After systemctl suspend, one of my monitors often does not wake up properly, but says “no signal”. When I disconnect and connect it again, it works again. I guess it’s because the EDID/DDC-communication fails.
This worked several weeks ago, so it may be caused by some NixOS-software-update or some minor hardware defect. Is this a (known) bug/regression, and is there a workaround?
Details:
2-monitor-setup, 1 connected via DisplayPort, 1 via DisplayPort-DVI-Adapter
the DVI-monitor always wakes up correctly, the DisplayPort-monitor only sometimes
when the DisplayPort-monitor does not wake up correctly, the chosen mode (1680x1050) is missing in xrandr, and an additional VIRTUAL1 appears:
DP1 connected primary 1680x1050+1280+0 (normal left inverted right x axis y axis) 480mm x 300mm
1600x900 60.00
…
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
1680x1050 (0x4a) 146.250MHz -HSync +VSync
when it works correctly, the 1680x1050-mode is there, and there is no VIRTUAL1:
DP1 connected primary 1600x900+1280+0 (normal left inverted right x axis y axis) 480mm x 300mm
1680x1050 59.95 +
1600x900 60.00*
…
VIRTUAL1 disconnected (normal left inverted right x axis y axis)