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[vizstack-users] Configuring Physical Desktops( was RE: Yet another odd problem . . .)
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From: Kumar, S. <shr...@hp...> - 2010-05-17 05:23:45
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Hi Simon, This is turning out to be more complicated that I had thought. The interaction with the console seems dependent even on the linux distro in use :-( In particular, I have observed that the default console gets all the keyboard data - whether it comes from PS/2 or from USB keyboards. On Ubuntu (that's your OS, correct?) you can try the following : - Disable all the gettys. This does away with the console entirely - so nobody will be around to snoop on the keyboard data. - Try your existing desktop (which doesn't use all GPUs). This should hopefully work. Regards -- Shree -----Original Message----- From: Sim...@cs... [mailto:Sim...@cs...] Sent: Saturday, May 15, 2010 1:10 PM To: viz...@li... Subject: Re: [vizstack-users] Yet another odd problem . . . Good to know there's a simple fix - I'll check out the doco and see if I can figure it out from there, otherwise I may come back for assistance. Simon ________________________________________ From: Kumar, Shree [shr...@hp...] Sent: Friday, May 14, 2010 7:52 PM To: viz...@li... Subject: Re: [vizstack-users] Yet another odd problem . . . Hi Simon, If you run a desktop which uses up _all_ the GPUs on the system, then you will not face such issues. What you are noticing is a contention for input devices between the X server and your console. When you run a desktop which does not use all GPUs on a system, you need a dedicated keyboard and a mouse for the session to avoid such conflicts. Let me explain: - your console is running all the time on a VT(virtual terminal). The console has access to the keyboard and mouse. - Using viz-desktop, when you start desktop on all the GPUs, the VT gets switched. This is similar to what happens when you run GDM, or if press CTRL-ALT-F7. The VT running the X server now has control of the keyboard and the mouse. - When you start a desktop on one or more (but not all) GPUs, the VT does not get switched. Not switching the VT is a requirement to run multiple X servers, which in turn is needed to share the node with multiple X servers. Since the VT does not switch, your console still has access to the keyboard and the mouse. That accounts for all the weirdness you see. In your case, the X server pops up on the same screen where your console is, causing even more confusion. To get one or more physical desktops working the way you want, you will need a separate physical keyboard/mouse per user. I have had best results with USB Keyboards and USB Mice. These need to be added into node_config.xml. Let me know if I need to describe the nitty gritty involved in this ! Regards -- Shree -----Original Message----- From: Sim...@cs... [mailto:Sim...@cs...] Sent: Friday, May 14, 2010 12:46 PM To: viz...@li... Subject: [vizstack-users] Yet another odd problem . . . A very odd problem . . . I've been running viz-desktop from an ssh session all the time, because when I run it from a console session, the first time I try to enter anything via the keyboard the display locks up - the mouse is still rendered normally, but nothing responds to it. I just found, while doing a bit of testing, that when I'm logged in at the console and I run a viz-desktop session via ssh the things that were typed into the session show up on the console as if they were typed in. So, I fire up viz-desktop, bring up a terminal, start up a vnc session, type in my password, and so on, and all those lines show up on the console. I just did a test where the only thing I brought up was firefox - I typed in a URL, hit enter, and the URL was in the bash history of the console. Just for fun I brought up a terminal and changed the prompt - when I closed the session the prompt in the console was also changed. Presumably this is some kind of issue with stdin/stdout not being redirected correctly . . . Simon Fowler Technical Specialist eResearch Visualisation team CSIRO IM&T Yarralumla, 2600 Desk 02 6124 1453 Mob 0409 245 871 ------------------------------------------------------------------------------ _______________________________________________ vizstack-users mailing list viz...@li... https://lists.sourceforge.net/lists/listinfo/vizstack-users ------------------------------------------------------------------------------ _______________________________________________ vizstack-users mailing list viz...@li... https://lists.sourceforge.net/lists/listinfo/vizstack-users ------------------------------------------------------------------------------ _______________________________________________ vizstack-users mailing list viz...@li... https://lists.sourceforge.net/lists/listinfo/vizstack-users |
