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Garbage is also visible on the display immediately before entering suspend-to-RAM, but it resumes successfully, so that's not a priority.
The resume process (using uswsusp) appears to complete (reaches 100%) but then the display is replaced by garbage (including ttys). If on an X display, the mouse is visible as a roughly 128x128 square of garbage pixels that I can move around the screen. If I switch to a tty, login and reboot (blindly, as the screen is garbage) then it successfully reboots and runs without issue.
My laptop is a Dell Studio 1555 (with Mobility Radeon 4570).
Using vbetool to save and restore VBIOS state before and after hibernating (via hibernate-script) makes no difference that I can see.
How would I go about figuring out what's going wrong here?
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