Hi, my ~ 10 year old Iiyama ProLite X2775HDS sometimes does strange things when i wake it by keyboard or mouse movement after X had cut off itsi signal because i was inactive for a few minutes.
Either it stays black although it reported to have in nput signal again, or it shows an interlaced and displaced image of what fvwm is supposed to display. A power cycle of screen reliably brings the correct display. In more than 99 of 100 tries it just wakes up ok, though. It seems not to be related to the computers to which it has been attached since i got it. Have a nice day :) Thomas