resolution in lxc-desktop guest

[prometx]

Hi,

Thanks very much for lxc-desktop, it's very useful. I can't seem though to change the resolution in my ubuntu-desktop guest. It seems locked to 640x480. I've tried customizing the xorg.conf, but on restart, it gets overwritten with a defualt.

I've also tried some xrandr changes but get: xrandr: failed to get size of gamma for output default

when trying. Please let me know if you have any thoughts about this, and thanks agian!