I have two video cards:
PCI Rage128
AGP Radeon

X is loaded on the Rage128 on VT7
X is not configured to support the radeon

I switch to VT1 and load radeonfb
This works fine.

Now I switch to VT7 and dump PCI config space for the radeon

[root@jonsmirl 0000:01:00.0]# hexdump config >/foo
[root@jonsmirl 0000:01:00.0]# diff /foo /bar
1c1
< 0000000 1002 4966 0080 02b0 0001 0300 4010 0080
---
> 0000000 1002 4966 0083 02b0 0001 0300 4010 0080
4c4
< 0000030 0000 fea0 0058 0000 0000 0000 010b 0008
---
> 0000030 0000 fe90 0058 0000 0000 0000 010b 0008
[root@jonsmirl 0000:01:00.0]#

Somebody is changing PCI command from 83 to 80 and disabling my
radeon's memory and iospace. Who is doing this? It has to be X since
it doesn't happen if I switch to VT6 or VT8.

Why is X mucking with a card it doesn't have a driver loaded for?
Where is this happening in the X code?

Jon Smirl írta:
> Somebody is changing PCI command from 83 to 80 and disabling my
> radeon's memory and iospace. Who is doing this? It has to be X since
> it doesn't happen if I switch to VT6 or VT8.
>
> Why is X mucking with a card it doesn't have a driver loaded for?
> Where is this happening in the X code?
>

Hm. Someone other than a Linux-ruby user finally complaining. :-)
Try patching XFree or XOrg with the proper patch

http://www.ltn.lv/~aivils/files/080_pci_isolate_device_feature.diff

for XFree, or

http://www.ltn.lv/~aivils/files/Xorg-6.7.0-isolate_device.patch

for XOrg, it's applicable for XOrg-6.8.x, too.

Then add
         Option         "SingleCard" "on"
to your Section "ServerLayout".

Best regards,
Zoltán Böszörményi