[Bug 203525] New: brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[Bug 203525] New: brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

            Bug ID: 203525
           Summary: brightness with function buttons Acer Aspire A315-41
                    notebook with AMD Ryzen 5 2500U
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19.37 5.0.11 5.1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: erikjohansson@flashbox.5july.org
        Regression: No

I got an Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U and i have had
problems with brightness not working out of the box (OTB) if i used function
buttons.
The thing is that i found that it started to work with linux-4.19.37 (fixed)
but it didn't work with linux-4.19.35 (broken).

It works from 4.19.37 but it doesn't work in later kernel series such as
linux-5.0.11 or linux-5.1 and i think the fix should also be in newer kernels.
I started to bisect but linux-4.19.36 doesn't boot with my hardware and after
many bisect skip and compiling i gave up.
Do anyone know what commit that could have fixed it?
Or why 4.19.36 won't boot on my hardware (if there was some known regression)
so i can perform an bisect.

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Can you attach your dmesg outputs for both the working kernels and non-working
kernels?

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #2 from Erik (erikjohansson@flashbox.5july.org) ---
Created attachment 282647
  --> https://bugzilla.kernel.org/attachment.cgi?id=282647&action=edit
dmesg fixed 4.19.39

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #3 from Erik (erikjohansson@flashbox.5july.org) ---
Created attachment 282649
  --> https://bugzilla.kernel.org/attachment.cgi?id=282649&action=edit
dmesg broken 4.19.35

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #4 from Erik (erikjohansson@flashbox.5july.org) ---
Created attachment 282653
  --> https://bugzilla.kernel.org/attachment.cgi?id=282653&action=edit
dmesg fixed 4.19.37

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #5 from Erik (erikjohansson@flashbox.5july.org) ---
By adding commit b59dfdaef173677b0b7e10f375226c0a1114fd20 i was able to boot
4.19.36.
I tried 4.19.36 but it was broken.
4.19.36 broken and 4.19.37 fixed.
I then ran a bisect but i wasn't able to to find the commit that fixed it.
I don't know why the bisect went thru all steps without finding the fix.

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #6 from Erik (erikjohansson@flashbox.5july.org) ---
The bisect was working i only didn't trust it.
What causes the change in behavior wasn't caused by resent fixes, well it was
but it wasn't.
What makes it work is bumping SUBLEVEL above 36.
I tried bumping SUBLEVEL of 5.1 and 5.1.36 was broken while 5.1.37 was working.

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

--- Comment #7 from Erik (erikjohansson@flashbox.5july.org) ---
Is there anything more i can do to find out what's going on?

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[Bug 203525] brightness with function buttons Acer Aspire A315-41 notebook with AMD Ryzen 5 2500U

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203525

Erik (erikjohansson@flashbox.5july.org) changed:

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

--- Comment #8 from Erik (erikjohansson@flashbox.5july.org) ---
Since "echo 100 > /sys/class/backlight/amdgpu_bl0/brightness" works it's not a
kernel problem but rather userspace.

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