It seems i915 driver loads fail.

mlin@wsm:~$ dmesg |grep -i i915
i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
i915 0000:00:02.0: setting latency timer to 64
i915 0000:00:02.0: irq 47 for MSI/MSI-X
WARNING: at /linux-2.6/drivers/gpu/drm/i915/intel_display.c:826 assert_fdi_tx+0xcc/0xd8()
 [<ffffffff8133d865>] i915_driver_load+0xb12/0x10e9
 [<ffffffff816a891a>] i915_pci_probe+0x1b/0x1d
 [<ffffffff81d12264>] i915_init+0x8b/0x8d
WARNING: at /linux-2.6/drivers/gpu/drm/i915/intel_display.c:826 assert_fdi_tx+0xcc/0xd8()
 [<ffffffff8133d865>] i915_driver_load+0xb12/0x10e9
 [<ffffffff816a891a>] i915_pci_probe+0x1b/0x1d
 [<ffffffff81d12264>] i915_init+0x8b/0x8d
[drm:i915_driver_load] *ERROR* failed to init modeset
i915 0000:00:02.0: PCI INT A disabled
i915: probe of 0000:00:02.0 failed with error -5
 [<ffffffff81355191>] i915_gem_inactive_shrink+0x2b/0x18d


The fault message as below.
See the attachments for full dmesg, kernel config and lspci output.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000060
IP: [<ffffffff816d4422>] mutex_trylock+0x61/0x131
PGD 133cd5067 PUD 134301067 PMD 0
Oops: 0002 [#1] SMP
CPU 3
Modules linked in:

Pid: 2322, comm: bash Tainted: G        W   3.0.0-rc6-tip-mlin+ #571 Intel To be filled by O.E.M./To be filled by O.E.M.
RIP: 0010:[<ffffffff816d4422>]  [<ffffffff816d4422>] mutex_trylock+0x61/0x131
RSP: 0018:ffff8801347add98  EFLAGS: 00010002
RAX: 0000000000000100 RBX: 0000000000000058 RCX: 0000000000000000
RDX: 000000000000faf9 RSI: ffffffff816d441d RDI: ffffffff81061c5f
RBP: ffff8801347addc8 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000082 R12: 0000000000000000
R13: 0000000000000246 R14: 0000000000000000 R15: 0000000000000058
FS:  00007f6831242700(0000) GS:ffff88013bcc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000060 CR3: 0000000133d0e000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process bash (pid: 2322, threadinfo ffff8801347ac000, task ffff880136b8dfa0)
Stack:
 ffff8801347ade78 00000000000013ec 0000000000000000 ffff880136a978a0
 0000000000000000 00000000000013ec ffff8801347ade18 ffffffff81355191
 ffff8801347ade28 ffff8801347adde8 ffff8801347adde8 ffff880136a978a0
Call Trace:
 [<ffffffff81355191>] i915_gem_inactive_shrink+0x2b/0x18d
 [<ffffffff810b09ec>] shrink_slab+0x80/0x16d
 [<ffffffff810fe4bc>] drop_caches_sysctl_handler+0x64/0x74
 [<ffffffff81129532>] proc_sys_call_handler.isra.3+0x81/0xaf
 [<ffffffff81129573>] proc_sys_write+0x13/0x15
 [<ffffffff810ddf4c>] vfs_write+0xa9/0x119
 [<ffffffff810de183>] sys_write+0x45/0x6c
 [<ffffffff816dc87b>] system_call_fastpath+0x16/0x1b
Code: c0 74 1a 83 3d 37 e7 f4 00 00 75 11 be b3 01 00 00 48 c7 c7 01 ad a9 81 e8 06 34 96 ff 9c 41 5d fa e8 35 d8 98 ff b8 00 01 00 00 <f0> 66 0f c1 43 08 38 e0 74 07 f3 90 8a 43 08 eb f5 83 3d c6 df
RIP  [<ffffffff816d4422>] mutex_trylock+0x61/0x131
 RSP <ffff8801347add98>
CR2: 0000000000000060
---[ end trace c42b3162041571d6 ]---
                                                                                   998,1         Bot