[Bug 30153] IBM X31 freeze under X, shortly after boot

[Olivier Cortes]

Public bug reported:
https://launchpad.net/malone/bugs/30153

Affects: linux-source-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
Hi, when i boot dapper (2.6.15-14.19) on my IBM Thinkpad X31 (P4M
1.4Ghz, type 2672-1G6), the system starts OK, gdm too, i open the gnome
session, and some time after (random, but not long, approx. max 2-4
minutes of uptime), the machine completely freeze, with the HDD LED ON
(not blinking, steadily on, with the disk doing nothing).

Booting the hoary kernel (2.6.12) and loading manually all needed
modules (network, cpufreq and al) makes the machine work like a charm
(never freeze), runs many hours long, but i've got no DMA on /dev/hda
(thus the machine is quite slow).

On another machine (Thinkpad A21p P3 850) with the same -686 kernel, no
crash, no freeze, not a bug.

I don't have any strack trace or dump, when the machine freeze i'm under
X i don't see any kernel message.

As the machine can boot, i can provide a dmesg, and i'll try to boot it
in safe mode to see if it freezes too. Any advice is welcome. I'll try
to provide any information you need, please ask.