Resolution issue with kvm switch

Alex Deucher alexdeucher at
Thu Jul 5 10:59:30 PDT 2007

On 7/5/07, Tom Winterhalder <t.winterhalder at> wrote:
>  Hi all,
>  I have several systems connected to a Level1 KVM switch. According
> documentations this switch can handle resolutions up to 1920x1440.
>  Now I have connected several Linux systems to this switch with different
> graphic cards (ATI and Intel). Directly connected to my monitor (HP LP2465)
> I get a resolution of 1920x1200 with all the systems. As soon as I connect
> the systems to the switch and restart X I only get a resolution of
> 1280x1024. Without restarting X, just connecting my systems to the switch I
> still have the resolution of 1920x1200.
>  Looking into the log files I can see, that the switch is reporting to
> display resolutions of up to 1280x1024. So it is clearly a problem of the
> switch not reporting correctly its capabilities. As I have no possibility to
> upgrade the firmware of this switch I wonder if there is a way to override
> these settings in xorg.conf.
>  I already tried different Modelines and Mode settings without any success.
> Can anyone help me solving this issue?

Add a monitor section to your config with the appropriate sync ranges
and modes for your monitor then specify the modes you want in the
display sub-section of the screen section of your config.  That should
do the trick.


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