[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

            Bug ID: 107459
           Summary: Atomically set gamma ramps are not applied until TTY
                    switch
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: sir@cmpwn.com

When atomically setting gamma ramps on AMDGPU (specifically ), the changes
don't take effect until switching to another TTY and back again. Using the
legacy DRM interface works as expected.

To reproduce, build and run the rootston Wayland compositor:

https://github.com/swaywm/wlroots

We will shortly be merging this patch for a new gamma control protocol
extension, which you will need to apply if we haven't merged it by the time you
attempt it:

https://github.com/swaywm/wlroots/pull/1157

An sample program will be available in the build directory,
./examples/gamma-control, which can adjust gamma. By default this will use the
atomic interface, set WLR_DRM_NO_ATOMIC=1 before starting rootston to use the
legacy interface. Our atomic gamma code is here:

https://github.com/swaywm/wlroots/blob/master/backend/drm/atomic.c#L199-L230

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

--- Comment #1 from Drew DeVault <sir@cmpwn.com> ---
>When atomically setting gamma ramps on AMDGPU (specifically ), the changes don't take effect until switching to another TTY and back again. Using the legacy DRM interface works as expected.

Specifically the RX 550, that is.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding dmesg output.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

--- Comment #3 from Drew DeVault <sir@cmpwn.com> ---
Sorry for the delay. I did the following:

dmesg -n debug
# Reproduce problem
dmesg -n info
# Examine dmesg

There was nothing new written to the log.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
I mean just the output of dmesg without any arguments, to see various
information about the initialization of the driver and the kernel in general.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

--- Comment #5 from Drew DeVault <sir@cmpwn.com> ---
Created attachment 140977
  --> https://bugs.freedesktop.org/attachment.cgi?id=140977&action=edit
dmesg.log

Gotcha. Log attached.

Also, I spoke with a friend using the same GPU, they are able to reproduce the
issue.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #140977|text/x-log                  |text/plain
          mime type|                            |

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

--- Comment #6 from emersion <contact@emersion.fr> ---
sway users have reported this bug has been fixed in the latest kernel.

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[Bug 107459] Atomically set gamma ramps are not applied until TTY switch

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https://bugs.freedesktop.org/show_bug.cgi?id=107459

emersion <contact@emersion.fr> changed:

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

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