I have a dell studio 1555 with mobility Ati radeon 4570 i have installed the latest 6.12.191 too. I am running ubuntu 10.04 alpha 3. I have observed that once i suspend and resume, the lock screen shows in the right corner and even if i login somehow, i see that i cannot read anything, its all flickery (the flicker is constant .. i mean its like i see the same character couple of times .. ) So Menu will me MMMeeennnuuu where most of the characters are partially clear. Its like a huge hazy screen ... Whats wrong, is it a known issue. Let me know if i need to give some logs. Good job guys. Thanks Kaka