X crashing intermitently on i945GZ chipset

[pauld]

I had tried Acorn 2010 rc1b(I think) for about 3 days.

I had/have (well, since I reinstalled this morning, I spent about 2 hours without problem) a problem, where intermittenly (about 1 to 4 times an hour), X would crash. Normally, the gdm like program TinyMe use, sorry forgot it's name, relaunch X and relaunch login screen.

I tried to read logs but did not found much except for:
DRI not enabled because was not finding some DRI related file, so was using software acceleration. Or was it no EXA acceleration? not sure any more. But it was saying it was using software acceleration rather than hardware one.

Xorg.1.log was ending with:
---
Backtrace:

Backtrace:
---
But there was no backtrace in it.

I tried to disable the relaunching of X, because I was hoping to see backtrace in console terminal, but then, I get no video at all after X crashing, and my monitor goes 'offline', so I can't see the console at all after crash, and had to manually shutdown computer.

I began to connect the computer to an other old one, with a null-modem serial cable, I was hoping to get some debug info just by booting, but I suppose I need to change some /etc files to enable a serial console.

Well, I tried Minix 3 after that, and broke my TinyMe installation.

But now, I have reinstalled it. After installing my ESS 56k modem driver, and doing the update, I saw it wanted to update x86_l1 and downgrade corn... something, the program to see the ressources on the desktop.

I chosen to lock x86_l1 update this time.
I test it about 1h30 without having problems this time.

Will install Chromium and see how it goes.

Edit:
Well, not long after installing Chromium, I got the X crashing once again.
There is no .xsesion-errors anymore?
[root@localhost ~]# tail /var/log/Xorg.0.log.old
(**) PS/2 Generic Mouse: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "PS/2 Generic Mouse" (type: MOUSE)
(**) PS/2 Generic Mouse: (accel) keeping acceleration scheme 1
(**) PS/2 Generic Mouse: (accel) acceleration profile 0
(II) PS/2 Generic Mouse: initialized for relative axes.
(II) XKB: reuse xkmfile /usr/share/X11/xkb/compiled/server-0F160488F94B203BAE48320218F56975D7F7F741.xkm

Backtrace:

Backtrace:
[root@localhost ~]#
[root@localhost ~]# cat /var/log/Xorg.0.log.old | grep WW
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) Falling back to old probe method for vesa
(WW) Falling back to old probe method for fbdev
(WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[root@localhost ~]#

[root@localhost ~]# cat /var/log/Xorg.0.log.old | grep EE
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(II) Loading extension MIT-SCREEN-SAVER
(EE) AIGLX error: dlopen of /usr/lib/dri/i915_dri.so failed (/usr/lib/dri/i915_dri.so: cannot open shared object file: No such file or directory)
(EE) AIGLX: reverting to software rendering
(EE) AIGLX error: dlopen of /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory)
(EE) GLX: could not load software renderer
[root@localhost ~]#

[root@localhost ~]# dmesg
Linux version 2.6.31.12-unity2.lgc (unity@xpc) (gcc version 4.4.2 (GCC) ) #1 SMP Wed Mar 3 07:39:32 EST 2010
KERNEL supported cpus:
...
Detected 2666.775 MHz processor.
Console: colour dummy device 80x25
console [tty0] enabled
hpet clockevent registered
...
...
i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
i915 0000:00:02.0: setting latency timer to 64
fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
Console: switching to colour dummy device 80x25
iounmap: bad address f86ea000
Pid: 34, comm: modprobe Not tainted 2.6.31.12-unity2.lgc #1
Call Trace:
[<c046edab>] ? printk+0x28/0x3d
[<c012d1c3>] iounmap+0xc3/0xd0
[<c0309b98>] vesafb_destroy+0x28/0x60
[<c02f03e3>] unregister_framebuffer+0xf3/0x120
[<c02f113b>] register_framebuffer+0xdb/0x2e0
[<f8a53404>] ? drm_mode_create+0x54/0xc0 [drm]
[<f8b6e389>] intelfb_probe+0x5f9/0x6a0 [i915]
[<f8a55efa>] drm_helper_initial_config+0x4a/0x1b0 [drm]
[<f8b4ee5c>] i915_driver_load+0xe7c/0xff0 [i915]
[<f8a4b9ac>] drm_get_dev+0x2bc/0x4c0 [drm]
[<f8b73bb0>] i915_pci_probe+0x21/0x181 [i915]
[<c02db672>] local_pci_probe+0x22/0x40
[<c02dc7f0>] pci_device_probe+0x80/0xb0
[<c0374dc8>] driver_probe_device+0x88/0x290
[<c02db924>] ? pci_match_device+0xc4/0xe0
[<c0375061>] __driver_attach+0x91/0xa0
[<c0374fd0>] ? __driver_attach+0x0/0xa0
[<c0374008>] bus_for_each_dev+0x58/0x90
[<c0374b39>] driver_attach+0x29/0x50
[<c0374fd0>] ? __driver_attach+0x0/0xa0
[<c03744cf>] bus_add_driver+0x20f/0x330
[<c02dc6c0>] ? pci_device_remove+0x0/0x70
[<c0375405>] driver_register+0x75/0x140
[<c01b7deb>] ? trace_module_notify+0x3b/0x390
[<c01a307a>] ? ftrace_convert_nops+0x14a/0x260
[<f8b6a4d9>] ? intel_sdvo_create_preferred_input_timing+0x9/0xd0 [i915]
[<c02dca6e>] __pci_register_driver+0x4e/0xd0
[<f8a46717>] drm_init+0x107/0x110 [drm]
[<f85e7054>] i915_init+0x54/0x67 [i915]
[<c010115c>] do_one_initcall+0x3c/0x1e0
[<f85e7000>] ? i915_init+0x0/0x67 [i915]
[<c018124e>] sys_init_module+0xde/0x220
[<c01ff408>] ? sys_read+0x58/0xa0
[<c01041cc>] syscall_call+0x7/0xb
[drm] DAC-6: set mode 1280x1024 f
Console: switching to colour frame buffer device 93x31
[drm] fb0: inteldrmfb frame buffer device
[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
...
PPP: VJ decompression error
[drm:i915_gem_object_bind_to_gtt] *ERROR* Invalid object alignment requested 4096
chrome[2791]: segfault at 54d051cd ip b67cee6a sp b44fc8b4 error 4 in libc-2.11.so[b6764000+15e000]
[drm] DAC-6: set mode 1280x1024 12
ess(240): ESS initialization. Country code is 0.
...
[root@localhost ~]#

Attaching full dmesg output.

Is there debug packages I could install to get source code of the Backtrace?