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SubjectRe: Can't allocate resources for PCI video card behind bridge
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Cc-ing linux-pci and Jesse.

On Thursday 08 January 2009, Connor Behan wrote:
> 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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