In one beautiful moment my monitor connected to HD7970 start working on 1600*1200, before all was ok at 1920*1080.
1920*1080 was not listed in windows settings.
Ok, i've created custom resolution in radeon software and all seems to be fine, except just one moment:
Resolution not saved and i have to create it again each time i reboot.
I've tried different software/driver version, running radeon software with admin privileges - no luck
Is there option to make created custom resolution persistent?