No X unless xorg.conf includes BusID

[Adam]

Fresh install of Kubuntu 8.10 on an Compaq Presario 5000 with an ATI Radeon 9800 Pro that I added. Now I have both integrated graphics and an AGP video card, and no way to disable either option in the BIOS.

Using the S-Video port of the Radeon connected to a Sanyo DS27425 television, I get a blank screen instead of KDM. In order to get a working KDM, I had to execute the command:

sudo dpkg-reconfigure -phigh xserver-xorg

This created a skeleton /etc/X11/xorg.conf, since the default file was completely blank.

I then looked at the output of sudo lspci for my ATI card and found two lines that began with these numbers:

01:00.0
01:00.1

I then used the first one (it was a guess) in the form of "PCI:1:0:0" and placed it in the Device section of xorg.conf as:

BusID "PCI:1:0:0"

(Note that using the second number as "PCI:1:0:1" did not work.)

Additionally, I referenced https://wiki.ubuntu.com/X/Config/SVideo and also added to the Device section for S-Video support:

Option "TVDACLoadDetect" "TRUE"

This gave me a working KDM; however, KDE won't login without freezing unless I add:

Section "Extensions"
        Option "RANDR" "Disable"
EndSection

As far as I can tell, everything now works.

[Chris Coulson (chrisccoulson)]

Thank you for your bug report. Please attach your /var/log/Xorg.0.log without specifying the BusID in your xorg.conf. Please also attach the output of "sudo lspci -vvnn > lspci.log".

Thanks

[Adam (adam.russell)]

This is the smallest /etc/X11/xorg.conf needed to get a working X on my system.