Ubuntu desktop occasionally got frozen.

[Starry Sky]

Hi,

Occasionally my PC get frozen.  Keyboard, mouse and all other input devices
lost efficiency.

My ubuntu version is 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:48:51
UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

I find the following lines from syslog.

2107 Mar 26 19:04:40 starrysky kernel: [11075.527808] ------------[ cut
here ]------------
2108 Mar 26 19:04:40 starrysky kernel: [11075.527824] WARNING: at
/build/buildd/linux-3.0.0/drivers/gpu/drm/i915/i915_drv.c:365
gen6_gt_force_wake_put+0x4b/0x50 [i915]()
2109 Mar 26 19:04:40 starrysky kernel: [11075.527829] Hardware name:
Latitude E6220
2110 Mar 26 19:04:40 starrysky kernel: [11075.527832] Modules linked in:
bnep rfcomm vmnet vsock vmci vmmon binfmt_misc snd_hda_codec_hdmi
snd_hda_codec_idt joydev wl(P) lib8     0211 bcma arc4 dell_wmi
sparse_keymap ppdev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
dell_laptop dcdbas snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq
btusb sn     d_timer uvcvideo snd_seq_device videodev v4l2_compat_ioctl32
psmouse serio_raw bluetooth parport_pc snd wmi brcmsmac(C) brcmutil(C)
mac80211 soundcore mei(C) i915 snd_pa     ge_alloc cfg80211 drm_kms_helper
crc_ccitt drm i2c_algo_bit video lp parport usbhid hid sdhci_pci sdhci
e1000e ahci libahci
2111 Mar 26 19:04:40 starrysky kernel: [11075.527910] Pid: 0, comm:
kworker/0:1 Tainted: P        WC  3.0.0-16-generic #29-Ubuntu
2112 Mar 26 19:04:40 starrysky kernel: [11075.527915] Call Trace:
2113 Mar 26 19:04:40 starrysky kernel: [11075.527917]  <IRQ>
 [<ffffffff8105e8ff>] warn_slowpath_common+0x7f/0xc0
2114 Mar 26 19:04:40 starrysky kernel: [11075.527932]  [<ffffffff8105e95a>]
warn_slowpath_null+0x1a/0x20
2115 Mar 26 19:04:40 starrysky kernel: [11075.527950]  [<ffffffffa00fa91b>]
gen6_gt_force_wake_put+0x4b/0x50 [i915]
2116 Mar 26 19:04:40 starrysky kernel: [11075.527969]  [<ffffffffa0105927>]
i915_hangcheck_elapsed+0xe7/0x3f0 [i915]
2117 Mar 26 19:04:40 starrysky kernel: [11075.527977]  [<ffffffff81011673>]
? native_sched_clock+0x13/0x80
2118 Mar 26 19:04:40 starrysky kernel: [11075.527985]  [<ffffffff8107a3a0>]
? __queue_work+0x320/0x320
2119 Mar 26 19:04:40 starrysky kernel: [11075.528003]  [<ffffffffa0105840>]
? i915_vblank_swap+0x10/0x10 [i915]
2120 Mar 26 19:04:40 starrysky kernel: [11075.528022]  [<ffffffffa0105840>]
? i915_vblank_swap+0x10/0x10 [i915]
2121 Mar 26 19:04:40 starrysky kernel: [11075.528031]  [<ffffffff8106d736>]
call_timer_fn+0x46/0x160
2122 Mar 26 19:04:40 starrysky kernel: [11075.528049]  [<ffffffffa0105840>]
? i915_vblank_swap+0x10/0x10 [i915]
2123 Mar 26 19:04:40 starrysky kernel: [11075.528055]  [<ffffffff8106f062>]
run_timer_softirq+0x132/0x2a0
2124 Mar 26 19:04:40 starrysky kernel: [11075.528063]  [<ffffffff810270cd>]
? lapic_next_event+0x1d/0x30
2125 Mar 26 19:04:40 starrysky kernel: [11075.528070]  [<ffffffff810660f8>]
__do_softirq+0xa8/0x210
2126 Mar 26 19:04:40 starrysky kernel: [11075.528077]  [<ffffffff81093a2f>]
? tick_program_event+0x1f/0x30
2127 Mar 26 19:04:40 starrysky kernel: [11075.528086]  [<ffffffff815fc41c>]
call_softirq+0x1c/0x30
2128 Mar 26 19:04:40 starrysky kernel: [11075.528091]  [<ffffffff8100c2d5>]
do_softirq+0x65/0xa0
2129 Mar 26 19:04:40 starrysky kernel: [11075.528098]  [<ffffffff810664de>]
irq_exit+0x8e/0xb0
2130 Mar 26 19:04:40 starrysky kernel: [11075.528106]  [<ffffffff815fcd5e>]
smp_apic_timer_interrupt+0x6e/0x99
2131 Mar 26 19:04:40 starrysky kernel: [11075.528114]  [<ffffffff815fbbd3>]
apic_timer_interrupt+0x13/0x20
2132 Mar 26 19:04:40 starrysky kernel: [11075.528118]  <EOI>
 [<ffffffff81032a79>] ? default_spin_lock_flags+0x9/0x10
2133 Mar 26 19:04:40 starrysky kernel: [11075.528128]  [<ffffffff8134b1bb>]
? intel_idle+0xcb/0x120
2134 Mar 26 19:04:40 starrysky kernel: [11075.528134]  [<ffffffff8134b19d>]
? intel_idle+0xad/0x120
2135 Mar 26 19:04:40 starrysky kernel: [11075.528143]  [<ffffffff814b37ad>]
cpuidle_idle_call+0x9d/0x280
2136 Mar 26 19:04:40 starrysky kernel: [11075.528151]  [<ffffffff8100920b>]
cpu_idle+0xab/0x100
2137 Mar 26 19:04:40 starrysky kernel: [11075.528159]  [<ffffffff815d52a9>]
start_secondary+0xd9/0xdb
2138 Mar 26 19:04:40 starrysky kernel: [11075.528165] ---[ end trace
9468e25daafefa01 ]---

Could anybody help me to find out what happened?
Thanks in advance!
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