With dell studio 1555 and the standard repo 64-bit kernel i found latest 
version of the ati driver released these days (10.5) solves the problem.
Download it from the official ati/amd website and try if that works. 
Changelog of ati driver also states:
"Resuming from sleep no longer causes the display number overlay to become 
corrupted"

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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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