SUMMARY: After upgrading to Plasma 5.16 last night, the system has become sluggish and unresponsive. Any animation which includes a Fade or Blur seems to flicker whilst completing the animation, and the Blur created by Latte Dock, Konsole, and Menu bars is over saturated causing extremely dark backgrounds. Disabling Fading popups causes the animations of windows to be a little better, and the issue with the Background Blur only seems to occur if KVantum is used. Changing the window type from KVantum back to Breeze and rebooting seems to fix the Blur issues, but the animations are still extremely jagged and not smooth at all. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux with Plasma 5.16.0 running on 5.1.9.arch1-1 kernel (but kernel change makes no difference) using the built in modset drivers for Intel HD 620 Graphics. ADDITIONAL INFORMATION: - I've attempted to re-install the Plasma 5.16 packages, but this didn't change anything. I've also cleared the .cache folder, but this also did not fix the fault.
Same symptoms here. But with up to date KDE Neon user edition and a nVidia 1070Ti. Same behaviour with or without the triple buffering tweaks.
Created attachment 120876 [details] Konsole & Blur System Settings windows over pure black I have also been having some graphical problems after updating to Plasma 5.16. I have an RTX 2080 using nvidia driver 430.26. The main thing I have been noticing is the noise for the blur is messed up. On Plasma 5.15 I had the Noise strength set to about 6/15. Now on Plasma 5.16 it is set at 3/15 and the noise is more visible than it was at 6/15 on Plasma 5.15. Setting it to 2/15 seems to have removed the noise entirely. I have attached an image of Konsole over a pure black SVG image and the Blur system settings window. This is set to 3/15, as it is shown in the image. I am having a difficult time determining the root cause of the issue. I don't think it is a nvidia driver issue as it was working fine on Plasma 5.15 with nvidia driver 430.26.
Sorry it was set half way in the attachment. I uploaded the wrong image.
Created attachment 120878 [details] Konsole & Blur System Settings windows over pure black This is with the noise at 3/15.
If that can help, I have slight improvements with these settings : KDE opts : Compositor, vsync set to auto with opengl 2.0. Precise scaling method Nvidia panel : Sync to vblank checked. Allow flipping, Use conformant texture clamping deactivated. Removed triple buffering tweak in /etc/profile and in xorg (deleted the 20-nvidia.conf file with the triple buffering setting activated before). That was very useful to prevent tearing pre 5.16 The results are : Way less stuttering : It is only present when the CPU is working hard at the same time No more flickering in OBS Desktop effects are smoother, but not at the same level than with a intel IGPU. To get rid of the bizarre blur, I set the blur noise to the minimum. I have now the blur like pre 5.16
(In reply to Tommy Beauclair from comment #5) > If that can help, I have slight improvements with these settings : > > KDE opts : Compositor, vsync set to auto with opengl 2.0. Precise scaling > method > > Nvidia panel : Sync to vblank checked. Allow flipping, Use conformant > texture clamping deactivated. > > Removed triple buffering tweak in /etc/profile and in xorg (deleted the > 20-nvidia.conf file with the triple buffering setting activated before). > That was very useful to prevent tearing pre 5.16 > > The results are : > > Way less stuttering : It is only present when the CPU is working hard at the > same time > > No more flickering in OBS > > Desktop effects are smoother, but not at the same level than with a intel > IGPU. > > To get rid of the bizarre blur, I set the blur noise to the minimum. I have > now the blur like pre 5.16 I can confirm that even on Intel GPU setting it to OpenGL 2.0 with Accurate scaling method, the stuttering is a lot less, but anything that opens with a Fade effect seems to stutter when opening, flickering the image. To me it is like it is having issues rendering.I have attached a screenshot for this also.
Created attachment 120888 [details] KDE Working Settings _ Intel GPU This image is of the current settings i have that minimize the stutter / flicker, although it is not perfect.
Created attachment 120899 [details] Blur Noise Levels Maybe my issue should be split from this one. As I have no tearing or slow down to speak of. The only issue I have is the broken noise. Level 2 looks exactly like level 1, but it's brighter. There is no noise on level 1 or 2, on level 3 there is noise but it doesn't look correct. If the background is light it looks fine. But when the background is dark, it looks very noisy and stands out a lot. I also noticed that the corners of the windows do not always appear rounded like they should. I have attached an image that should clearly show what I am talking about.
Wanting to add the following: I believe that the issue may be with xrandr possibly, as I cam getting some random crashes now where my external displays flicker. I definitely agree that the Blur noise levels seem separate to this bug. This bug is specifically for "Fade" based effects flickering / stuttering during their animations.
Way less stuttering and no tearing with this setting (nvidia card) vblank in kwin settings set to automatic nvidia panel : sync to vblank deactivated, allow flipping activated
Please confirm if this is still an issue on 5.27
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!