Red Hat Bugzilla – Bug 436555
KVM switch blocks monitor detection
Last modified: 2008-03-17 11:27:54 EDT
Description of problem:
I have a server room with a single keyboard, mouse, and monitor. A KVM switch
controls the machine with which those devices communicate. With both Fedora 7
and Fedora 8, the monitor is not detected properly when the KVM switch is set on
the target machine. I get a resolution of 800x600 and an invisible mouse
pointer. I have to explicitly set the horizontal and vertical refresh rates of
the monitor, and list the modes I want in xorg.conf. I also have to turn off
the hardware cursor to get a visible mouse pointer. If I plug the monitor
directly into the target machine, detection works, so the KVM switch is playing
a role here somehow.
I am attaching the xorg.conf I have to use, as well as an Xorg.0.log when that
xorg.conf is in use. You'll note that I also set the TargetRefresh option.
That is because without it, I do get 1280x1024, but at a suboptimal refresh rate
(I've forgotten what).
I'm happy to mess around with the settings if there are things you would like me
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Set the KVM switch to the target machine
2. Boot the machine
800x600 resolution and an invisible mouse pointer
1280x1024 resolution and a visible mouse pointer
Created attachment 297253 [details]
xorg.conf that works
Created attachment 297254 [details]
Xorg.0.log with the xorg.conf that works
There's really not a lot we can do about this. The KVM is physically preventing
us from asking the monitor what it can do.
Well, that's what I thought. But in this thread:
Matej Cepl insisted that this behavior is a bug and asked me to file it as such.
So I did. Maybe you should assign the bug to Matej. :-)
I should deserve it ... Sorry.