Hi Fabian,
Can you please attach your /var/log/Xorg.0.log and /etc/X11/xorg.conf
files, and the output of lspci -vvnn?
There can be a few reasons why an externally attached VGA monitor may
come up as 1024x768 max in xrandr, but a common reason (and one I
suspect in this case) is the 'EDID' information from the monitor is not
coming through (this can be determined by inspecting the Xorg.0.log
file). Without the EDID, xrandr will simply assume some safe generic
defaults (which implies a maximum of 1024x768). A workaround if this is
the case would be to manually specify your Horizontal and Vertical
refresh rates in your xorg.conf. You can obtain these values from the
manual that came with the VGA monitor. For example:
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 30-130
VertRefresh 48-170
EndSection
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
--
Xorg 7.3 with Intel does not display maximum resolution anymore
https://bugs.launchpad.net/bugs/187365
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