https://bugs.freedesktop.org/show_bug.cgi?id=43858
--- Comment #20 from Alex Deucher agd5f@yahoo.com 2012-01-18 08:39:43 PST --- (In reply to comment #19)
Hello everyone. I think I have solved! Just simply unplug the VGA cable and now the monitor works perfectly with the settings suggested by Alex!
Thank you all for your precious help!
Great. With both monitors plugged in the driver is driving both of them which is probably more bandwidth then the card can handle.
One last question (if si possible): When I start the computer and launch Ubuntu, the mouse pointer, at the login screen. is corrupt. If I access so, the desktop is corrupted by light blue lines. However, if all goes well, reboot. Everything is fine even if boot Windows first and then reboot and launch Ubuntu. In practice, when I turn on the PC, if I want to use Ubuntu I have to reboot to get everything in place. This happens even if I use VGA.
You have an idea of why?
Possibly some uninitialized register. Does running an application that uses Xv also fix the issue? This should probably be tracked as a separate bug.