Also on Dell Studio 1555. Radeon 4500. fglrx driver in use,
2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:28:05 UTC 2010

After fix for this bug 
https://bugs.launchpad.net/ubuntu/lucid/+source/linux/+bug/526354 has been 
committed and released, laptop properly goes into standby mode. However when 
trying to resume screen stays black (no backlight even). Sysrq keys work (the 
only way to reboot apart from pressing and holding power button).
Switching to open driver fixes the problem, but due to the lack of PM with open 
driver, fan is blowing at full speed at most times ), with temps much higher 
than fglrx. (+noise). 
Sad, beacuse the open driver works better than fglrx (no tearing, better 
handling compiz). 
Still I have to cope with the lack of suspen/resume which is very inconvenient 
but still better than overheating and reducing battery life.

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Suspend-Resume Regression in 10.04 on Dell Studio 1555 with Radeon HD 4500
https://bugs.launchpad.net/bugs/574848
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