F13: nouveau driver seems to swap video streams on NVIDIA NVS-290.

Michal Hlavinka mhlavink at redhat.com
Thu Jun 10 08:19:56 UTC 2010

On Thursday, June 10, 2010 00:31:20 Charles Butterfield wrote:
> I suspect the nouveau driver is swapping or mislabeling the two video
> streams that the NVS-290 card generates.  Here are my clues:
> Setup
> - Fedora-13 and nouveau driver (latest yum updates as of midnight)
> - NVIDIA NVS-290 video card
> - nouveau exposes 2 outputs to XRandR (DVI-I-1 and DVI-I-2)
> - The NVS-290 video card has a DMS-59 connector, with a
>   short DMS-59 to Dual VGA cable with VGA connectors
>   labeled 1 and 2.
> - VGA connectors #1 and #2 are connected to monitors #1(Left)
>   and #2(Right).
> Behavior
> 1) At boot time, before the nouveau driver is involved, the boot text is
>    output on the VGA connector labeled "1", which is connected to
> monitor
>    #1 (on my left).
> 2) At GDM login time, monitor #1 is clearly assigned to the right of the
>    Virtual screen (its right edge is "impenetrable") while monitor #2 is
>    on the left side.  Weird, but in theory just an odd default.  But
> wait.
> 3) Inspecting the "xrandr" output, it is clear that pixels on the
> virtual
>    screen that are directed to "DVI-I-1" are going to monitor #2 and
>    vice versa (DVI-I-2 goes to monitor #1).  I checked the default
>    situation, then flipped the two halves of the virtual screen back
>    and forth with xrandr, checking the xrandr status each time.
> 4) The last bit of weirdness is that the xrandr geometry setting
> commands
>    seemed reversed from what would be expected.  Maybe that is the
>    inevitable result of mislabeling the data stream, or perhaps it is an
>    important clue in its own right.  My head hurts at the point.
> Misc
> 5) Oh yes, I buzzed out the cable, just in case it was mis-wired or
>    mis-labled.  It's fine, that is DMS59:VGA2_RED -> VGA#2:RED, etc.
> Please advise if this should be posted somewhere else.

I guess you've hit the same bug as me, I even have the same video card.

Bug was reported here: https://bugzilla.redhat.com/show_bug.cgi?id=582582

but it was closed as notabug


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