Hello!
have a problem - i have a slackware64 14.1 installed on asus p8h61 motherboard, i3 cpu, no integrated video, asus nvidia gt210 pci-e videocard.
video connected throught d-sub to planet 4 port kvm ( kvm-410) -not know, it is revelant or not.
problem is - if i switch to that computer before switch it on - all be ok - on switching on video output initializes, and all is as it must be.
but if i start it without switch kvm output to it - then i have no video output - monitor not get signal at all. i can log in into that computer via ssh, and all looks work except videosignal out. there is also last nvidia legacy driver installed, and i see to "nvidia-smi" command for any wake-up switches or so, but not found anything.

any ideas, advices?

I had a kvm for USB devices that got its power from the USB connections. If one of the two computers was powered off (no power supplied through the USB keyboard or mouse connector) and the kvm switch was last using that powered-off computer, then the kvm switch was dead.

The problem didn't occur if both computers were powered on because then the kvm switch had power not matter which computer was selected.

I've never had this problem with PS2 connector kvm switches.

Also remember that kvm switches have limits on the video characteristics they will support. If your keyboard is inoperative and it's not just the video that's dead then consider looking at whether the kvm is receiving power.

i repeat the same situation with no kvm - switch on computer with no vga cable attached, and after some seconds attach d-sub cable - the same result - no signal.

It is likely that your computer is not able to determine the correct resolution and refresh rate for your display if it is not switched on on the KVM. Repeat your tests, but add to your boot parameters (the append="" line, if you use Lilo). Modyfy those parameters to the actual correct values for your display, 1024x768@60 indicates that the system should start with a resolution of 1024x768 pixels with a refresh rate of 60Hz.

Thank you! it works - at least witn nouveau driver!
test in few days with nvidia driver too!

sadly, but looks like, with nvidia driver ( 331.49) that solution not works....

The Nvidia driver does not support KMS, so no, that solution will not work.

but there is possible any another solution? it is not good, when starting computer without monitor attached, later, when you attach monitor, you cannot get screen to work until restart computer...

I cannot reboot to test but is use nividia settings from the cli to turn screens on and off, maybe this command could help (it switches me back to a single screen).

SavoTU: i do not X server running, as so that command back to me with:

ERROR: The control display is undefined; please run `nvidia-settings --help` for usage information.

A quick google found me this command which is working here but i am still not able to reboot to check with the monitor not connected.


https://bbs.archlinux.org/viewtopic.php?id=66169

edit, forgot to say it has to be run as root

command work ( not error msgs), but nothing changes - monitor not wakes up...