Following Plasma /KDE updates today (11-16-15) Plasma desktop has slowed to a treacle. Have tried rebooting and deleting cache to no avail. This occurred immediately after reboot when updates had completed. Kde Plasma v. 5.43 Qt V. 5.5.0 Kernel 4.2.5-300.fc23.x86_64 Hardware: Graphics card: AMD Tonga Pro Radeon R9 380 4GB CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz Memory 16GB DIMM DDR3 Synchronous 1600 MHz (0.6 ns) Reproducible: Always Steps to Reproduce: 1. Reboot after updates 11/16/15 2. Plasma 5 loads very slowly 3. Applications are barely usable as they take are slow to open and text input (even in this form) gets halted. Actual Results: System is so slow following recent update it is unusable. Everything was fine preceding recent update. Expected Results: System performance should remain the same or have improved.
Ok - seems to have been a compositor problem. Selecting and applying xrender in the compositor seems to resolve the problem - as does reselecting and applying OpenGL 3.1
Problem is ongoing. Seems to be related to compositor and definitely has only occurred even after today's updates. My other machine has identical hardware/software except that I have not applied today's plasma updates. That machine works fine. Even typing this text is extremely difficult as the input gets halted.
please attach the output of qdbus org.kde.KWin /KWin supportInformation once obtained with slow GL compositing and once with resolved (when reselecting GL 3.1)
Created attachment 95568 [details] Output of qdbus org.kde.KWin /KWin supportInformation with various compositing options
There have been similar problems with slight improvement today 11-17-15 after Qt and other updates. After selecting EGL and rebooting there has been a vast improvement and return to normal. (This was previously not the case with selecting EGL.) Even the flickering on my dual monitor setup has disappeared. I attach the output of qdbus org.kde.KWin /KWin supportInformation with various compositing options. I did not reboot between compositing changes. Please let me know if that is required. Thanks.
> OpenGL renderer string: Gallium 0.4 on AMD TONGA (DRM 3.0.0, LLVM 3.7.0) That would be the new AMDGPU driver, yes? > Plugin: org.kde.kwin.aurorae > Theme: __aurorae__svg__air-oxygen "kcmshell5 kwindecoration", please try the breeze decoration, esp. the air-oxygen theme has cause countless bugreports in the past... You don't have to reboot between changes, but i'm esp. interested in the supportInformation when it does *not* work. So what's the status quo? No issues with EGL but GLX is slow unless you change settings? Does a suspend/resume cycle of the compositor (SHIFT+Alt+F12) help itr. as well?
>That would be the new AMDGPU driver, yes? Yes - the new AMDGPU driver. >So what's the status quo? With EGL everything just works perfectly now. Do not know why that is - as selecting it previously did not resolve the issue. Suspending and resuming the compositor (when things did not work) did not resolve the problem. I have since updated my other computer which has identical hardware and software. I selected EGL there first and everything works fine after the updates. I do not know what it was in 11-16-15 updates that caused the problem (they were mostly Plasma updates) - but having a computer rendered unusable by an update is no fun at all. It is frustrating that I cannot identify the exact component that caused the problem - but whatever it was - it seems to be remedied now. Thank you, Thomas.
possible causes - buggy and fixed AMDGPU - buggy and fixed MESA - buggy and fixed or wrong X11 driver The answer is probably in the update logs, notably the second one (may have brought missing package/update or fixed a bug in a package also seen in the faulty update)