Comment 14 for bug 881526

I have the same issue on ZT AMD FX-8120 Desktop using HD TV over HDMI as a monitor, able to login through ssh.
OS: Ubuntu 12.04 LTS
$ uname -a
Linux nanna-GA-880GM-USB3 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

lspci:
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks [Radeon HD 6570] (prog-if 00 [VGA controller])

kern.log:
May 5 14:49:55 nanna-GA-880GM-USB3 kernel: [ 2157.704051] HDMI status: Codec=0 Pin=3 Presence_Detect=1 ELD_Valid=1
May 5 14:49:59 nanna-GA-880GM-USB3 kernel: [ 2161.786535] HDMI hot plug event: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=0
May 5 14:49:59 nanna-GA-880GM-USB3 kernel: [ 2161.786561] HDMI status: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=0
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276008] [fglrx] ASIC hang happened
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276013] Pid: 1130, comm: Xorg Tainted: P O 3.2.0-24-generic #37-Ubuntu
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276016] Call Trace:
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276072] [<ffffffffa00abffe>] KCL_DEBUG_OsDump+0xe/0x10 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276102] [<ffffffffa00b958c>] firegl_hardwareHangRecovery+0x1c/0x50 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276158] [<ffffffffa0155119>] ? _ZN4Asic9WaitUntil15ResetASICIfHungEv+0x9/0x10 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276212] [<ffffffffa01550bc>] ? _ZN4Asic9WaitUntil15WaitForCompleteEv+0x9c/0xf0 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276266] [<ffffffffa014fbbe>] ? _ZN15ExecutableUnits10CPRingIdleE15idle_WaitMethod12_QS_CP_RING_+0x11e/0x1e0 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276322] [<ffffffffa014fa4c>] ? _ZN15ExecutableUnits7PM4idleE15idle_WaitMethod+0x4c/0x90 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276374] [<ffffffffa0145c71>] ? _ZN15QS_PRIVATE_CORE9QsPM4idleE15idle_WaitMethod+0x31/0x60 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276422] [<ffffffffa013074e>] ? _ZN10QS_PRIVATE11synchronizeEv+0xce/0xe0 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276473] [<ffffffffa013a0f5>] ? _Z8uCWDDEQCmjjPvjS_+0x3b5/0x10c0 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276479] [<ffffffff810903fe>] ? down+0x2e/0x50
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276512] [<ffffffffa00d9b6f>] ? firegl_cmmqs_CWDDE_32+0x36f/0x480 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276545] [<ffffffffa00d82de>] ? firegl_cmmqs_CWDDE32+0x6e/0x100 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276550] [<ffffffff8129ce01>] ? security_capable+0x21/0x30
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276582] [<ffffffffa00d8270>] ? firegl_cmmqs_createdriver+0x170/0x170 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276610] [<ffffffffa00b512d>] ? firegl_ioctl+0x1ed/0x250 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276635] [<ffffffffa00a59be>] ? ip_firegl_unlocked_ioctl+0xe/0x20 [fglrx]
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276639] [<ffffffff81189cfa>] ? do_vfs_ioctl+0x8a/0x340
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276643] [<ffffffff81177e0d>] ? vfs_read+0x10d/0x180
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276647] [<ffffffff8118a041>] ? sys_ioctl+0x91/0xa0
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276651] [<ffffffff81664a82>] ? system_call_fastpath+0x16/0x1b
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276655] pubdev:0xffffffffa0353320, num of device:1 , name:fglrx, major 8, minor 96.
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276659] device 0 : 0xffff8804007d0000 .
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276661] Asic ID:0x6759, revision:0x28, MMIOReg:0xffffc90013200000.
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276664] FB phys addr: 0xd0000000, MC :0xf00000000, Total FB size :0x40000000.
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276667] gart table MC:0xf0f8fd000, Physical:0xdf8fd000, size:0x402000.
May 5 14:57:20 nanna-GA-880GM-USB3 kernel: [ 2603.276670] mc_node :FB, total 1 zones