| Summary: | Monitor brightness resets to 100% on every monitor wakeup | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Tomi <steampipe93> |
| Component: | output configuration | Assignee: | Jakob Petsovits <jpetso> |
| Status: | ASSIGNED --- | ||
| Severity: | normal | CC: | germanp82, jpetso, kde, kdebugs, natalie_clarius, nate, post+kdebugs, postix, swmcd, xaver.hugl |
| Priority: | NOR | ||
| Version: | 6.2.0 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| See Also: | https://bugs.kde.org/show_bug.cgi?id=494497 | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
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Description
Tomi
2024-10-10 11:14:05 UTC
Managed to fix this issue by installing power-profiles-daemon from arch repo since it was missing from original plasma install now i can change brightness from taskbar. Still it might be better to let users decide between changing monitor brightness from plasma itself or monitor osd. So adding option in monitor configuration page would be ideal in my opinion Did you not have powerdevil installed as well? I can't see how installing only power-profiles-daemon would have resolved this. apparently i didnt have it installed i guess. When i installed arch i installed plasma-meta package but it still was missing power-profiles-daemon. My kde plasma basically let me know i was missing that package when i did some digging. After i installed that package i can set my monitor brightness from taskbar "brightness and color". I guess it defaulted to 100% when i was missing that package so it got resolved that way KWin defaults the brightness of every monitor to 100% and that's a bug that I can confirm. It happens on session startup, monitor wake-up, and possibly other KWin output configuration change events, until the default brightness is changed. I have seen reports of this on Reddit and Lemmy. To reproduce: * Log out of Plasma * Delete the "brightness" property from your monitor entry in .config/kwinoutputconfig.json * Manually reduce hardware brightness for your display * Start a new Plasma Wayland session. KWin will ask PowerDevil to max out the brightness for any display without this entry, even if hardware brightness is currently lower than max. The power-profile-daemon installation seems like a red herring, because monitor brightness controls should be available with just PowerDevil by itself. (Without PowerDevil, hardware screen brightness would not be raised.) But the point is that the user needs to change the brightness default to get back to their previously configured monitor brightness, and they shouldn't have to do that. The bad news is that a fix will require an addition to plasma-wayland-protocols, plus matching patches in PowerDevil (to announce the initial monitor brightness) and KWin (to use it if it was announced). While I know that this can be done in a backwards-compatible way, I'm not sure if the existing guidelines around Wayland protocol versioning will allow me to make it so that PowerDevil will keep working with KWin from 6.2.0. That's a discussion topic for the merge review though. I don't think this can be solved nicely... if your monitor resets its brightness on power off (which some do!), you really want KWin to ignore what it says. Can we somehow detect that the user actually used the OSD to change the brightness level? Or detect that the OSD is open when the brightness gets changed, and only accept the change then? (In reply to Zamundaaa from comment #5) > Can we somehow detect that the user actually used the OSD to change the > brightness level? Or detect that the OSD is open when the brightness gets > changed, and only accept the change then? No. The best we can do is poll the monitor semi-regularly (perhaps every 30 seconds) and assume that any observed changes during the KWin session, while the monitor is on, were intentional. That's what the externalBrightnessChangeObserved signal within PowerDevil is meant to do, minus the polling part which is not currently being done for DDC/CI devices (but could be added). I see this as well on ArchLinux without power-profiles-daemon. powerdevil is installed in version 6.2.0. I did not have this problem before version 6.2.0. Now I can set on my monitor's OSD whatever value I want, as soon as the dimming timeout configured in KDE's power saving settings is reached, or after wakeup from suspend, the monitor's brightness is always set to 100%, which hurts my eyes (just as with the OP). This only happens on my external monitor (BenQ PD2700U-B), which I use with my laptop's lid closed in a vertical stand (“clamshell” style). Monitor brightness resets to 100% on every monitor wake-up. Software KDE Plasma Version: 6.2.0 KDE Frameworks Version: 6.7.0 Qt Version 6.7.2 Kernel Version 6.10.12-300.fc40.x84_64 (64-bit) Graphics Platform: Wayland Hardware Processors: 4 x Intel Core i5-4590 CPU @3.30GZ Memory 7.6 GiB RAM Graphics Processor: Mesa Intel HD Graphics 4600 Manufacturere: ASUS I upgraded to the latest KDE yesterday. The previous KDE version behaved a bit differently: on every monitor wake-up, the brightness reverted to the value that it had at the last system boot. Huh...I did a few reboots and a factory reset of the monitor (Dell U3023E) and the problem seems to have gone away. If using external monitor, workaround is to disable DCC/CI on monitor OSD. I found that on both my Dell S2721DGF and my BenQ GW2480 that disabling DDC/CI worked for me. I don't like controlling my monitors via software anyways (except for some color correction), so that was the fix that works best for me. Might not be the best solution for those who like controlling their monitor's settings via software or who have no choice but control them via software (laptops being the primary example). Don't know if laptops are affected by this bug, but something worth pointing out. A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6667 |