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Re: [LUG] Multiple users on 1 PC

 

yes, but i was meant to be working :P

On 10/12/06, Neil Stone <neil@xxxxxxxxxxxxxxx> wrote:
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> Michael Mortimore wrote:
> > there is a guide somewhere on the alphagrip google group about setting
> > the trackball speed differently to your mouse speed. it'll tell you
> > how to do the udev rules.
> >
> > http://groups.google.com/group/alphagrip?lnk=lr
> >
> > can't link the relevant thread since it's blocked at work :(
> >
> > On 10/12/06, Grant Sewell <dcglug@xxxxxxxxxxxx> wrote:
> >> Neil Stone wrote:
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> >>> Grant Sewell wrote:
> >>>> Rob Beard wrote:
> >>>>> HI folks,
> >>>>>
> >>>>> When I was playing around with Kubuntu at work on one of our new Dell
> >>>>> PCs (Pentium D 820) I got wondering something.  Would it be possible to
> >>>>> run two desktops at the same time on one PC?
> >>>>>
> >>>>> Now I know there have been products in the past that provide an extra
> >>>>> video output, keyboard, mouse and sound for Windows, but I wondered if
> >>>>> it could be done cheaply on Linux?
> >>>>>
> >>>>> What I was thinking of was...
> >>>>>
> >>>>> Standard PC (say a average sort of spec Pentium D or Athlon 64) with an
> >>>>> ample amount of memory (say 1GB).
> >>>>> An extra video card (say PCI 128MB Radeon card or similar).
> >>>>> An extra sound card (PCI cheapo sound card)
> >>>>> A USB keyboard and mouse and extra monitor.
> >>>>>
> >>>>> I wondered if it would be possible to run two copies of X and Gnome/KDE
> >>>>> etc on the one PC so one user is on the main monitor using the main
> >>>>> keyboard/mouse/sound card and a second user is on a second monitor with
> >>>>> a completely different desktop using the second video card, USB keyboard
> >>>>> and mouse and extra sound card?
> >>>>>
> >>>>> I'm thinking something a bit like LTSP but one one machine?
> >>>>>
> >>>>> Is it possible to have more than one USB keyboard and mouse on a PC and
> >>>>> then specify which one is used for input?
> >>>>>
> >>>>> If it is possible then I dare say it is another opportunity to put some
> >>>>> of these high powered desktop PCs to a more cost effective use.
> >>>>>
> >>>>> Rob
> >>>> I have regularly thought about this, but never actually got around to
> >>>> testing it out.
> >>>>
> >>>> You can certainly add the appropriate entries in your X config, you'd
> >>>> need 2 of everything mind... two mouse entries, two keyboard entries,
> >>>> two GFX card entries, two monitor entries, two "Screen" entries and two
> >>>> ServerLayout entries.
> >>>>
> >>>> You can definitely start a second X session easy enough... from the CLI.
> >>>>   I regularly do.  At a CLI, if you type "startx -- :1" (without the ""
> >>>> marks) then it'll load up another X session locally.  If you wanted to
> >>>> start it on the second set of devices, then you could use "startx --
> >>>> -layout OtherDevices :1" *should* work (if I've read the docs correctly).
> >>>>
> >>>> Making it do all this automagically on a "normal" distro is, however,
> >>>> going to be a touch more complex.  Presuming, of course, that you want a
> >>>> login manager such as GDM to start on both screens.
> >>>>
> >>>> Grant.
> >>>>
> >>> Yes thats about it in a nutshell.. I have used somthing like this
> >>> before... wasn't with USB which i can see as the only potential hurdle,
> >>> but still, doable.
> >>>
> >>> - --
> >>> Neil Stone
> >>>
> >>> Systems Administrator
> >>> FlashTek UK
> >> USB shoudln't be a hurdle.  So long as you know the order in which
> >> devices will be detected, you should be fine.  For example, if I want X
> >> to take input from my trackpad (laptop) then I can tell it to read from:
> >> /dev/psaux
> >> /dev/input/mice
> >> /dev/input/mouse1
> >>
> >> If X is set to /dev/input/mice, then any other pointing device (USB
> >> mouse) will also be read for the same input.  However, if I specifically
> >> specify a unique device (/dev/input/mouse1) then any other pointing
> >> device (/dev/input/mouse2, for example) will be ignore by the X session
> >> using /dev/input/mouse1.
> >>
> >> So, it is possible to specify which pointing device each X session uses.
> >>  The same is true for keyboards.  The hard bit in this respect would be
> >> discovering which physical device is attached to which /dev/ device, and
> >> being confident that they will always use those device names.
> >>
> >> If you wanted to get really into it, you could hack around with the uDev
> >> rules to make it that each known keyboard is assigned unique names (such
> >> as /dev/mainkeyboard and /dev/extrakeyboard) and then use those unique
> >> names in your X config... but that might not be necessary. ;)
> >>
> >> Grant.
> >>
> >> --
> >> The Mailing List for the Devon & Cornwall LUG
> >> http://mailman.dclug.org.uk/listinfo/list
> >> FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html
> >>
> >
>
> Or you could talk to your IT dept...
>
> - --
> Neil Stone
>
> Systems Administrator
> FlashTek UK
>
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> --
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