View Full Version : [all variants] No signal on external monitor but xrandr reports it is on

Martin Ždila
October 28th, 2010, 08:37 AM

I am running Xubuntu 10.10 (also tried with Ubutnu 10.10). I can't make any external monitor working. Only when I switch to console (Ctrl+Alt+F1), the external monitor nicely mirrors my laptop screen. But when I return back (Alt+F7) the external monitor looses the signal again. I tried many options with xrandr command, trying to set lower resolutions, switch off primary display..., but without any success. xrandr even reports that the monitor is on and uses correct resolution (I see * next to it). The same problem I had with previous Ubuntu release(s).

My configuration is:
Thinkpad Lenovo Z60m
ATI Technologies Inc M24 1P [Radeon Mobility X600]

I have no /etc/X11/xorg.conf file.

Thanks in advance for any advice.