Xorg resolution with VGA Switch

Barry Scott barry.scott at onelan.co.uk
Thu May 28 03:19:56 PDT 2009

Aaron Plattner wrote:
> On Wed, May 27, 2009 at 07:49:18AM -0700, Aurélien PROVIN wrote:
>> Hi,
>> I bought a VGA switch to switch some devices on one monitor.
>> But resolution of my X session is limited to 1024x768 instead of 1920x1200.
>> If I hotplug the switch when the X session is started in 1920x1200, it works.
> It sounds like the switch is preventing the hardware from reading the
> EDID from the monitor.  Check /var/log/Xorg.0.log for warnings to that
> effect.
This is very likely.

We had to buy very carefully to get a KVM that switched DDC signalling.
Most don't bother. Check the specs of your KVM.


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