Comment 23 for bug 539851

Sudden black screen appeared a few times just before and a few times just after login screen(Flashing Blinking Flickering)... but once pass that, everything was good.
This happened for Ubuntu 10.04 and 11.04 on my M2A-VM mainboard, but not for Ubuntu 9.04.

When pressing Ctrl+Alt+Backspace, I saw these messages overflowing everywhere at command lines...
[drm:radeon_dvi_detect] *ERROR* HDMI A-1: probed a monitor but no|invalid EDID
[drm:drm_edid_block_valid] *ERROR* RAW EDID

THE SOLUTION!!!
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/575985
$ gksu gedit /etc/default/grub
add: GRUB_CMDLINE_LINUX="nomodeset"
$ sudo update-grub
then reboot