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SubjectIRQ routing and USB audio on Dell Inspiron 4100
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Date
Hello,

I've been having difficulty getting smooth USB audio output on my Dell
Inspiron 4100 with a Griffin iMic. It works great when the machine is
unloaded (on 2.4.18 I got constant breakups; I think the improvement
is related to the recent USB fixes), but any video or disk activity
causes breakups.

I have a feeling that I need to get the USB controller onto its own
IRQ, and a further, horrible, feeling that the chipset in this machine
is "integrated" to such an extent that this is not possible. My
fiddlings with setpci had no discernible effect, although I could
simply have been doing it wrong.

I'm running Linux 2.4.19-pre7 (with international Crypto and rmap13).
The BIOS version is A03, which does not appear to have any kind of
options for fiddling with IRQs at all. I plan to try with A07
tomorrow.

Further information follows.

$ uname -a
Linux darkstar 2.4.19-pre7-rmap13-1 #1 Sun Apr 21 18:12:13 IST 2002 i686 unknown
$ /sbin/lsmod
Module Size Used by Tainted: P
audio 37824 0
uhci 23784 0 (unused)
soundcore 3268 3 (autoclean) [audio]
orinoco_cs 4712 2
orinoco 29696 0 [orinoco_cs]
hermes 3296 0 [orinoco_cs orinoco]
ds 6624 3 [orinoco_cs]
i82365 22448 3
pcmcia_core 38176 0 [orinoco_cs ds i82365]
ipt_state 608 1 (autoclean)
ip_conntrack 12940 1 (autoclean) [ipt_state]
ipt_REJECT 2784 3 (autoclean)
ipt_LOG 3104 3 (autoclean)
iptable_filter 1728 1 (autoclean)
ip_tables 10368 4 [ipt_state ipt_REJECT ipt_LOG iptable_filter]
ext3 56064 7 (autoclean)
jbd 34536 7 (autoclean) [ext3]
usbcore 54080 1 [audio uhci]
cipher-blowfish 8736 1
cryptoloop 1916 1
cryptoapi 3044 2 [cipher-blowfish cryptoloop]
loop 7824 3 [cryptoloop]
radeon 92408 0 (unused)
agpgart 15456 1
apm 9024 2
rtc 5528 0 (autoclean)
$ cat /proc/interrupts
CPU0
0: 251481 XT-PIC timer
1: 7443 XT-PIC keyboard
2: 0 XT-PIC cascade
8: 3 XT-PIC rtc
11: 18796 XT-PIC i82365, orinoco_cs, usb-uhci
12: 36747 XT-PIC PS/2 Mouse
14: 25275 XT-PIC ide0
15: 0 XT-PIC ide1
NMI: 0
ERR: 0
$ sudo lspci -vvvv
00:00.0 Host bridge: Intel Corp.: Unknown device 3575 (rev 02)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Region 0: Memory at d0000000 (32-bit, prefetchable) [size=256M]
Capabilities: [40] #09 [0105]
Capabilities: [a0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW+ Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=x1

00:01.0 PCI bridge: Intel Corp.: Unknown device 3576 (rev 02) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000c000-0000cfff
Memory behind bridge: fc000000-fdffffff
Prefetchable memory behind bridge: e0000000-e7ffffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-

00:1d.0 USB Controller: Intel Corp.: Unknown device 2482 (rev 01) (prog-if 00 [UHCI])
Subsystem: Intel Corp.: Unknown device 4541
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 11
Region 4: I/O ports at bf80 [size=32]

00:1e.0 PCI bridge: Intel Corp. 82820 820 (Camino 2) Chipset PCI (-M) (rev 41) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=02, subordinate=10, sec-latency=32
I/O behind bridge: 0000e000-0000ffff
Memory behind bridge: f4000000-fbffffff
Prefetchable memory behind bridge: fff00000-000fffff
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-

00:1f.0 ISA bridge: Intel Corp.: Unknown device 248c (rev 01)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

00:1f.1 IDE interface: Intel Corp.: Unknown device 248a (rev 01) (prog-if 8a [Master SecP PriP])
Subsystem: Intel Corp.: Unknown device 4541
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 01f0 [size=8]
Region 1: I/O ports at 03f4
Region 2: I/O ports at 0170 [size=8]
Region 3: I/O ports at 0374
Region 4: I/O ports at bfa0 [size=16]
Region 5: Memory at 10000000 (32-bit, non-prefetchable) [size=1K]

00:1f.5 Multimedia audio controller: Intel Corp. AC'97 Audio Controller (rev 01)
Subsystem: Cirrus Logic: Unknown device 5959
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin B routed to IRQ 11
Region 0: I/O ports at d800 [size=256]
Region 1: I/O ports at dc80 [size=64]

00:1f.6 Modem: Intel Corp.: Unknown device 2486 (rev 01) (prog-if 00 [Generic])
Subsystem: PCTel Inc: Unknown device 4c21
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin B routed to IRQ 11
Region 0: I/O ports at d400 [size=256]
Region 1: I/O ports at dc00 [size=128]

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY (prog-if 00 [VGA])
Subsystem: Dell Computer Corporation: Unknown device 00e4
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop+ ParErr- Stepping+ SERR+ FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2000ns min), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
Region 1: I/O ports at c000 [size=256]
Region 2: Memory at fcff0000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: [58] AGP version 2.0
Status: RQ=47 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA+ AGP- 64bit- FW- Rate=<none>
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:00.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink] (rev 78)
Subsystem: Dell Computer Corporation: Unknown device 00e3
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2500ns min, 2500ns max), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at ec80 [size=128]
Region 1: Memory at f8fffc00 (32-bit, non-prefetchable) [size=128]
Expansion ROM at f9000000 [disabled] [size=128K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable+ DSel=0 DScale=2 PME-

02:01.0 CardBus bridge: Texas Instruments PCI1420
Subsystem: Dell Computer Corporation: Unknown device 00e4
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at f4000000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=02, secondary=03, subordinate=06, sec-latency=32
Memory window 0: 00000000-00000000 (prefetchable)
Memory window 1: 00000000-00000000 (prefetchable)
I/O window 0: 00000000-00000003
I/O window 1: 00000000-00000003
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001

02:01.1 CardBus bridge: Texas Instruments PCI1420
Subsystem: Dell Computer Corporation: Unknown device 00e4
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at f4001000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=02, secondary=07, subordinate=0a, sec-latency=32
Memory window 0: 00000000-00000000 (prefetchable)
Memory window 1: 00000000-00000000 (prefetchable)
I/O window 0: 00000000-00000003
I/O window 1: 00000000-00000003
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001

02:03.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus Controller (rev 01)
Subsystem: Lucent Technologies: Unknown device ab01
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at f4002000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=02, secondary=0b, subordinate=0e, sec-latency=176
Memory window 0: 00000000-00000000 (prefetchable)
Memory window 1: 00000000-00000000 (prefetchable)
I/O window 0: 00000000-00000003
I/O window 1: 00000000-00000003
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt- PostWrite+
16-bit legacy interface ports at 0001

Regards,

Sean

--
///////////////// | | The spark of a pin
<sneakums@zork.net> | (require 'gnu) | dropping, falling feather-like.
\\\\\\\\\\\\\\\\\ | | There is too much noise.
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