[NCLUG] NCLUG Digest, Vol 213, Issue 2

Steve Wolf stevewolf6 at gmail.com
Thu May 14 10:49:25 MDT 2009

> Another thing to try is run "xrandr -q" when the machine is running in
> 1600x1200 mode and then when it's in the docking station and compare the
> output of the two.  Post the output to the list if you'd like us to look at
> it.

xrandr is extremely useful for seeing things as they are, and for
forcing a different screen resolution (e.g. "xrandr -s 1600x1200").

To see things as they could be, I find it useful to plow through the
X11 startup logfile, which is at /var/log/Xorg.0.log on my CentOS
system.  The section where it chooses screen resolution begins in my
logfile with "(II) Setting vga for screen 0."  It's fairly verbose and
will give you an idea of why it's choosing the resolution it does.

Learning from the logfile, I've been able to tweak my
/etc/X11/xorg.conf file so that it works equally well when my laptop
is standalone at 1280x800, or in the docking station connected to two
flatscreen displays, each at 1280x1024 in twin screen mode.

Reply if you need help interpreting your log file.


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