I don't use Mythbuntu, but I am encountering the same issue on a fresh
install of Xubuntu. Based on my experience and those reported in the
ubuntuforum.org thread previously by neutron68, it seems there are a few
critical thing we have in common:
*Nvidia video cards
*user-selected screen resolution due to faulty auto-detected settings.
*the presence of an xorg.conf file in liu of auto configuration by X
*XFCE as the desktop environment (both Mythbuntu and Xubuntu uses XFCE)
things that don't seem to matter:
*monitor type/model (I have a ViewSonic CRT)
*upgrade vs. install (I didn't upgrade as some here did)
*OSS vs. proprietary X driver (I haven't used Nvidia's binary drivers)
my xorg.conf file was auto generated with "Xorg -configure". With some
tweaks, I was able to eliminate one of the possible culprits (undetected
monitor - my ViewSonic PF790 is now being recognized). Some of it
contains code that were cited previously as possible solutions (device
names/identifiers). Unfortunately it isn't working for me. My Kernel
is up to date and so is everything else to the best of my knowledge.
** Also affects: xubuntu-desktop
Importance: Undecided
Status: New
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gdm ignores timed/auto login on all but first greeter run
https://bugs.launchpad.net/bugs/463314
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