Can't start nVidia SLI in Intrepid

Bug #267525 reported by Dean Loros on 2008-09-07
Affects Status Importance Assigned to Milestone
nvidia-graphics-drivers-177 (Ubuntu)
xorg (Ubuntu)

Bug Description

X.Org X Server (1.5.0 RC 6)

Current testing Ubuntu Intrepid with all updates done. I can start a Xserver
with one nVidia card installed, but as soon as I try to run two cards with
"Option SLI AUTO" or any other option the xserver fails & I drop to terminal.
I have also contacted nVidia about this & have several nVidia bugreports.

I have tried the "bulletproof X" conf and several different custom xorg.conf
files, all without a SLI start.

I can go back to my 8.04 (Hardy) install & just add the Option to my normal
xorg.conf & have a normal X start.

Included are my nVidia bugreports--please contact me if you need anything else.

Other information:

Dean Loros (autocrosser) wrote :
Alberto Milone (albertomilone) wrote :

can you try with the attached xorg.conf?

Changed in xorg:
status: New → Invalid

What was the problem area? Backingstore or AddARGBGLXVisuals? Or?

SLI is up--do you think that SFR would be better than AFR?


Alberto Milone wrote:
> can you try with the attached xorg.conf?
> ** Attachment added: "xorg.conf"
> ** Also affects: nvidia-graphics-drivers-177 (Ubuntu)
> Importance: Undecided
> Status: New
> ** Changed in: xorg (Ubuntu)
> Status: New => Invalid

Dean Loros (autocrosser) wrote :

Consider bugreport closed--I have posted the xorg.conf to nVidia forums & ubuntuforums.

Alberto Milone (albertomilone) wrote :

I wouldn't know which of the two sli modes would be better (since I have never tried SLI).

I think that adding the BusID to the Device section made it clear to the xserver which card had to be considered as the first device.

Changed in nvidia-graphics-drivers-177:
status: New → Invalid
Dean Loros (autocrosser) wrote :

Just a note--testing with both modes--SFR is MUCH better that AFR--test case: Flury screensaver--with AFR there is a very note-able change between the two GPUs--in SFR, you see a horizontal line generate & dissolve for the first couple of seconds--then it has "seemed" to balance the load between the two GPUs. I must admit that everything seems more "fluid" using two GPUs--can't believe that there was such a difference.

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