Re: [RX470 - polaris10] Wrong window titlebar gradient after kernel update 7.1 to 7.2

["Stefan Kühn" <familiekuehn@posteo.de>]

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Hello,

thanks for your reply.

I created an issue in the gitlab.

https://gitlab.freedesktop.org/drm/amd/-/work_items/5755


Greetings
Stefan Kühn


Am 02.09.26 um 16:59 schrieb Thorsten Leemhuis:
> On 8/31/26 22:12, Stefan Kühn wrote:
>> recently I updated from a self compiled Linux 7.1(.8) to 7.2(.0) and
>> spotted a possible regression in the amdgpu driver.
> 
> Thx for the report. There is still a chance that someone might help your
> here, but unless that happens soon I suggest you submit this to the
> central place for amdgpu bug report, which is
> https://gitlab.freedesktop.org/drm/amd/-/work_items/ -- ideally after
> checking for existing reports there. Afterwards please drop a link to
> the report here in a reply.
> 
> Ciao, Thorsten
> 
>> [HARDWARE/SOFTWARE INFO]
>>
>> Operating System: KDE neon
>> KDE Plasma Version: 6.7.4
>> KDE Frameworks Version: 6.29.0
>> Qt Version: 6.11.1
>> Kernel Version: 7.2.0-va2635 (64-bit)
>> Graphics Platform: Wayland
>> OpenGL version: 4.6
>> GLSL version: 4.60
>> Mesa version: 25.2.8
>> X server version: 1.24.1
>>
>> Processors: 4 × Intel® Core™ i5-4590 CPU @ 3.30GHz
>> Memory: 15.6 GiB of usable RAM
>> Graphics Processor: AMD Radeon RX 470 Graphics
>> Manufacturer: ASUS
>> Product Name: All Series
>>
>> 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
>> [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
>> [1002:67df] (rev cf)
>>
>>
>> [WHAT HAS HAPPENED]
>>
>> On my KDE desktop I can see the window titlebar gradient is now wrong.
>> The theme is "breeze bright" and instead of a smooth white to light gray
>> transition there is a hard cut. It looks like bright tones are clipped
>> too early to white. And in the opposite (when I check with a gradient
>> graphix in GIMP) dark tones are too early cut to black. It reminds me of
>> limited color space where you do not have the full 0-255 range for
>> brightness.
>>
>> A screenshot from the titlebar viewed on another machine looks fine.
>>
>>
>> [WHAT I HAVE DONE]
>>
>> I collected some files with debug output from the kernel's debugfs, its
>> dmesg and from modetest. For version 7.1 and 7.2, the latter was
>> compiled with "make oldconfig".
>>
>> The display is connected with HDMI (HDMI-A-2). DVI is unaffected.
>>
>>
>> [FOUND WORKAROUND]
>>
>> Using DVI cable OR changing "kwinoutputconfig.json". The property
>> "rgbRange" from "Automatic" to "Limited". On Linux 7.2 the gradient is
>> fine again. On Linux 7.1 both options are okay. Which I find strange?
>> Should "Limited" on 7.1 not be "broken on purpose"?
>>
>>
>> [AI OPINION]
>>
>> For completeness: I can made the OpenAI chat available. It points to the
>> "HDMI state" and wants me to check "broadcast_rgb -> output_color_space
>> -> qs_bit -> Q0_Q1".
>>
>>
>> Please let me know if I can be of any further help.
>>
>>
>> Regards
>> Stefan Kühn
> 


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