http://bugzilla.kernel.org/show_bug.cgi?id=13911
Summary: High IRQ latencies with AMD C1E enabled
Product: ACPI
Version: 2.5
Kernel Version: 2.6.30.4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: acpi_power-proces...@kernel-bugs.osdl.org
ReportedBy: be...@bi-co.net
Regression: No
My PCI tv card (Pinnacle PCTV) stops working correctly when AMD C1E support ist
activated in BIOS and kernel is booted with ACPI support.
dmesg shows the following:
bttv0: timeout: drop=11 irq=50/50, risc=cfb5901c, bits: OFLOW
bttv0: timeout: drop=23 irq=104/104, risc=cf4f3bb4, bits: HSYNC OFLOW
bttv0: timeout: drop=34 irq=143/143, risc=cfa8dbb4, bits: HSYNC OFLOW
bttv0: timeout: drop=45 irq=183/183, risc=cf4f4bb4, bits: HSYNC OFLOW
and so on...
And here are some debug information:
bttv0: irq: skipped frame
[main=cf6a2000,o_vbi=cf6a2018,o_field=cfac6000,rc=cfac601c]
bttv0: Uhm. Looks like we have unusual high IRQ latencies.
bttv0: Lets try to catch the culpit red-handed ...
Pid: 0, comm: swapper Tainted: P 2.6.30-ARCH #1
Call Trace:
<IRQ> [<ffffffffa0f2b6a7>] ? bttv_irq+0x3c7/0x930 [bttv]
[<ffffffff802708cb>] ? hrtimer_get_next_event+0xcb/0x120
[<ffffffff8025ce75>] ? get_next_timer_interrupt+0x1d5/0x250
[<ffffffff802a3c5b>] ? handle_IRQ_event+0x6b/0x210
[<ffffffff8027127c>] ? ktime_get+0x1c/0x70
[<ffffffff802a6192>] ? handle_fasteoi_irq+0x92/0x120
[<ffffffff8020fa89>] ? handle_irq+0x29/0x50
[<ffffffff8020f0e2>] ? do_IRQ+0x72/0x110
[<ffffffff8020ce53>] ? ret_from_intr+0x0/0x11
<EOI> [<ffffffff80225400>] ? lapic_next_event+0x0/0x50
[<ffffffff8022e512>] ? native_safe_halt+0x2/0x10
[<ffffffff8021619a>] ? default_idle+0x5a/0x180
[<ffffffff8027b07a>] ? clockevents_notify+0x3a/0xc0
[<ffffffff80216608>] ? c1e_idle+0x68/0x150
[<ffffffff8020b52a>] ? cpu_idle+0xba/0x120
lspci -vvv of the device:
04:05.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture
(rev 11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 64 (4000ns min, 10000ns max)
Interrupt: pin A routed to IRQ 20
Region 0: Memory at f6ffe000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
No end tag found
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel driver in use: bttv
Kernel modules: bttv
04:05.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev
11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver, audio
section)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 64 (1000ns min, 63750ns max)
Interrupt: pin A routed to IRQ 10
Region 0: Memory at f6fff000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
No end tag found
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
When I disable C1E support in BIOS or boot with acpi=off parameter, everything
works fine.
My System:
AMD Phenom II X4 955 BE
ASUS M4A78T-E (newest BIOS ver. 1604)
Arch Linux (same problem on other distros)
Please let me know, if I can help with any further information.
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