I have a CentOS 6.9 workstation with a NVIDIA video card and I would prefer not to use the NVIDIA provided driver for. So, I have the nouveau driver installed. However, with this setup my screen resolution is very low on a LG monitor. Here is what xrandr reports:
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$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
1024x768 61.00*
800x600 61.00
640x480 60.00
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# cat /etc/X11/xorg.conf
Section "Device"
Identifier "Videocard0"
Driver "vesa"
EndSection
Thanks!