https://bugs.kde.org/show_bug.cgi?id=406180
--- Comment #62 from Jeffery Patton <roundduckm...@gmail.com> --- (In reply to John A from comment #55) > (In reply to John A from comment #54) > > (In reply to Jeffery Patton from comment #51) > > > (In reply to John A from comment #50) > > > > I can confirm that the regression appears in Kubuntu 19.04 with kwin > > > > 5.15.90, an NVIDIA Optimus setup (NVIDIA is selected as the primary > > > > GPU), > > > > OpenGL 3.1 used as the rendering backend and options nvidia_drm > > > > modeset=1 > > > > set(to enable PRIME Synchronization and eliminate horizontal screen > > > > tearing). > > > > > > > > KWin hangs when using active screen edges (Present Windows), > > > > Alt-tabbing and > > > > sometimes when maximizing or moving a window. > > > > > > > > Switching the rendering backend to XRender resolves the issue. > > > > > > XRender doesn't resolve the issue, it's an ugly workaround that forces > > > software rendering. It's just about as bad as disabling Prime Sync. > > > > > > Thanks for confirming this affects the upcoming 5.16 as well though. > > > > Oh I agree that XRender is an ugly workaround. I was just pointing out that > > KWin does not hang when XRender is used as the rendering backend. > > > > In addition, the aforementioned fork (kwin-lowlatency) exhibits the same > > behaviour. > > > > I will apply the patches mentioned in this thread and report back. > > Just to be clear, when I wrote that kwin-lowlatency exhibits the same > behaviour, I meant it hangs, it does not resolve the issue. Well, that isn't good then. I wonder how you would apply the patch on KDE Neon, so I can test it out. -- You are receiving this mail because: You are watching all bug changes.
