Comment # 1
on bug 86861
from Christian König
Sounds like just another buggy KVM switch to me. The basic problem is that the I²C used to read the EDID assumes that you only have two endpoints on the wire - the display and the gfx hardware. So properly designed KVM switches have an micro-controller which fetches the EDID from the monitor on connect and forwards the EDID to each connected system if requested. Otherwise you run into problems when by pure coincident two systems try to fetch the EDID at the same time. Without the EDID the gfx hardware has no idea what resolutions the display can handle and most likely doesn't choose the optimal one. Easiest workaround is manually set the necessary resolution for the display.
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