SUMMARY After being "locked" for awhile, upon unlocking, one of my three displays will turn off, after blinking on and off (slowly) for a few seconds. It's usually the right-most display in my case, though it's *sometimes* the middle display. For a long time I thought it was hardware. I used to reboot whenever this happened, and cuss while it was booting, .... I have discovered though, that it can be restored quite easily (though it still causes some language :). * Launch Display Configuration (via desktop context menu). * In the "Drag screens to re-arrange them" area, select the offending display/screen * Uncheck the "Enabled" checkbox below, and hit "Apply". * Momentarily a small dialog asks you you if you want to "Keep" or "Restore" the setting. * Selecting "Restore" (or letting the time run out) will restore the setting, and put it back into a working state. STEPS TO REPRODUCE I don't know how to cause this to happen, but I see it every couple days, sometimes more than once in a day. I am certain some other developers out there (having 3 or more displays) have seen this issue. This may be the same on Wayland, but I've only seen it on X11, because I cannot run Wayland with Eclipse IDE (which I use for work) SOFTWARE/OS VERSIONS Operating System: KDE neon 6.2 KDE Plasma Version: 6.2.4 KDE Frameworks Version: 6.9.0 Qt Version: 6.8.1 Kernel Version: 6.8.0-51-generic (64-bit) Graphics Platform: X11 Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor Memory: 46.7 GiB of RAM Graphics Processor: AMD Radeon RX 6600 Manufacturer: ASUS
Some questions: 1. What's the make and model of the affected screen? 2. Is it always just this screen, even if you move it to a different position in the screen arrangement? 3. Can you try with Wayland anyway to see if the issue reproduces there? I'm not suggesting you use it full-time, just for testing purposes. 3a. What's the problem with Eclipse on Wayland? It should be able to run just fine using XWayland, no?
(In reply to Nate Graham from comment #1) > Some questions: > 1. What's the make and model of the affected screen? The screens are all ViewSonic VA2719-2K monitors (bought the same day because I am a bit OCD, they need to look and act the same :) > 2. Is it always just this screen, even if you move it to a different position in the screen arrangement? It's not always the same screen. Usually it's #3 (the right-most). About 10% of the time it's #2 > 3. Can you try with Wayland anyway to see if the issue reproduces there? I'm not suggesting you use it full-time, just for testing purposes. I will try > 3a. What's the problem with Eclipse on Wayland? It should be able to run just fine using XWayland, no? I will check out XWayland. If that fixes my Eclipse problem, I'm happy to run full-time on Wayland.
> 3. Can you try with Wayland anyway to see if the issue reproduces there? I got running on Wayland yesterday afternoon, and had no problems the rest of the day, into evening. After sleeping however, the problem occurred upon unlocking. Exactly as it does in X11. In this case display #2 (The middle one) went black immediately. As above, invoking Display Configuration, disabling the affected display and then restoring brought the display back on.
Might be an issue with identical displays that's being worked on.