For my external Dell display I'm also stuck with 1024x768. As a work-
around, the script below forces the 1600x1200 resolution. I have put the
script in ~/.kde/Autostart/xres_fix.sh and done chmod +x
~/.kde/Autostart/xres_fix.sh to make it execute after KDE starts. I
guess it could be executed also earlier if put into the right
.Xsomething file.
------------------------------------------
#!/bin/sh
# add 1600x1200 resolution for VGA1
# generate modeline with
# cvt 1600 1200 60
# modify resolution only if VGA1 is connected
if xrandr | grep -q "VGA1 connected"
then
xrandr --newmode 1600x1200 161.00 1600 1712 1880 2160 1200 1203 1207 1245
-hsync +vsync
xrandr --addmode VGA1 1600x1200
xrandr --output VGA1 --mode 1600x1200
fi
------------------------------------------
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https://bugs.launchpad.net/bugs/712075
Title:
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid
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