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Subjectthinkpad R-30 Ali M5451 lockdown
Occasionally the ALI M5451 driver (trident.c) would lock down my IBM
thinkpad R30. The console would continously flash the message:

ali: AC97 CODEC read timed out.

And the machine wouldn't respond to the keyboard or ssh. I'm trying to
reproduce and debug it now. Has anyone else run accross it? google has
been less than helpful.

relevant lspci -vv output:

00:06.0 Multimedia audio controller: Acer Laboratories Inc. [ALi] M5451 PCI AC-Link Controller Audio Device (rev 01)
Subsystem: IBM: Unknown device 0506
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 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 9400 [size=256]
Region 1: Memory at 81c00000 (32-bit, non-prefetchable) [size=4K]
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=0 PME-
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