The behaviour has changed a bit after latest updates.
I have a HP Pavilion dm4t 
uname -a
2.6.38-10-generic #44-Ubuntu SMP Thu Jun 2 21:32:22 UTC 2011 x86_64 x86_64 
x86_64 GNU/Linux

I have the feeling that a month ago I needed 6-7 reboots until working
OK, now I only need 3-4.

Another change is that after it starts OK, the screen is dimmed so much
that is turned off (my laptop has such feature to turn off the
backlight). So in order to login I have to increase brightness (switch
backlight on).

WIth previous kernels the screen was backlit after successful loading of
X.

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https://bugs.launchpad.net/bugs/727620

Title:
  [Radeon HD 5650 and 5470] Kernel BUG during recovery boot and in
  normal boot (Hybrid graphics)

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