After installing 10.04 I experienced a GDM lockup a couple of times a day – the symptoms varied from the window management not reacting to left mouse clicks to a complete freeze of the Xserver. This bug has caused a lot of noise across distributions, for instance in 590109 and 538563. The symptoms are log messages such as
[mi] EQ overflowing. The server is probably stuck in an infinite loop.
in the :0… logfiles in /var/log/gdm when the problem occurs.
This is, however, not a kernel, XServer or GDM issue, but caused by a problem with the intel-linux driver. The problem is apparently fixed as of version 2:2.11.0-1ubuntu1 of the xserver-xorg-video-intel driver. Since this is not (yet) an update in the official distribution repo, I did the following to solve the issue:
1: Optional: Update to the latest stable kernel
Reason: IMO, upstream Intel drivers are usually build against the latest stable kernel
Goto http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-lucid/ and download the headers… _all.deb, headers-generic …..deb and linux-image… .deb for your platform (in most cases, i368). install the generic headers package, then the all headers package, then the image.
A word of warning: If you install this custom kernel you will not receive security updates for it from the automatic distribution updates.
2: Add the X Updates PPA to your sources.list
In a terminal, type:
sudo gedit /etc/apt/sources.list
And add at the bottom of the file (if not already present):
deb http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu lucid main #X-Updates PPA
deb-src http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu lucid main #X-Updates PPA
2.1: Trust the software packages from the x-updates PPA
sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com AF1CDFA9
3: Update the driver
sudo apt-get update
sudo apt-get dist-upgrade
Reboot – the problem should be solved.