Comment 9 for bug 1574845

I tested with 4.6.0-040600rc6-generic but the problem persists. Making pause and play again in SMPlayes gives the following syslog output:

May 5 23:55:05 HOME kernel: [ 308.448015] radeon 0000:01:00.0: ring 5 stalled for more than 10000msec
May 5 23:55:05 HOME kernel: [ 308.448021] radeon 0000:01:00.0: GPU lockup (current fence id 0x0000000000000e02 last fence id 0x0000000000000e0b on ring 5)
May 5 23:55:05 HOME kernel: [ 308.482242] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
May 5 23:55:05 HOME kernel: [ 308.491775] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
May 5 23:55:05 HOME kernel: [ 308.493998] [drm] PCIE GART of 1024M enabled (table at 0x000000000025E000).
May 5 23:55:05 HOME kernel: [ 308.494017] radeon 0000:01:00.0: WB enabled
May 5 23:55:05 HOME kernel: [ 308.494020] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff880034aa6c00
May 5 23:55:05 HOME kernel: [ 308.494023] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff880034aa6c0c
May 5 23:55:05 HOME kernel: [ 308.494409] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c598 and cpu addr 0xffffc9000181c598
May 5 23:55:05 HOME kernel: [ 308.540202] [drm] ring test on 0 succeeded in 1 usecs
May 5 23:55:05 HOME kernel: [ 308.540208] [drm] ring test on 3 succeeded in 2 usecs
May 5 23:55:06 HOME kernel: [ 308.714841] [drm] ring test on 5 succeeded in 1 usecs
May 5 23:55:06 HOME kernel: [ 308.714847] [drm] UVD initialized successfully.
May 5 23:55:06 HOME kernel: [ 308.919526] [drm] ib test on ring 0 succeeded in 0 usecs
May 5 23:55:06 HOME kernel: [ 308.919554] [drm] ib test on ring 3 succeeded in 0 usecs
May 5 23:55:07 HOME kernel: [ 310.068059] [drm:uvd_v1_0_ib_test [radeon]] *ERROR* radeon: fence wait timed out.
May 5 23:55:07 HOME kernel: [ 310.068089] [drm:radeon_ib_ring_tests [radeon]] *ERROR* radeon: failed testing IB on ring 5 (-110).

and makes X freeze.