You have been subscribed to a public bug:
Since last night's updates, automatically logging in with LightDM causes
the screen to be blank with only a cursor shown. The desktop does appear
to be rendered on the background, because moving icons and clicking
menus (after guessing where they are) does work. The only way to get
things normal again is by restarting the lightdm service.
It doesn't seem to happen every time, but it does happen a lot. I have
also noticed that when manually logging in, the dmesg output on tty7
sometimes blends in with the desktop; for instance, a black box with a
blinking cursor is shown, or when plugging in a USB thumb drive, the
output from 'mount' will be displayed, until I move my cursor over that
area.
I'm running fully up-to-date Xubuntu 12.10 (no proposed packages though)
on a laptop with Intel graphics (xserver-xorg-video-intel driver).
ProblemType: Bug
ApportVersion: 2.6.1-0ubuntu2
Architecture: amd64
Date: Wed Oct 10 09:49:02 2012
DistroRelease: Ubuntu 12.10
Package: xserver-xorg 1:7.7+1ubuntu4
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
SourcePackage: xorg
Tags: quantal
Uname: Linux 3.5.0-17-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: autologin blank lightdm quantal screen
--
After X update, tty7 is very glitchy
https://bugs.launchpad.net/bugs/1064878
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