I have the same problem (Dell 530s with ATI HD2400XT video, with
ati/radeon open source drivers). Going through the
DebuggingKernelSuspend procedure I end up with

[    1.765524]   Magic number: 0:953:349
[    1.765527]   hash matches 
/build/buildd/linux-2.6.27/drivers/base/power/main.c:390

No further hash lines.

On the odd occasion that my screen _does_ come back, I notice a whole
series of error messages related to the ata subsystem. I haven't been
able to capture them yet (they end with 'ata.1 {DRDY ERR}' type line but
that doesn't say much).

-- 
Resume doesn't work on a Dell 530s
https://bugs.launchpad.net/bugs/313647
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