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
