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There are a lot of possible reasons for this. One of them will be explained here :
The graphics device is accessed by the X server with a modeline
,
that causes a signal, that cannot be displayed correctly by the monitor.
modelines
manually is a hard job.
Older X server distributions (up to and including XFree-3.1.2B) contained the file
/usr/X11R6/lib/X11/etc/Videomodes.doc
which explained the procedure
in detail. However in newer distributions this file isn't contained anymore
since it isn't needed nowadays. The reason for this is the following :
xvidtune
. You can use it to
configure a mode line
interactively. Start xvidtune
in an xterm. If there should be errors, please see
xvidtune
modelines
for the same resolution in the file
/etc/XF86Config
, produced by xf86config
.
Comment out all lines for the same resolution except for one. Take a look at the
effect. If you like it, take this mode line, if not, repeat the process
with the other modelines
. It could be that the X
server cannot find any fitting dot clock
for the given
modeline. It will inform you about this in the file ~/.X.err
:
Mode "0000x0000" deleted.
(where 0000x0000
is the
modes name).
modelines
for your graphic card and your monitor from the file
/usr/X11R6/lib/X11/doc/Monitors
.
XF86Config
file in the files in the directory
/usr/X11R6/lib/X11/doc
.
/etc/XF86Config
than your monitor can handle. Wrong or too high
values can cause severe damage
at the monitor.
Please read carefully the technical specification of your monitor. If you are unsure
about the settings you should try somewhat smaller values. And again :
See also:
Keywords: X SERVER, SCREEN, MONITOR, XVIDTUNE
Categories:
X Server
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