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

[Charles Butterfield]

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.

Regards
-- Charlie

[Adam Williamson]

On Wed, 2010-06-09 at 18:31 -0400, Charles Butterfield wrote:

>  Please advise if this should be posted somewhere else. 
Bugzilla! With Xorg.0.log and xrandr output and
possibly /var/log/messages . Against xorg-x11-drv-nouveau .
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org
http://www.happyassassin.net

[Charles Butterfield]

Will do!

Regards
-- Charlie

[Michal Hlavinka]

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

Michal