GeForce 7900 dual monitor: DVI1=Display 0.1 and DVI2=Display 0.0 (swapped)

Bug #184684 reported by Witold Szczerba on 2008-01-20
Affects Status Importance Assigned to Milestone
xorg (Ubuntu)

Bug Description

Hi there,
my video card is GeForce 7900 GS dual DVI-I output. I had no problems with Ubuntu 7.10 until yesterday when I bought LCD TV and connected it to my computer using D-SUB cable:
[PC DVI-I 1: DVI] ------------------------cable--------[Monitor: DVI IN]
[PC DVI-I 2: D-SUB adapter]--------cable---------[TV: D-SUB PC INPUT]
I am using 7.10 with most recent updates and restricted video drivers.

The problem is that Ubuntu is detecting LCD TV as a primary screen (DISPLAY=0.0) and my primary monitor as secondary screen (DISPLAY=0.1) which means when I watch TV or when TV is turned off I cannot do anything, login window is displayed on TV only.
I was trying different configurations including Xinerama (I dont like that approach) and every other combination, but the bottom line is: TV is always the first, most important display.
I was trying to convince Ubuntu to treat my monitor as it was before, I mean as primary screen, but as long as TV is connected, my monitor is always a second-class buddy :(

The only work-around for this is to unplug TV when using Ubuntu (on Windows everything works like a charm, but I use it only when I really have to... but right now I prefer to boot to Windows rather than diving under the table and disconnecting cables).

I am not sure, maybe it is some bug in Nvidia's GeForce driver, or this is only Ubuntu issue... if someone could tell anything about that disaster I am facing now I would be really glad. Please note, this is serious issue, makes my Linux OS unusable right now).
In few days I should have DVI-HDMI cable and will try this. Hope shall not be abandoned.

Bryce Harrington (bryce) wrote :

Hi witold-szczerba,

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Can you try with the latest development release of Ubuntu? (ISOs are available from

If it remains an issue, could you also attach a new /var/log/Xorg.0.log?
Thanks in advance.

The output of lspci -vvnn would also be worth having.

Changed in xorg:
status: New → Incomplete

Hmm, it was long time ago, I do not remember how did I manage that thing to work.
Now I am using Ubuntu 8.04 and everything is OK. I was setting it up half year ago and really, I do not know/remember if this is still an issue. In few days I am going to flush my root partition and do a fresh install of brand new 8.10.
Please stay tuned.

Witold Szczerba

Timo Aaltonen (tjaalton) wrote :

nvidia driver bug, either it works now or doesn't.. we can't fix it if it doesn't.

Changed in xorg:
status: Incomplete → Invalid
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