Bug 106578

Summary:	RedShift: xf86-video-amdgpu + amdgpu.dc=1 seems to apply gamma adjustment twice to the mouse cursor
Product:	xorg	Reporter:	tempel.julian
Component:	Driver/AMDgpu	Assignee:	xf86-video-ati maintainers <xorg-driver-ati>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	harry.wentland
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description tempel.julian 2018-05-19 13:10:34 UTC

When using xf86-video-amdgpu + amdgpu.dc=1 at the same time, enabling RedShift makes the mouse cursor appear too orange/dark. It looks like if the gamma adjustment is applied twice instead of once.

When using xf86-video-amdgpu + amdgpu.dc=0, the cursor looks correct (as orange as the rest of the screen).

When using amdgpu.dc=1 with modesetting DDX instead of xf86-video-amdgpu, the cursor looks correct as well.

(And for the sake of completeness: amdgpu.dc=0 without xf86-video-amdgpu leaves the mouse cursor completely untouched by RedShift.)

Best set your mouse cursor skin to something white, e.g. "DMZ White".

drm-next-4.18-wip (latest commit: 404af8e5236fe7eb64d91bf708bd7aa81815d14e) with Xorg 1.20 and xf86-video-amdgpu 18.0.1.

Comment 1 Michel Dänzer 2018-05-22 09:51:12 UTC

Harry, since when does DC apply the gamma LUT to the HW cursor as well? How can xf86-video-amdgpu check for this?

Comment 2 Michel Dänzer 2018-06-26 16:43:58 UTC

https://patchwork.freedesktop.org/patch/232244/ should fix this.

Comment 3 tempel.julian 2018-06-26 17:42:03 UTC

Thanks, I'll gladly try it out once this bug is fixed as well as I'll first have to install my RX 560 again:
https://bugs.freedesktop.org/show_bug.cgi?id=106175

Comment 4 Michel Dänzer 2018-07-04 14:16:24 UTC

Thanks for the report, should be fixed in Git master:

commit 8e98195e58f77fd1f354b2707360bd4445aef5b4
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Tue Jun 26 18:40:23 2018 +0200

    Don't apply gamma to HW cursor data if colour management is enabled

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