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Old 09-15-05, 11:05 PM   #1
Intangir
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Default Multiple X sessions on same card?

ok heres what im trying to do, i have a Geforce 6800 GT
it has 2 crt and 1 tv-out socket

i have a crt and a tv hooked upto it, i can use them both from one login but what i want to do is:

one x session will use 1 set of keyboard/mouse/crt and goto gdm to allow any user to log in the desktop

a 2nd x session i want it to use a 2nd set of keyboard/mouse/TV and login X as a 'mediacenter' user

i sorta works, both screens are seperate, each can have a different loged in user, and work completely with different mouse/keyboard/screen

problem is ONLY ONE WORKS AT A TIME!

i have to toggle back and forth with ctrl-alt-F7 and F8
when i switch between the two, the other turns off

i want BOTH running seperately at all times
both to have their screens showing, both to work independantly

basically instead of having a 'thin client' i want the 2nd mouse/keyboard/screen to be like its own thin client


what i have now is basically two xorg.conf files (xorgmedia.conf)
and they are basically the same except for mouse1 and mouse0, and monitor settings are different (for TV) and for the nvidia device in the media.conf i have option "connectedmonitor" "TV"



this is probably an X config issue, like im probably missing some little flag, im still looking thru the man/docs but i figured with basically all new video cards having multiple monitor capability someone here has probably done this
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Old 09-16-05, 07:06 AM   #2
JaXXoN
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Default Re: Multiple X sessions on same card?

Are you yet using a the multi-terminal patches for the kernel
and the X-Server? Without these patches, it is not possible
to have two X-Server displaying at the same time.
(http://www.c3sl.ufpr.br/multiterminal/howto-en.php)

Anyway, AFAIK, it is not possible to operate the two RAMDACs
on an nvidia card with seperate X-Servers. You can either configure
the card in twinview mode or the X-server using two screens (:0.0 and :0.1).

I guess from the hardware side, it should be possible to operate
two X-servers at the same time (using the multi-terminal patches),
but the nvidia driver doesn't allow that.

Following the discussions in this forum, the option for a multi terminal
setup using the two outputs on a single card has been requested
several times ...

regards

Bernhard
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Old 09-16-05, 01:49 PM   #3
superm1
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Default Re: Multiple X sessions on same card?

Will these multi terminal patches allow for you to use the nvidia drivers with two different nvidia cards and two seperate x servers in that case?
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Old 09-16-05, 03:42 PM   #4
JaXXoN
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Default Re: Multiple X sessions on same card?

Quote:
Originally Posted by superm1
Will these multi terminal patches allow for you to use the nvidia drivers with two different nvidia cards and two seperate x servers in that case?
According to Appendix A of the XFree Local Multi-User HOWTO, some people
managed to get four PCI nvidia cards working in parallel:

http://www.faqs.org/docs/Linux-HOWTO...l#app_vid_comp

regards

Bernhard
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Old 09-19-05, 03:45 PM   #5
Intangir
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Default Re: Multiple X sessions on same card?

jaxxon that first patch you linked is for debian only, and no source ;(
i found a similar patch though with source

basically the problem is with vtswitching, i posted to the xorg bugzilla requesting they add support in their newer versions for a flag like that (-sharevt or -novtswitching) they both do the same thing basically

hopefully it will be added in the future

also i think it IS possible to have two instances of X running at the same time both using their own hookup on a single ****** card but i am not totally sure yet, i have gotten two instances running that both use their own hook up on the same card but i am having that vt switching issue on X (i dont have the patch working!) so only one is visible at a time, but both are running, and i can switch back and forth between them so .. im hoping that means if i patch the vt switching issue that they can both run simultaniously (and visibly

wth why is it censoring out n-vidia?
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Old 09-19-05, 05:01 PM   #6
Intangir
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Default Re: Multiple X sessions on same card?

apparently the next release of xorg has built in "multiseat" support
basically the wrangled up those patches for -novtswitches and -sharevts and put them in, should be in the 6.9/7 release which is available on CVS now i think?
im going to try it tonight
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Old 04-09-06, 04:46 AM   #7
seffendi
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Question Re: Multiple X sessions on same card?

hi all,

any followup regarding this topic?
is it possible to use multiple X with one dual-head card?
mind to share an example working configuration ?

thanks.
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Old 04-16-06, 02:10 AM   #8
Intangir
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Default Re: Multiple X sessions on same card?

wow its been like a year and im still having the same issue

i have xorg7 it just isnt working when i try to do it, i think maybe its the card cant do it .. ;(
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