After installing the latest testing Debian on an IBM Thinkpad R60e laptop, the X server dies after some time without any apparent user action. The log shows:


Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80adffb]
1: /usr/bin/X (0x8048000+0x5aca5) [0x80a2ca5]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb778640c]
3: /usr/lib/xorg/modules/extensions/libdri2.so (0xb73b8000+0x1d8c) [0xb73b9d8c]
4: /usr/bin/X (0x8048000+0x2c1a7) [0x80741a7]
5: /usr/bin/X (0x8048000+0x1e9ba) [0x80669ba]
6: /lib/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0xb74b6c76]
7: /usr/bin/X (0x8048000+0x1e5a1) [0x80665a1]
Segmentation fault at address (nil)

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting

The graphics HW is

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Lenovo ThinkPad T60/R60 series
	Flags: bus master, fast devsel, latency 0, IRQ 16
	Memory at ee100000 (32-bit, non-prefetchable) [size=512K]
	I/O ports at 1800 [size=8]
	Memory at d0000000 (32-bit, prefetchable) [size=256M]
	Memory at ee200000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915

It happened already a couple of times, I'm not yet sure about exact circumstances, last time it was a couple of minutes after waking up from suspend.