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SubjectCan't allocate resources for PCI video card behind bridge
Hello, I am trying to use two video cards. One is the built in ATI Rage 
Mobility M3 AGP card which drives the screen of my laptop (Thinkpad a22m
2628-S1U if that matters), the other is the ATI Radeon X1550 PCI card in
the Thinkpad Dock II which is supposed to drive an external monitor.
X1550 is a PCI-E chipset but my card is a PCI card with an onboard PCI
to PCI-E bridge. I first tried this with kernel 2.6.27 as packaged by
Archlinux and got the following startup errors:

pci 0000:00:04.0: BAR 7: can't allocate resource
pci 0000:00:04.0: BAR 8: can't allocate resource
pci 0000:00:04.0: BAR 9: can't allocate resource

I've seen this problem discussed in the archives and couldn't find what
looked like a fix. I WAS able to fix this by loading dock, pci_slot,
pci_hotplug and acpiphp and appending pci=assign-busses. However since
then I have run a package update to kernel 2.6.27.10 and I am once again
getting the same problem even with the same modules and parameters. I
have since tried appending irqpoll, pci=bios, pci=routeirq and acpi=off
with no success. I have even rolled back my kernel to 2.6.27 (and the
headers and a few other packages) setup my system the way it was setup
before to the best of my knowledge but I still can't get the PCI card
working again. Another subtle change must be responsible.

Certain PCI devices in the dock are working such as the Cardbus slots...
but I could care less about them... is there a way I could tell the
kernel to prioritize the video card and sacrifice Cardbus slots first if
it can't allocate enough resources? Also my lspci output shows a large
gap 01:00.0 to 06:00.0 so some part of my system must have expected
other devices in that range. When I had the video card working it was
02:00.0. I have tried changing the four IRQ numbers in the BIOS but this
is pointless at best and sometimes causes my soundcard to be disabled.
My dmesg, lspci and (trimmed) kernel config are pasted:

dmesg: http://pastebin.com/f3ae15a58
lspci: http://pastebin.com/f5d7dee6e
.config: http://pastebin.com/fb925760

I'm hoping for a solution that doesn't require recompiling the kernel
but I definitely would if that's necessary. In any event I'll be much
more vigilant about system updates if I get this working again.
Thank-you very much for your time.


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