Hi,
I encounter the same problem on a Sony Vaio (SZ4MN) with i945GM.
lspci -v
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
Subsystem: Sony Corporation Device 81e6
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at f8300000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 1800 [size=8]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at f8400000 (32-bit, non-prefetchable) [size=256K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
The output in /var/log/message is :
Oct 13 09:42:05 franck-laptop kernel: [ 447.870056] i2c-adapter i2c-1: unable
to read EDID block.
Oct 13 09:42:05 franck-laptop kernel: [ 447.870061] i915 0000:00:02.0:
LVDS-1: no EDID data
Oct 13 09:42:05 franck-laptop kernel: [ 447.911682] [drm] TV-12: set mode
NTSC 480i 0
Oct 13 09:42:05 franck-laptop kernel: [ 448.054970] [drm] TV-12: set mode
NTSC 480i 0
Oct 13 09:42:05 franck-laptop kernel: [ 448.303017] [drm] DAC-6: set mode 17
Oct 13 09:42:05 franck-laptop kernel: [ 600.630104] i915/1 D
0000000000000000 0 356 2 0x00000000
Oct 13 09:42:05 franck-laptop kernel: [ 600.630114] ffff8800798fdd70
0000000000000046 0000000000000000 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630123] ffff88007a3347c0
0000000000015580 0000000000015580 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630131] 0000000000015580
ffff88007a3347c0 0000000000015580 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630139] Call Trace:
Oct 13 09:42:05 franck-laptop kernel: [ 600.630154] [<ffffffff81523387>]
__mutex_lock_slowpath+0xd7/0x160
Oct 13 09:42:05 franck-laptop kernel: [ 600.630161] [<ffffffff81523286>]
mutex_lock+0x26/0x50
Oct 13 09:42:05 franck-laptop kernel: [ 600.630201] [<ffffffffa00a08d8>]
i915_gem_retire_work_handler+0x38/0x90 [i915]
Oct 13 09:42:05 franck-laptop kernel: [ 600.630223] [<ffffffffa00a08a0>] ?
i915_gem_retire_work_handler+0x0/0x90 [i915]
Oct 13 09:42:05 franck-laptop kernel: [ 600.630232] [<ffffffff8106f725>]
run_workqueue+0x95/0x170
Oct 13 09:42:05 franck-laptop kernel: [ 600.630239] [<ffffffff8106f8a4>]
worker_thread+0xa4/0x120
Oct 13 09:42:05 franck-laptop kernel: [ 600.630246] [<ffffffff81074ab0>] ?
autoremove_wake_function+0x0/0x40
Oct 13 09:42:05 franck-laptop kernel: [ 600.630252] [<ffffffff8106f800>] ?
worker_thread+0x0/0x120
Oct 13 09:42:05 franck-laptop kernel: [ 600.630258] [<ffffffff810746c6>]
kthread+0xa6/0xb0
Oct 13 09:42:05 franck-laptop kernel: [ 600.630266] [<ffffffff8101308a>]
child_rip+0xa/0x20
Oct 13 09:42:05 franck-laptop kernel: [ 600.630272] [<ffffffff81074620>] ?
kthread+0x0/0xb0
Oct 13 09:42:05 franck-laptop kernel: [ 600.630278] [<ffffffff81013080>] ?
child_rip+0x0/0x20
Oct 13 09:42:05 franck-laptop kernel: [ 600.630307] Xorg D
0000000000000000 0 1110 1085 0x00400004
Oct 13 09:42:05 franck-laptop kernel: [ 600.630315] ffff880076debcb8
0000000000000082 ffff880076debc90 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630323] ffff880076dc9a60
0000000000015580 0000000000015580 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630331] 0000000000015580
ffff880076dc9a60 0000000000015580 0000000000015580
Oct 13 09:42:05 franck-laptop kernel: [ 600.630339] Call Trace:
Oct 13 09:42:05 franck-laptop kernel: [ 600.630346] [<ffffffff81523387>]
__mutex_lock_slowpath+0xd7/0x160
Oct 13 09:42:05 franck-laptop kernel: [ 600.630355] [<ffffffff814240a0>] ?
sock_aio_write+0x0/0x150
Oct 13 09:42:05 franck-laptop kernel: [ 600.630361] [<ffffffff81523286>]
mutex_lock+0x26/0x50
Oct 13 09:42:05 franck-laptop kernel: [ 600.630382] [<ffffffffa00a0bc6>]
i915_gem_throttle_ioctl+0x36/0x90 [i915]
Oct 13 09:42:05 franck-laptop kernel: [ 600.630414] [<ffffffffa0066cae>]
drm_ioctl+0x17e/0x3a0 [drm]
Oct 13 09:42:05 franck-laptop kernel: [ 600.630423] [<ffffffff81032419>] ?
default_spin_lock_flags+0x9/0x10
--
[i945gme] attaching external monitor: laptop display is black, external monitor
too, with frozen mouse coursor
https://bugs.launchpad.net/bugs/419328
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which is the registrant for xf86-video-intel.
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