[AG-TECH] Multiple X Screens and VNC Problem (Linux)

[Christoph Willing]

Jason,

I just had a quick look at this on machines with the same hardware as  
you and running vino as the rdesktop server. Using tightvnc as the  
viewer, I see the same problem - only the primary output (2 screens  
Twinviewed) is seen at the viewer.

However if I run vinagre as the viewer I can see all 4 screens. The  
only problem is that the cursor disappears and I therefore have no  
control of the remote desktop - so some advance but ...

This test was with Slackware 12.2 & gnome 2.24. Since vino & vinagre  
are part of gnome, it may be that different versions of it will behave  
differently (better?) as the versions increase.


chris


On 03/02/2009, at 10:23 AM, Jason Bell wrote:

> G’day All
>
> As an update, I have also tried x11vnc using a variety of settings (- 
> xinerama -noxwarppointer -noshm -noxdamage –noxfixes to name a few)  
> without any luck.
>
> I have tried recompiling, re-installing and re-starting vino, as  
> suggest http://bugzilla.gnome.org/show_bug.cgi?id=346258
>
> I have also tried and number of xorg.conf settings.
>
> The interesting kicker is that similar problems occur when using  
> synergy…  IE, can only control one of the screens.
>
> I am now tending to think that the issue is more of an nvidia driver  
> issue or an xorg issue.
>
> I initially submitted a bug report to the gnome forums, see http://bugzilla.gnome.org/show_bug.cgi?id=570178 
> , but with suspecting the nvidia driver, I have submitted a nvidia  
> forum post, see http://www.nvnews.net/vbulletin/showthread.php?t=127386
>
> Thanks for everyone’s comments so far and I will keep you all posted.
>
> Regards,
>
> Jason.
>
>
>
> _____________________________________________
> From: Jason Bell
> Sent: Saturday, 31 January 2009 11:09 AM
> To: ag-tech at mcs.anl.gov
> Subject: Multiple X Screens and VNC Problem (Linux)
>
>
> G’day All
>
> I was hoping that someone might be able to help me out with a problem.
>
> I have a Access Grid machine (details to follow) that has 2 x dual  
> head video cards.  I recently upgraded the machine to fedora 10 (No  
> distro flame wars please) in which I can no longer remote desktop  
> (using vnc) properly to be able to see and control all X Screens (4  
> in total).
>
> In previous versions of Linux, I use to use "Desktop Sharing" in  
> KDE, but Krfb recently due to some software updates, has been found  
> to be problematic.
>
> I am currently trying to use "Remote Desktop (Gnome)" in which  
> appears to work fine, but only allows me to control the primary  
> display screen.  I have also tried x0vncserver with similar results.
>
> I am using 2 nVidia Quadro FX1700 video cards, using nvidia-setting  
> to configure the 4 displays using xinerama.  Note: if I use Separate  
> Screens, I can only control the first screen, if I use Twinview, I  
> am able to control the first 2 screens, but not the other 2.
>
> Also note that I need to be able to connect to this "desktop" via a  
> windows machine, using something like realvnc or ultravnc (I have  
> tried both).
>
> Therefore, I was wondering if anyone knew a solution to this problem  
> as google doesn't seem to be helping me this time round.  Though it  
> does appear to be less an "distro" problem, as I have seen people  
> (on the web) complaining about similar problems with other flavours  
> of Linux.
>
> Someone mentioned that there might be a -ignorexinerama option  
> within the server or vncviewer, but I haven't been able to find  
> anything.
>
> Details on the system are as follows:
>
> Dell Precision T3400
>
> 2.4GHz quad-core Core 2 (Q6600)
>
> Dual 512MB PCIe x16 nVidia Quadro FX1700 video cards
>
> 2GB of Memory
>
> 320GB SATA HDD (3.0Gb/s, 7.2k RPM)
>
> Gigabit NIC
>
> 16X max DVD+/-RW Drive
>
> Running Fedora 10 (x86_64 Version)
>
>
> Your assistance in helping me to solve this problem would be  
> extremely appreciated.
>
> Regards,
>
> Jason.
>
> --------------------------------------------
>
> Jason Bell, B.I.T. (Honours)
>
> Research Systems Support Officer
>
> Information Technology Division
>
> CQ University Australia
>
> Australian Research Collaboration Service
>
> http://www.arcs.org.au/
>
> E-mail : j.bell at cqu.edu.au
>
>          jason.bell at arcs.org.au
>
> Work   : +61 7 4930 9229
>
> Mobile : 0409 630897
>
> Postal : Building 19
>
>          Central Queensland University
>
>          Bruce Highway
>
>          Rockhampton, Queensland, Australia, 4702
>
> --------------------------------------------
>
> Patience is a virtue.
>
> But if I wanted Patience,
>
> I would have become a Doctor.
>
> --------------------------------------------
>
>

Christoph Willing                       +61 7 3365 8316
QCIF Access Grid Manager
University of Queensland