Re: [Hampshire] PCI bus IDs? in xorg.conf

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Author: Hugo Mills
Date:  
To: Hampshire LUG Discussion List
Subject: Re: [Hampshire] PCI bus IDs? in xorg.conf

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On Tue, Oct 16, 2007 at 09:18:13PM +0100, alan c wrote:
> However, it was also essential it seemed, (in xorg.conf) to get the correct
> numbers for the BusID I started with "PCI:0:1:0" which seemed to be a
> default value. It did not work. I noticed that knoppix used BusID
> "PCI:1:0:0" in its xorg.conf. But this did not work for ubuntu. The value
> which did work was BusID "PCI:1:7:0".
>
> It works (!) and I am not complaining, but I realise I have no idea what or
> why one PCI bus value is good or not. Can anyone explain simply or briefly
> please? Could I have deduced the numbers by visual inspection of the card
> position of what?


No, you couldn't, sadly. The way to work this out is to use lspci.
There's an article on the wiki[1] about interpreting the output of
lspci. In brief, the PCI BusID is about the logical connection of the
card to the rest of the system.

Hugo.

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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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