis.info) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mario.limonciello@amd.com,
                   |                            |regressions@leemhuis.info

--- Comment #1 from The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@leemhuis.info) ---
(In reply to Raymond Jay Golo from comment #0)
> Upon upgrading to 7.1.6, backlight at 100% is set to dimmest level.

@Mario, this is apparently caused by the following change of yours that was
backported to 7.1.y: f1b5d8f9cc54ae ("drm/amd/display: Fix backlight
max_brightness to match exported range") [v7.2-rc4, v7.1.6 (1191285ecb4233),
v6.18.42]

@Raymond: This might be a general problem or something specific to the
backport. Testing 7.2-rc6 or later is thus advised. You might also want to
attach dmesg files separately from a working and a broken kernel, as they most
likely will be helpful for debugging.

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[Bug 221827] Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

--- Comment #2 from Raymond Jay Golo (rjgolo@gmail.com) ---
(In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from
comment #1)
> (In reply to Raymond Jay Golo from comment #0)
> > Upon upgrading to 7.1.6, backlight at 100% is set to dimmest level.
> 
> @Mario, this is apparently caused by the following change of yours that was
> backported to 7.1.y: f1b5d8f9cc54ae ("drm/amd/display: Fix backlight
> max_brightness to match exported range") [v7.2-rc4, v7.1.6 (1191285ecb4233),
> v6.18.42]
> 
> @Raymond: This might be a general problem or something specific to the
> backport. Testing 7.2-rc6 or later is thus advised. You might also want to
> attach dmesg files separately from a working and a broken kernel, as they
> most likely will be helpful for debugging.

I'll try compiling next weekend as I currently use this laptop for work.

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[Bug 221827] Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |ANSWERED

--- Comment #3 from Artem S. Tashkinov (aros@gmx.com) ---
Please repost/report here:

https://gitlab.freedesktop.org/drm/amd/-/issues

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[Bug 221827] Backlight regression with 7.1.6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221827

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|6.1.7                       |7.1.6

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