Bug 495647 - GTK4 apps are super bright
Summary: GTK4 apps are super bright
Status: RESOLVED UPSTREAM
Alias: None
Product: kwin
Classification: Plasma
Component: colour-management (show other bugs)
Version: 6.2.2
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
: 499507 (view as bug list)
Depends on:
Blocks:
 
Reported: 2024-10-31 16:35 UTC by Oleg
Modified: 2025-02-05 13:53 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
HDR video (watch in mpv) (1.97 MB, video/webm)
2024-11-01 18:19 UTC, Oleg 		Details
kooha log with WAYLAND_DEBUG (190.88 KB, text/x-log)
2024-11-05 15:08 UTC, Oleg 		Details
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Description Oleg 2024-10-31 16:35:33 UTC 
SUMMARY
Some GTK4 apps (like Kooha) are super bright in KDE, and it seems like they're using HDR brightness for some reason even though they're not running with VK HDR layer.

STEPS TO REPRODUCE
1.  Open Kooha

OBSERVED RESULT
Interface will be super bright. No such problem on X11.

EXPECTED RESULT
Should be just like on X11.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.5-3-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700K CPU @ 4.20GHz
Memory: 15.6 ГиБ of RAM
Graphics Processor: AMD Radeon RX 6700 XT

ADDITIONAL INFORMATION
Some people reported similar issues with other GTK4 apps: https://www.reddit.com/r/kde/comments/1gg9kd8/has_anyone_noticed_gtk4_apps_look_kinda_saturated/
Comment 1 Nate Graham 2024-11-01 15:45:05 UTC 
Can you attach a screenshot of how it looks got you? It looks okay to me.
Comment 2 Oleg 2024-11-01 18:19:47 UTC 
Created attachment 175457 [details]
HDR video (watch in mpv)

I can't post a screenshot where it is clearly seen, but here's video with HDR metadata recorded (although colors are a bit wrong).
Comment 3 Nate Graham 2024-11-04 17:41:14 UTC 
Thanks!
Comment 4 Zamundaaa 2024-11-04 21:38:56 UTC 
Please attach the output of
> WAYLAND_DEBUG=1 kooha
Comment 5 Oleg 2024-11-05 15:08:40 UTC 
Created attachment 175552 [details]
kooha log with WAYLAND_DEBUG

Here it is
Comment 6 Oleg 2024-11-17 19:48:52 UTC 
Updating the status
Comment 7 Zamundaaa 2024-11-18 16:52:04 UTC 
Okay, GTK is using the BT2020+PQ here, so it's definitely a bug in GTK. FWIW I talked with GTK maintainers about this, and they now disabled using the color management protocol by default again in GTK because their implementation wasn't good enough yet... So this should go away with a future GTK update.
You can work around it with the environment variable GDK_DISABLE=color-mgmt for now
Comment 8 Vlad Zahorodnii 2025-02-05 13:53:00 UTC 
*** Bug 499507 has been marked as a duplicate of this bug. ***