| Summary: | After DDC-capable monitors become dimmed, moving the mouse raises them all to a single brightness value, not the brightness they had before being dimmed | ||
|---|---|---|---|
| Product: | [Plasma] Powerdevil | Reporter: | Konstantin <jon9097> |
| Component: | general | Assignee: | Plasma Bugs List <plasma-bugs> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | ben, hu.repasidavid, jpetso, natalie_clarius, nate, poscat0x04 |
| Priority: | NOR | ||
| Version: | 5.27.9 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/plasma/powerdevil/-/commit/95ee5f6b045579ade741a0f0f81f1446102262a4 | Version Fixed In: | 6.2.1 |
| Sentry Crash Report: | |||
| Attachments: | Scr | ||
Am I understanding you correctly that your issue is that after waking up from dimming, the brightness that was set previously is not correctly remembered for each monitor individually? (In reply to Natalie Clarius from comment #1) > Am I understanding you correctly that your issue is that after waking up > from dimming, the brightness that was set previously is not correctly > remembered for each monitor individually? That's right, after the brightness is restored, the same brightness is set on all monitors. (In reply to Natalie Clarius from comment #1) > Am I understanding you correctly that your issue is that after waking up > from dimming, the brightness that was set previously is not correctly > remembered for each monitor individually? I have 3 monitor monitors: Acer VG270U (Main) Acer VG240Y LG 2243 I set the brightness I need on each monitor separately, but after automatically reducing the brightness when I move the mouse (or do something else), the same brightness is set on all monitors. Although at first it is different. Can reproduce on Fedora 40 KDE spin, with Philips 279c9 monitor. If I wake KDE up immediately after the screen has completely dimmed, the brightness level seems to be able to restore to the original value. If I wait too long then the resulting brightness is significantly lower than the original. My hypothesis is that this is caused by the DDC signal sent too early by KDE, when the display wasn't even prepared to receive and to react to such signal. System Info: Operating System: Fedora Linux 40 KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.2.0 Qt Version: 6.7.0 Kernel Version: 6.8.9-300.fc40.x86_64 (64-bit) Graphics Platform: Wayland Processors: 20 × 12th Gen Intel® Core™ i7-12700 Memory: 31.1 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics 770 Manufacturer: ASUS A possibly relevant merge request was started @ https://invent.kde.org/plasma/powerdevil/-/merge_requests/360 So as far as I understand, there are different parts to this issue: 1. The user changes monitor brightness via monitor OSD, also because Plasma doesn't provide per-display controls at the moment. DDC/CI doesn't tell us that a change was made, that's not part of the protocol. PowerDevil would have to read each monitor's current brightness manually before initially dimming, so we know what values to return to. This is essentially Bug 411050 comment #10, and not straightforward to fix. Setting brightness via Plasma brightness controls, or setting brightness before PowerDevil starts (i.e. before login), would be a workaround to not keeping up to date on the latest brightness values. 2. The current brightness setter API only takes a single brightness value, and that value is not adjusted for different monitors. I opened this MR to sidestep this legacy brightness setter API and instead control dimming with a brightness multiplier: https://invent.kde.org/plasma/powerdevil/-/merge_requests/360 3. There's also an issue in setBrightness() in that it doesn't adjust its single value to the different possible maximum brightness values of each monitor that's getting changed. I have a patch to fix that as well, no MR yet, but that's less important here because we're sidestepping setBrightness() anyway as per the previous point. There seems to be progress on this issue, I just wanted to share that I have it as well. I only have one monitor, and when moving the mouse in the dimmed state it stays with that value of 27(?). System Info: Operating System: Arch Linux KDE Plasma Version: 6.0.5 KDE Frameworks Version: 6.2.0 Qt Version: 6.7.1 Kernel Version: 6.9.3-arch1-1 (64-bit) Graphics Platform: Wayland Monitor: S22F350FHU Also, just as a question, is this related: https://bugs.kde.org/show_bug.cgi?id=470664? Hi, I just went through the bug list again and realized that my earlier change for Plasma 6.2.1 would be the fix for this issue: https://invent.kde.org/plasma/powerdevil/-/merge_requests/433 Plasma 6.2.1 now has per-screen brightness controls, and will restore each monitor's brightness to the value it had configured before dimming. As long as Plasma (i.e. PowerDevil) is aware of the last configured brightness value - there is some more work to be done especially in Wayland sessions (i.e. with KWin brightness integration) to read from monitor brightness values, and not just set them to the brightness slider value in the "Brightness & Color" applet. But that's a different issue (Bug 495109, among possibly others), and I think it makes sense to mark this one as resolved. |
Created attachment 162860 [details] Scr The screen dimming function does not work properly. I have 3 monitors and after the brightness of the monitor decreases, if I move the mouse, the same brightness is set on all monitors. Simply put, the brightness settings of the monitors are lost to a single value. I have 27 brightness on the first monitor, 27 on the second, and 100 on the third. The "Screen Fading" mode is turned on and when you exit it, the brightness of all monitors becomes 27. Operating System: Arch Linux KDE Plasma Version: 5.27.9 KDE Frameworks Version: 5.111.0 Qt Version: 5.15.11 Kernel Version: 6.5.9-zen2-1-zen (64-bit) Graphics Platform: Wayland Processors: 16 × Intel® Core™ i7-10700K CPU @ 3.80GHz Memory: 62.7 ГиБ of RAM Graphics Processor: NVIDIA GeForce RTX 4080/PCIe/SSE2 Manufacturer: Micro-Star International Co., Ltd. Product Name: MS-7C80 System Version: 1.0