Why do parts of my windows blank out in KDE? My computer: Lenovo ThinkPad E15 Gen 2 with Intel Corporation TigerLake GT2 [Iris Xe Graphics] (rev 01) graphics controller, running Debian 11 and KDE plasmashell 5.20.5. I have an odd problem: several windowed applications (konsole, firefox and others) 'blink' from time to time; in konsole if seems to be connected with text being printed - see the two pictures below. Sometimes a line 'disappears' after a line of text is printed by ping, then it comes back when the next line is printed. On other occasions it is a whole area of text, and ofcourse, it is intermittent. It doesn't seem to affect all programs, but I have certainly seen it in konsole and firefox. Any idea how to address this? ![A line blanks out]( ![And then it is back](

Versions of kwin (KDE-Plasma screen compositor) < 5.21 offer a suboptimal way to sync on VBlank this leading to screen tearing and miscellaneous other inconveniences depending on the graphical adaptor when compositor is enabled.

KDE-Plasma current being 5.25 to date, the very best advice is to upgrade your 5.20.5 to whatever >= 5.21 your distribution can offer.

If impossible for whatever reason then a first possible workaround consists in forcing the video adaptor so sync on VBlank (possible with nvidia-settings for nvidia adaptors, I cannot tell for others and set KDE-Plasma sync to VBlank mode to NEVER (via kde-systemsettings > Display)

If the above trick still does not provide satisfactory results then the very last solution to get definitely rid of the problem consists in : **Disabling compositing entirely.**