Comment 60 for bug 312133

Seen today in dmesg (after last driver update) (Hope it will help):

[ 207.896089] ------------[ cut here ]------------
[ 207.896097] WARNING: at /build/buildd/linux-2.6.28/drivers/gpu/drm/i915/i915_gem.c:2475 i915_gem_idle+0x2ec/0x310 [i915]()
[ 207.896103] Modules linked in: nls_iso8859_1 nls_cp437 binfmt_misc i915 drm ppdev bridge stp bnep vboxnetflt vboxdrv input_polldev video output vfat fat lp parport joydev snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm usbhid snd_seq_dummy psmouse serio_raw pcspkr iTCO_wdt iTCO_vendor_support usblp snd_seq_oss snd_seq_midi wacom snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd intel_agp soundcore snd_page_alloc r8169 mii usb_storage fbcon tileblit font bitblit softcursor
[ 207.896186] Pid: 3066, comm: Xorg Not tainted 2.6.28-11-generic #40-Ubuntu
[ 207.896191] Call Trace:
[ 207.896207] [<ffffffff802509bf>] warn_on_slowpath+0x5f/0x90
[ 207.896222] [<ffffffffa0459fe4>] ? i915_gem_retire_requests+0x114/0x170 [i915]
[ 207.896234] [<ffffffffa045c11c>] i915_gem_idle+0x2ec/0x310 [i915]
[ 207.896246] [<ffffffffa045c193>] i915_gem_leavevt_ioctl+0x23/0x50 [i915]
[ 207.896265] [<ffffffffa04377fa>] drm_ioctl+0x10a/0x330 [drm]
[ 207.896274] [<ffffffff8021bb70>] ? restore_i387_xstate+0x120/0x150
[ 207.896287] [<ffffffffa045c170>] ? i915_gem_leavevt_ioctl+0x0/0x50 [i915]
[ 207.896296] [<ffffffff802f631d>] vfs_ioctl+0x7d/0xa0
[ 207.896303] [<ffffffff802f6685>] do_vfs_ioctl+0x75/0x230
[ 207.896310] [<ffffffff802f68d9>] sys_ioctl+0x99/0xa0
[ 207.896317] [<ffffffff8021253a>] system_call_fastpath+0x16/0x1b
[ 207.896322] ---[ end trace 8091fc89fedda383 ]---