Same problem here with linux-image-2.6.20-9-386.
Disabled the new Prism54 driver and reenabled the old one, then recompiled the 
kernel. Works like a charm.

Linux saturn 2.6.20-9-386 #2 Mon Feb 26 02:58:41 UTC 2007 i686 GNU/Linux

/var/log/messages excerpt:
Mar  1 20:59:35 saturn kernel: [   56.584354] ACPI: PCI Interrupt Link [LNKC] 
enabled at IRQ 10
Mar  1 20:59:35 saturn kernel: [   56.584367] ACPI: PCI Interrupt 
0000:00:0a.0[A] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10
Mar  1 20:59:35 saturn kernel: [   58.179818] p54: LM86 firmware
Mar  1 20:59:35 saturn kernel: [   60.183095] ACPI: PCI interrupt for device 
0000:00:0a.0 disabled
Mar  1 20:59:35 saturn kernel: [   60.183105] prism54pci: probe of 0000:00:0a.0 
failed with error -22

lspci -vvnn:
00:0a.0 Network controller [0280]: Intersil Corporation ISL3890 [Prism GT/Prism 
Duette]/ISL3886 [Prism Javelin/Prism Xbow] [1260:3890] (rev 01)
        Subsystem: Tekram Technology Co.,Ltd. ALLNET ALL0271 Wireless PCI 
Adapter [16a5:1605]
        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, 7000ns max), Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at de004000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: [dc] Power Management version 1
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-

Working kernel config:
[EMAIL PROTECTED]:/boot$ diff config-2.6.20-9-386 config-2.6.20-ubuntu1 
3,4c3,4
< # Linux kernel version: 2.6.20-9-386
< # Sun Feb 25 21:40:35 2007
---
> # Linux kernel version: 2.6.20-ubuntu1
> # Thu Mar  1 23:19:22 2007
1783c1783
< # CONFIG_PRISM54 is not set
---
> CONFIG_PRISM54=m
3551,3553c3551
< CONFIG_D80211_P54_COMMON=m
< CONFIG_D80211_P54_USB=m
< CONFIG_D80211_P54_PCI=m
---
> # CONFIG_D80211_P54_COMMON is not set

-- 
Please reenable CONFIG_PRISM54 again
https://launchpad.net/bugs/85315

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