I was able to reproduce that bug with -21 kernel but it seems a lot less frequent. So, to summarize, this is what happens:
There are four possible situations : 1) Everything is smooth and fine. 2) Splash screen is ugly but everything is fine once logged (not a real problem) 3) Normal session with backlight flickering. This starts immediatly at login and appears randomly during the whole session. This is a bit annoying but a bit subtle and you can work with it the whole day (if you are in a bright room. A bit more annoying in darker places). 4) Pink world. Heavy corruptions with freezes. This is appears randomly during the session but starts only after at least 4 or 5 minutes. This make it impossible to work with the computer but also impossible to know if you will hit the bug or not.. It has to be noted that those 4 situations are mutually exclusives. It means that if I have an ugly splash screen, I'm sure I will not have any corruption. Also, as soon as I see backlight flickering, I know I will not have any Pink World ! * With normal boot (-21 kernel) : - 50% of the time, everything is fine and smooth (1) - 40% of the time, backlight flickering (3) - 10% of the time, pink world (4) * With normal boot (-20 kernel) : - 80% of the time, pink world (4) - 20% of the time, (3) * With nomodeset (any known kernel): - 100% of the time, everything work but splashscreen (2) -- [lucid][R500 X1400] intermitent screen corruption (pink world ) - regression from -20 to -21 kernel https://bugs.launchpad.net/bugs/545096 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
