[kde-linux] reconfigure graphics/video

Beso givemesugarr at gmail.com
Thu Jul 10 07:55:59 UTC 2008

2008/7/10 Anne Wilson <cannewilson at googlemail.com>:

> On Wednesday 09 July 2008 23:27:00 Lisi Reisz wrote:
> > I have set up a new installation of Debian Etch running KDE on one
> monitor,
> > and it will be run with another.  Kcontrol has a good choice of
> > resolutions, but only one refresh rate.  If that is the right refresh
> rate,
> > great.  If not, how do I reconfigure?
> >
> Caveat - I'm not a hardware guru.  Now - modern monitors report to the
> system
> what their requirements are.  If your monitor does that the system should
> pick up the range of resolutions it can use and the best refresh rate.  The
> resolution is a matter of choice, but changing the resolution can be
> dangerous to the monitor.  HTH
> Anne

xrandr is the way to modify the resolution choosing between the ones
supported by the monitor. changing the monitor resolution outside of these
modes could have your monitor broken. the system settings should have an
embeded xrandr control center so if you don't find a resolution in there
then there shouldn't be supported. if you want more info go have a look at
the file: /var/log/Xorg.0.log and search for read-edid lines. the modes
reported in this file after that lines (there should also be a report on the
monitor name and producer there) are the ones that your monitor supports. in
some cases the edid read in broken (it happened sometimes with some releases
of fglrx ati driver) and you would have at that time override the mode
setting by generating a modeline with a modeline generator, put it in
xorg.conf and then force the driver to use it. sometimes, even if you force
the driver to use a specific mode it wouldn't be used because the driver
could not override the edid informations (a control for preventing damaging
the hw). if you really know that your monitor supports resolutions and modes
not listed in the xrandr configurator (for example from the monitor user's
manual) you could ask more on forcing modes on xorg-mailing list, or you
could wander a little on google (it will surely find a lot of stuff), but be
aware that no-one should be held responsible if you damage your hw.

dott. ing. beso
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