Comment 11 for bug 21416

I have been using the VBEModes option for a few days now and and have not had any problems with blank screens after logoff since. I have also been able to switch VT's ok with chvt. Still no joy with Ctrl-Alt-Fn, but that's a seperate issue - there appear to be lots of xkb bug reports for that one.

I have done a bit of testing and found that disabling dri in xorg.conf also cures the problem, so perhaps this a kernel bug with the via drm module rather than a problem with the xorg via driver? Anyhow, until someone fixes this, the VBEModes option is the best workaround for now.

One last thing, the vga=791 boot option *is* neccessary for graphical boot with usplash. Otherwise usplash is garbled and you don't get to see gdm login screen. It does need to be disabled to boot to console in recovery mode though, otherwise you get a blank screen and you need to login and reboot blind. Hope I did not cause any confusion with my previous post - I was testing stuff in console mode and had forgotten I had set up grub to append the vga=791 option to the default kernel boot options.