Comment 1 for bug 1307094

From Details:
Memory: 11.7 GiB
Processor: Intel® Core™ i7 CPU 965 @ 3.20GHz × 8
Graphics: Gallium 0.4 on AMD TAHITI
OS type: 64-bit
System up to date

From lspci -vv:
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] (prog-if 00 [VGA controller])
 Subsystem: PC Partner Limited / Sapphire Technology Device 3000
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 256 bytes
 Interrupt: pin A routed to IRQ 80
 Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
 Region 2: Memory at fba80000 (64-bit, non-prefetchable) [size=256K]
 Region 4: I/O ports at b000 [size=256]
 Expansion ROM at fbac0000 [disabled] [size=128K]
 Capabilities: <access denied>
 Kernel driver in use: radeon