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I'm running the 5.4.72-1-lts kernel with the nvidia-lts package, I have a 1680x1050 VGA monitor connected to my Nvidia card through an HDMI adaptor. Xrandr recognizes the monitor but only with a 1600x900 mode.
I tried adding a 1680x1050 mode but it returns
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 46
Current serial number in output stream: 47
I tried adding
Option "ModeValidation" "AllowNonEdidModes"
but nothing changed.
I got it to work with the Noveau drivers but that has its problems in itself.
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