Comment 9 for bug 769911

Hi all,

I have the same problem with a RadeonHD graphics card (ATI Technologies Inc Mobility Radeon HD 3400 Series).

System information:
- Natty (Ubuntu 11.04) with Unity
- clean install
- no proprietary graphics drivers installed
- added medibuntu packages to software sources (not sure if this is relevant)

I'll try to describe my case as exactly as possible:
As often as 2-3 out of 5 times, one of the following happens after logging in:
1) Natty just freezes on the splash screen. In this case, if I have the sound turned on, I can usually hear Skype connecting (not always), but I don't see anything. I can move my mouse pointer.
2) Natty freezes on the splash screen, which then goes black, comes back, goes black again, ... and
  a) finally stays black or
  b) shows my desktop, but with distorted graphics, mostly no top panel. This case is rare.
In all cases except for 2b, hard drive activity stops after a while.

While the screen is frozen (splash screen or black)
- Ctrl+F2, ... , Ctrl+F8 doesn't get me anywhere.
- Ctrl+Alt+Del doesn't do anything either.

It has taken me up to 5 or 8 consecutive tries until the system boots correctly. After that, everything works as usual.
Waking up from hibernation usually works fine, too.

Let me know if I can do anything to help narrowing down the problem or if you need more information on my system.