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Resume from S3 breaks console

Hello everybody,

debian-laptop has no answer so I'm trying here...

This is the last issue I have with Debian Sid and my HP Omnibook. It resumes correctly from suspend-to-ram (S3) to X, but the console shows green dancing squares and the resolution is dropped to 640x480. I can type blindly to it and I can switch back to X, but that's about all I can do.

What I have tried already:
1. 'reset' ... yeah, right ... if it would be that simple ...
2. No framebuffer: this is worse. X has some 3 or 4 bad vertical lines and switching to console hangs the whole system.
3. atyfb with various parameters: The same bad lines in X. I can type blindly in the console and go back to X. Trying to change resolution with 'fbset' will crush the system.

This is my setup:
Stock kernel 2.6.15-1-686 with vga=792 acpi_sleep=s3_bios
                              without this, X would have a black screen

$lspci -v
0000:01:00.0 VGA compatible controller: ATI Technologies Inc Rage Mobility P/M AGP 2x (rev 64) (prog-if 00 [VGA])
	Subsystem: Hewlett-Packard Company: Unknown device 0010
	Flags: bus master, stepping, medium devsel, latency 66, IRQ 10
	Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
	I/O ports at 9000 [size=256]
	Memory at f4100000 (32-bit, non-prefetchable) [size=4K]
	Expansion ROM at 38000000 [disabled] [size=128K]
	Capabilities: [50] AGP version 1.0
	Capabilities: [5c] Power Management version 1

Any suggestions how to reset the console?
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)

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