SUMMARY *** Bottom and right rim bright / stuck pixels when logging in on KDE neon 6.0.0|2 (i.e. bright line at bottom, bright column at the right - all being stuck pixels - i.e. coulourful) - see screen shot: https://jmb-edu.de/images/screenshot_of_KDE_neon_6_0_2_wayland_with_ill_bottom_and_right_rims_of_stuck_pixels.gif [It is 6734 kB, so larger than allowed attachment - but via Browser no problem ...] It was not existing with other OS - older KDE up to at least 5.27.10 - but emerged with update to KDE 6.0.0 (1st time Wayland - so could be kwin ??? related) on installation of KDE neon [based on Ubuntu 22.04 LTS]. The login screen does not show this pattern but directly after loging in, this pattern is present. *** STEPS TO REPRODUCE 1. Using KDE neon updated to KDE 6 2. Logging in 3. bright rims are visible (at least on my HW, see below) OBSERVED RESULT bright rims to the right and bottom EXPECTED RESULT normal display SOFTWARE/OS VERSIONS KDE neon (User edition) with complete update, i.e. current. ADDITIONAL INFORMATION CPU: AMD Ryzen 5 3600 GPU: AMD Radeon RX 5700 XT Motherboard: ASUS ROG Strix X570-E Gaming Screen: BenQ EW3270U 4k screen => This is common HW and the best supported HW under Linux (gaming versions are chosen for better compatibility - like motherboard). I am a former Unix specialist - so if you need futher details, just ask with some explanation what to do / send to you for clarification. E-Mail: jmb_tux@gmx.net Thanks for your good job!
Hi - would you mind confirming if this is still happening with all the latest updates? Also do you have any display scaling applied? Thanks, Nick.
I have just updated KDE neon (a lot KDE programs [KDE Gear 24.02.1] - but KDE was on 6.0.2 - with 6.0.3 not yet available). After reboot the problem is still there. --- But you gave the hint on my other bug with session restore that this is Wayland related - and so are my graphic errors after switching to X11 ... the graphic errors are gone - so are Wayland related - which means it does not work with RX 5700 XT / RDNA1 / Navi10 correctly. But on X11 session, everything is ok graphics related. So KDE seems to have trouble with Wayland - concerning graphics mode and session restart. Additionally, the scaling was not changed when switching sessions - but Wayland and X11 are totally different (on X11, konsole windows are much larger) - so both have not the same behaviour under KDE. From my point of view this is a third Wayland related bug with KDE. I am happy I can start configuring and working under X11 with KDE6 ... so the big problem is Wayland here. Mabe it would have been better to leave the default with X11 session. KDE neon was switched to Wayland with KDE 6.0.0 update - nice to get Wayland bug reports ... not so nice for users, though ... Thanks for the help and hinting to session type ... and I hope the problems with Wayland will be addressed. Should I have to create new bug reports - or can this be pointed to the right category: I think KDE and Wayland are not yet ready for prime time and Wayland and X11 should behave and look the same under KDE ... and one should support X11 (concerning KDE neon) till the bugs have been fixed ... may be heavy lifting if Wayland should be the default for KDE neon based on 24.04.1 LTS ... but maybe this can be fixed faster. I am willing to test if KDE Wayland got better - as I will clone OS partition after I have configered everything right and can test it with the old clone image and working with the new one.
Sorry, I used display scaling - but if I remember correctly, the graphics problem was there before I used scaling. Can check, if this would be of improtance.
Thanks for the feedback - if you can confirm your scaling settings that would be useful. If they are anything other than 100%, would you mind re-testing on Wayland with 100% scaling and report whether you still see the problem? I want to see whether this is only caused when you have scaling and Wayland. Thanks.
Ok, I checked and with 100% scaling there is no graphics problem visible with Wayland session - as you guessed. I used 155% (ok for konsole windows) and with this under Wayland session the graphics problem is clearly visible. So a combination of scaling and Wayland session triggers this at least on my HW (as given before: AMD Radeon RX 5700 XT / RDNA1 / Navi10).
Possible duplicate of https://bugs.kde.org/show_bug.cgi?id=481219 I wonder if anyone can confirm? *** This bug has been marked as a duplicate of bug 481219 ***
I can clearly say that those bug reports are not related. My bug report is about the Wayland display after log in which is disturbed by a right column and a bottom line with stuck pixels; so it is bright in contrast of the black rim but shows differen colors and is related with wrong usage of graphics card (AFAICS). It looks as if the HW (graphics card) could be harmed - and is really annoying. The other bug report shows System Settings - Wallpaper (i.e. showing wallpaper pictures for sellection) - and the bright column to the left of the picture is calculated by the left column of the respective wallpaper picture (just zoomed in to this bright column) - to produce a 3d like effect (I guess) - which looks nice ... So this seems to have changed ... but does not look bad or broken in any way. But this is just my impression (I worked in Unix business and had been responsible for CAD Workstations - not too familiar with KDE GUI changes - and I have not looked into current wallpaper selection via system settings, though). But a responsible developer should clearly say if something was done this way as stylish means.
Removing duplicate.
Many thanks for all the data provided so far. I've got as far as I can with trying to triage this one - hoping others reading this might be able to take it further and ideally duplicate the symptoms. Thanks.
*** This bug has been marked as a duplicate of bug 482987 ***