My mother has a small AMD-fusion based desktop. The integrated GPU is labelled as Radeon HD 6310. I successfully made this machine work under 12.04 about 6-8 weeks ago. If I remember properly, I did manually install AMD's binary driver.

On Sunday, while I was visiting, I did update the system, and now the GUI doesn't come up anymore at boot. I haven't changed anything else.

Here's some basic info...

GPU (lspci | grep VGA) :
00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6310]

Kernel (uname -a) :
3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Latest Xorg log (cat /var/log/Xorg.0.log) :

Running drivers (lsmod) :

Also, running apt-get update and then apt-get upgrade didn't fix things, but it specifically says that the kernel packages (linux-generic, linux-headers-generic and linux-image-generic) are being kept as is (bare with me, this is a French system (yeah, remember, it's my mom's), it says "conservés" which I guess translates to "held back" i.e. not upgraded).

I'm a bit puzzled and don't know exactly where to go from here...
Can anyone help based on the info provided above ?
Thanks ahead for any hint.