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Old 09-10-2006, 12:04 PM   #1
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X server -> text console -> X server => system sometimes freezes


I have got laptop Acer TravelMate 8004LMi (Intel Centrino, CPU Pentium M Dothan 1.7 GHz, graphic card ATI Mobility Radeon 9700) and I have an ugly problem:

A few days ago I have upgraded to the Debian Etch and nowadays when I switch from the (7.0.0) to the text console (or into revers order), a kernel sometimes totally freezes. It does absolutely randomly, sometimes on 16th switch, sometimes on 158th switch... and only black screen I can see. I have tried various kernel versions (2.6.10, 2.6.15, 2.6.16, 2.6.17, even vanilla, some experiments with ACPI parameters (acpi=off noapic nolapic), various graphic drivers (fglrx, vesa) and text console with framebuffer and without.

Previously I have used the Debian Sarge (kernel 2.6.10, XFree86 4.3.0). The behaviour have been similar, but only picture have disappeared (and have been black) and I have needed to do a next few switches (between console and X server) and picture have revived. But now a kernel totally freezes and reset is the only thing that I can do.

It is strange when I take old kernel 2.6.10 (that I have used in Sarge), a kernel freezes even so. When I use vesa driver, a kernel freezes exactly after 7 switches to the X server and back to the text console. With fglrx it freezes absolutely randomly.

I am very confused by this strange system behaviour and I have no more ideas what to do to find a solution of this trouble.

Thanks a lot for any advice
Old 09-10-2006, 01:27 PM   #2
Registered: Dec 2004
Location: San Antonio, TX
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On my last computer mine would freeze (no black screen but no response from any input devices and all process seem to freeze as well.)

Removing acpid did the trick, but then, I didn't have a need for it on my desktop.
Old 09-10-2006, 07:39 PM   #3
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But in my case a kernel seems to be totally dead (I can't ping laptop over network).
Old 09-11-2006, 07:14 PM   #4
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I have some new experiences:

1. It freezes on a FreeBSD as well
2. vga driver works fine (vesa and fglrx are in trouble)
3. The same behaviour is also on another TM 8004LMi, so it doesn't seems to be HW problem
4. A kernel is totally dead, it is impossible to use SysRq


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