Oops LXDE Raspberry Pi (Logout Action)

[  235.030033] kernel BUG at drivers/video/bcm2708_fb.c:251!
[  235.055009] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[  235.063183] pgd = c94ec000
[  235.074978] [00000000] *pgd=00000000
[  235.078660] Internal error: Oops: 805 [#1] PREEMPT

Entering kdb (current=0xcac212e0, pid 2046) Oops: (null)
due to oops @ 0xc0012150

Pid: 2046, comm:                 Xorg
CPU: 0    Tainted: G        W    (3.1.9+ #149)
PC is at __bug+0x2c/0x38
LR is at __schedule+0x320/0x670
pc : [<c0012150>]    lr : [<c03fcb50>]    psr: 60000113
sp : caf81b10  ip : c05ca008  fp : caf81b1c
r10: 000005a0  r9 : cb8e5424  r8 : 00000010
r7 : caf81b3c  r6 : 00000000  r5 : ffdff000  r4 : cb8e5400
r3 : 00000000  r2 : 0942b081  r1 : 00000000  r0 : 00000043
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 00c5387d  Table: 094ec008  DAC: 00000015
[<c000f804>] (show_regs+0x0/0x58) from [<c0083554>] (kdb_dumpregs+0x38/0x60)
 r4:c0630af8 r3:00000001
[<c008351c>] (kdb_dumpregs+0x0/0x60) from [<c00862c4>] (kdb_main_loop+0x56c/0x7ac)
 r6:00000005 r5:caf81ac8 r4:c0630d04 r3:0942b081
[<c0085d58>] (kdb_main_loop+0x0/0x7ac) from [<c0088c78>] (kdb_stub+0x280/0x3f8)
[<c00889f8>] (kdb_stub+0x0/0x3f8) from [<c007f1bc>] (kgdb_handle_exception+0x154/0x6bc)
[<c007f068>] (kgdb_handle_exception+0x0/0x6bc) from [<c0014a20>] (kgdb_notify+0x3c/0x74)
[<c00149e4>] (kgdb_notify+0x0/0x74) from [<c0401820>] (notifier_call_chain+0x54/0x94)
 r6:00000000 r5:00000000 r4:fffffffc r3:c00149e4
[<c04017cc>] (notifier_call_chain+0x0/0x94) from [<c04018ac>] (__atomic_notifier_call_chain+0x4c/0x84)
 r8:cac212e0 r7:00000001 r6:caf8188c r5:ffffffff r4:c061c1f8
r3:ffffffffmore>
[<c0401860>] (__atomic_notifier_call_chain+0x0/0x84) from [<c040190c>] (atomic_notifier_call_chain+0x28/0x30)
 r7:00000805 r6:c04d5904 r5:caf81ac8 r4:caf80000
[<c04018e4>] (atomic_notifier_call_chain+0x0/0x30) from [<c0401954>] (notify_die+0x40/0x4c)
[<c0401914>] (notify_die+0x0/0x4c) from [<c0012570>] (die+0xb8/0x388)
[<c00124b8>] (die+0x0/0x388) from [<c0019054>] (__do_kernel_fault+0x74/0x94)
[<c0018fe0>] (__do_kernel_fault+0x0/0x94) from [<c040134c>] (do_page_fault+0x80/0x3ac)
 r8:c94bf7b0 r7:00000805 r6:00000000 r5:cac860c0 r4:caf81ac8
r3:caf81ac8more>
[<c04012cc>] (do_page_fault+0x0/0x3ac) from [<c0401724>] (do_translation_fault+0xac/0xb4)
[<c0401678>] (do_translation_fault+0x0/0xb4) from [<c000836c>] (do_DataAbort+0x40/0xa8)
 r7:00000005 r6:c05cf8f4 r5:00000000 r4:00000805
[<c000832c>] (do_DataAbort+0x0/0xa8) from [<c03ff7bc>] (__dabt_svc+0x3c/0x60)
Exception stack(0xcaf81ac8 to 0xcaf81b10)
1ac0:                   00000043 00000000 0942b081 00000000 cb8e5400 ffdff000
1ae0: 00000000 caf81b3c 00000010 cb8e5424 000005a0 caf81b1c c05ca008 caf81b10
1b00: c03fcb50 c0012150 60000113 ffffffff
 r8:00000010 r7:caf81afc r6:ffffffff r5:60000113 r4:c0012150
[<c0012124>] (__bug+0x0/0x38) from [<c0274338>] (bcm2708_fb_set_par+0x190/0x19c)
[<c02741a8>] (bcm2708_fb_set_par+0x0/0x19c) from [<c02663f8>] (fb_set_var+0x140/0x2b0)
[<c02662b8>] (fb_set_var+0x0/0x2b0) from [<c026d9d0>] (fbcon_blank+0x1c0/0x290)
[<c026d810>] (fbcon_blank+0x0/0x290) from [<c028d870>] (do_unblank_screen+0xa4/0x1cc)
[<c028d7cc>] (do_unblank_screen+0x0/0x1cc) from [<c028511c>] (vt_ioctl+0x2008/0x204c)
 r6:00000006 r5:caf87800 r4:00000000 r3:c05fa658
[<c0283114>] (vt_ioctl+0x0/0x204c) from [<c02789cc>] (tty_ioctl+0x198/0xbf0)
[<c0278834>] (tty_ioctl+0x0/0xbf0) from [<c01082dc>] (do_vfs_ioctl+0x8c/0x5f0)
[<c0108250>] (do_vfs_ioctl+0x0/0x5f0) from [<c0108888>] (sys_ioctl+0x48/0x70)
[<c0108840>] (sys_ioctl+0x0/0x70) from [<c000e140>] (ret_fast_syscall+0x0/0x48)
 r7:00000036 r6:401ee000 r5:00000000 r4:401f2320