https://bugs.kde.org/show_bug.cgi?id=440361

--- Comment #17 from Zamundaaa <xaver.h...@gmail.com> ---
> ~/.local/share/sddm/wayland-session.log is empty on my system. Any idea why 
> or where the log is instead?

You're using the systemd boot, probably because Fedora does that by default.
Try "journalctl --user | grep kwin_wayland_drm"

> "GAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 262145
> "DEGAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 33

That's a big and a very small LUT table. Too big and too small respectively. I
am fairly certain this is the cause of the bug, those values don't make sense.

> I tested a Weston session and it works fine, so probably not a driver bug.

Unfortunately that doesn't seem to do the trick. I had a suspicion that Weston
only uses legacy functions (which we do with KWIN_DRM_NO_AMS set, too) to set
gamma, but it turns out that it doesn't set gamma at all. Could you try another
wayland compositor that does set gamma? A live usb with the latest GNOME or
Sway should do it.

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