Occasionally my whole screen locks up and I cannot even swith to the console and I find this in my syslog:

  *-display              
       description: VGA compatible controller
       product: Mullins [Radeon R3 Graphics]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 1
       bus info: pci@0000:00:01.0
       version: 45
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:37 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:3000(size=256) memory:f0c00000-f0c3ffff memory:f0c80000-f0c9ffff



Mar 10 12:30:12  kernel: [13319.636805] INFO: task Xorg:1501 blocked for more than 120 seconds.
Mar 10 12:30:12  kernel: [13319.636819]       Tainted: G        W  OE   4.4.0-173-generic #203-Ubuntu
Mar 10 12:30:12  kernel: [13319.636823] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 10 12:30:12  kernel: [13319.636829] Xorg            D ffff880214f1fb78     0  1501   1471 0x00000004
Mar 10 12:30:12  kernel: [13319.636841]  ffff880214f1fb78 0000000000000000 ffff880139987000 ffff880035021c00
Mar 10 12:30:12  kernel: [13319.636850]  ffff880214f20000 ffff880035021c00 ffff880035360030 ffffffff00000000
Mar 10 12:30:12  kernel: [13319.636858]  fffffffe00000001 ffff880214f1fb90 ffffffff818629d5 ffff880035360018
Mar 10 12:30:12  kernel: [13319.636866] Call Trace:
Mar 10 12:30:12  kernel: [13319.636885]  [<ffffffff818629d5>] schedule+0x35/0x80
Mar 10 12:30:12  kernel: [13319.636895]  [<ffffffff81865a43>] rwsem_down_write_failed+0x203/0x3b0
Mar 10 12:30:12  kernel: [13319.636909]  [<ffffffff8141bb13>] call_rwsem_down_write_failed+0x13/0x20
Mar 10 12:30:12  kernel: [13319.636918]  [<ffffffff8186524d>] ? down_write+0x2d/0x40
Mar 10 12:30:12  kernel: [13319.636980]  [<ffffffffc0281cbb>] radeon_gpu_reset+0x3b/0x350 [radeon]
Mar 10 12:30:12  kernel: [13319.637035]  [<ffffffffc029a990>] ? radeon_fence_default_wait+0x160/0x160 [radeon]
Mar 10 12:30:12  kernel: [13319.637047]  [<ffffffff815d45c6>] ? fence_wait_timeout+0x86/0x170
Mar 10 12:30:12  kernel: [13319.637108]  [<ffffffffc02b1c3e>] radeon_gem_handle_lockup.part.3+0xe/0x20 [radeon]
Mar 10 12:30:12  kernel: [13319.637169]  [<ffffffffc02b2b65>] radeon_gem_wait_idle_ioctl+0xe5/0x130 [radeon]
Mar 10 12:30:12  kernel: [13319.637216]  [<ffffffffc005f8fd>] drm_ioctl+0x16d/0x5b0 [drm]
Mar 10 12:30:12  kernel: [13319.637227]  [<ffffffff810942e1>] ? __set_task_blocked+0x41/0xa0
Mar 10 12:30:12  kernel: [13319.637288]  [<ffffffffc02b2a80>] ? radeon_gem_busy_ioctl+0xe0/0xe0 [radeon]
Mar 10 12:30:12  kernel: [13319.637298]  [<ffffffff8102e5d7>] ? do_signal+0x1b7/0x6f0
Mar 10 12:30:12  kernel: [13319.637347]  [<ffffffffc027f04c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
Mar 10 12:30:12  kernel: [13319.637358]  [<ffffffff8123268f>] do_vfs_ioctl+0x2af/0x4b0
Mar 10 12:30:12  kernel: [13319.637366]  [<ffffffff81232909>] SyS_ioctl+0x79/0x90
Mar 10 12:30:12  kernel: [13319.637375]  [<ffffffff8186735b>] entry_SYSCALL_64_fastpath+0x22/0xcb
Mar 10 12:30:12  kernel: [13319.637578] INFO: task kworker/u8:1:15955 blocked for more than 120 seconds.
Mar 10 12:30:12  kernel: [13319.637585]       Tainted: G        W  OE   4.4.0-173-generic #203-Ubuntu
Mar 10 12:30:12  kernel: [13319.637589] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 10 12:30:12  kernel: [13319.637593] kworker/u8:1    D ffff8800235b7a18     0 15955      2 0x00000000
Mar 10 12:30:12  kernel: [13319.637661] Workqueue: radeon-crtc radeon_flip_work_func [radeon]
Mar 10 12:30:12  kernel: [13319.637667]  ffff8800235b7a18 0000000000000001 ffff88021625aa00 ffff880139986200
Mar 10 12:30:12  kernel: [13319.637675]  ffff8800235b8000 ffff8800235b7b68 ffff880035360000 ffff8800235b7b00
Mar 10 12:30:12  kernel: [13319.637682]  ffff880035361498 ffff8800235b7a30 ffffffff818629d5 7fffffffffffffff
Mar 10 12:30:12  kernel: [13319.637690] Call Trace:
Mar 10 12:30:12  kernel: [13319.637700]  [<ffffffff818629d5>] schedule+0x35/0x80
Mar 10 12:30:12  kernel: [13319.637707]  [<ffffffff81865f94>] schedule_timeout+0x1b4/0x270
Mar 10 12:30:12  kernel: [13319.637767]  [<ffffffffc029b172>] ? radeon_fence_process+0x12/0x30 [radeon]
Mar 10 12:30:12  kernel: [13319.637822]  [<ffffffffc029b446>] radeon_fence_wait_seq_timeout.constprop.8+0x236/0x330 [radeon]
Mar 10 12:30:12  kernel: [13319.637832]  [<ffffffff810cbcf0>] ? wake_atomic_t_function+0x60/0x60
Mar 10 12:30:12  kernel: [13319.637887]  [<ffffffffc029b81f>] radeon_fence_wait+0x9f/0xe0 [radeon]
Mar 10 12:30:12  kernel: [13319.637964]  [<ffffffffc031b55b>] cik_ib_test+0xfb/0x2a0 [radeon]
Mar 10 12:30:12  kernel: [13319.638044]  [<ffffffffc035c8de>] radeon_ib_ring_tests+0x5e/0xc0 [radeon]
Mar 10 12:30:12  kernel: [13319.638094]  [<ffffffffc0281ed2>] radeon_gpu_reset+0x252/0x350 [radeon]
Mar 10 12:30:12  kernel: [13319.638154]  [<ffffffffc02acaf3>] radeon_flip_work_func+0x283/0x330 [radeon]
Mar 10 12:30:12  kernel: [13319.638162]  [<ffffffff8186249d>] ? __schedule+0x30d/0x810
Mar 10 12:30:12  kernel: [13319.638169]  [<ffffffff81862491>] ? __schedule+0x301/0x810
Mar 10 12:30:12  kernel: [13319.638175]  [<ffffffff8186249d>] ? __schedule+0x30d/0x810
Mar 10 12:30:12  kernel: [13319.638184]  [<ffffffff810a0d0b>] process_one_work+0x16b/0x4e0
Mar 10 12:30:12  kernel: [13319.638190]  [<ffffffff810a10ce>] worker_thread+0x4e/0x590
Mar 10 12:30:12  kernel: [13319.638197]  [<ffffffff810a1080>] ? process_one_work+0x4e0/0x4e0
Mar 10 12:30:12  kernel: [13319.638205]  [<ffffffff810a77b7>] kthread+0xe7/0x100
Mar 10 12:30:12  kernel: [13319.638212]  [<ffffffff81862491>] ? __schedule+0x301/0x810
Mar 10 12:30:12  kernel: [13319.638220]  [<ffffffff810a76d0>] ? kthread_create_on_node+0x1e0/0x1e0
Mar 10 12:30:12  kernel: [13319.638228]  [<ffffffff818677d2>] ret_from_fork+0x42/0x80
Mar 10 12:30:12  kernel: [13319.638235]  [<ffffffff810a76d0>] ? kthread_create_on_node+0x1e0/0x1e0
 

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