Imho i dont think it's a xorg related problem I dont use fbdev under xorg and I tried the "nopm" option but it doesnt work for me. And today I noticed that X crashes just pressing the lock-screen button very very very boryng, I think it's a kernel related bug...
-- Xorg exits when it receives an ACPI button/lid event https://launchpad.net/bugs/61746 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs