Hi!

I have this problem (in Open SUSE 13.2 x64 KDE 4.14.3):
After leaving a (usually older) full-screen game with low resolution (eg. hitting Ctrl-F9 at DOSBox, while at full-screen mode, or clicking "Quit game" eg. at Open Tyrian), desktop resolution remains at 640X480.
I have the latest (legacy, proprietary) drivers for Nvidia 6xx series (from repositories).
Launching these games (-programs) from Konsole, returns 2-3 Bad Arguments and a big number (>250) of Failed Requests (after returning from full-screen).
I can't tell any details though, because both Konsole and Yakuake are malfunctioning at the time (after returning from full-screen).

I tried also enabling-disabling desktop effects (both for full screen only and altogether) and don't seems to make any difference.

The workarround (because at so low resolution, "Display and Monitor" is unusable), is setting from konsole (with xrandr) the resolution at 1024X768 (because xrandr can't set it, at 1360X768) and after that. launching "Display and Monitor" and set it at 1360X768.
Of course. then my desktop applets are messed up and I have to rearrange them.
This problem, is KDE related.
I installed Gnome (for testing this problem), and coming back from full-screen, is error-free.

Does someone else, knows any more details on that?
TIA and have a HAPPY 2015!!!