SUMMARY Display brightness slider in applet available but has no effect. Journalctl logs when moving the slider: ``` org_kde_powerdevil dh=DISPLAY_Handle[i2c-0: fd=24], Replacing adjusted sleep multiplier 0,10 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS. ``` The monitor is a iiyama ProLite XUB2792HSU SOFTWARE/OS VERSIONS Operating System: Fedora Linux 40 KDE Plasma Version: 6.0.3 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 Kernel Version: 6.8.7-300.fc40.x86_64 (64-bit) Graphics Platform: Wayland
Created attachment 168894 [details] ddcutil interrogate output Please find the `ddcutil interrogate` output attached for further investigation. The display is currently connected via an HDMI cable. Unfortunately in the moment I don't have a DP cable at hand for testing.
Does it still happen in Plasma 6.1.3 or later?
Can check in a few weeks again.
Logged in remotely with Wireguard + krdc, upgraded, rebooted and tested: Nope, still broken unfortunately!
When you adjust the slider and it does nothing, does `kscreen-doctor -o` say that the monitor's brightness is at the level you specified?
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There's no info about any brightness: ``` kscreen-doctor -o Output: 1 HDMI-A-1 enabled connected priority 1 HDMI Modes: 0:1920x1080@60*! 1:1920x1080@75 2:1920x1080@60 3:1920x1080@60 4:1920x1080@50 5:1600x1200@60 6:1680x1050@60 7:1280x1024@75 8:1280x1024@60 9:1440x900@75 10:1440x900@60 11:1280x960@60 12:1280x800@60 13:1152x864@75 14:1280x720@60 15:1280x720@60 16:1280x720@60 17:1280x720@50 18:1152x720@60 19:1024x768@75 20:1024x768@60 21:832x624@75 22:800x600@75 23:800x600@60 24:720x576@50 25:720x576@50 26:720x480@60 27:720x480@60 28:720x480@60 29:720x480@60 30:640x480@75 31:640x480@60 32:640x480@60 33:640x480@60 34:720x400@70 35:1280x1024@60 36:1024x768@60 37:1280x800@60 38:1920x1080@60 39:1600x900@60 40:1368x768@60 41:1280x720@60 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown HDR: incapable Wide Color Gamut: incapable ICC profile: none Color profile source: sRGB ``` journalctl ``` org_kde_powerdevil[6220]: dh=Display_Handle[i2c-0: fd=31], Replacing adjusted sleep multiplier 0,50 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS ```
Ok, so KWin correctly thinks you don't have monitor brightness control, but Powerdevil disagrees.
The issue remains now on Fedora 41 with Plasma 6.2.2, but there's now no longer any log output when moving the slider, neither in journalctl nor in dmesg. Could it be detected that brightness changing doesn't work with powerdevil and fallback to a software overlay? If not, could an option be added? The broken state right now, is a bit unfortunate. :)
Additionally resolving bug #495248 would also enhance the UX in this regard.
I've tested it again with Operating System: Fedora Linux 41 KDE Plasma Version: 6.2.3 KDE Frameworks Version: 6.8.0 Qt Version: 6.8.0 Kernel Version: 6.11.7-300.fc41.x86_64 (64-bit) Graphics Platform: Wayland now with both HDMI and DP cable there's no brightness change but on slider release it logs ``` rg_kde_powerdevil[2978]: dh=Display_Handle[i2c-3: fd=32], Replacing adjusted sleep multiplier 0,10 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS ```
*** Bug 489397 has been marked as a duplicate of this bug. ***