[SOLVED] triple display config. twinview, xinerama, xrandr

musasabi · Last edited by musasabi on Fri Mar 25, 2011 7:59 pm; edited 1 time in total

so, i am tangling with triple display stuff. when i first started (a month ago or so), i found this article:

http://superuser.com/questions/55845/triple-3-monitors-under-linux

are we still this broken? from what i can tell, we are. i tried using the nvidia config tool, and got all three working as either "one" xinerama or one twinview and one separate x screen. also, three separate x screens works fine.

my question is: what am i supposed to do to get one big desktop across three (identical) monitors that respects monitor boundaries in maximization? that's all i want. haha. i tried following this guide to set up xrandr:

http://www.thinkwiki.org/wiki/Xorg_RandR_1.2

but when i run xrandr -q, i get this:

Knute · Guru Joined: 28 Jun 2004 Posts: 362 Location: Fargo, ND

You have 2 cards, so, it would stand to reason that, you would need 2 Screen sections.

Also, you may need to define the Virtual option, but I'm not sure.

HTH
_________________
Knute
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The human race has one really effective weapon, and that is laughter.
-- Mark Twain

If you want proof of that, take a look at windows sometime.

musasabi · Posted: Thu Mar 24, 2011 7:02 pm Post subject:

the guide i posted above (which is the one X's website links to as the guide for setting up xrandr) says "omit dual Device/Screen/Monitor sections". i realize i've got multiple monitor and device sections already, but... yeah.

half the reason i made this post is because xrandr's documentation is... incomplete, at best, in so far as i can tell. so, i can slap in an extra screen section, but the real question is where is xrandr getting the name "default" from? how do i change that? and, again, is what i'm going after even possible?

i'll throw another screen section in, though, don't worry.

Knute · Guru Joined: 28 Jun 2004 Posts: 362 Location: Fargo, ND

What happens if you open nvidia-settings from a terminal as root?

Does all 3 monitors show up?

Can you configure them the way that you want? If so, then if you save to Xconfig, and then merge the changes, do they work when you go back into X?
_________________
Knute
----------
The human race has one really effective weapon, and that is laughter.
-- Mark Twain

If you want proof of that, take a look at windows sometime.

musasabi · Posted: Fri Mar 25, 2011 7:58 pm Post subject:

yeah, that's actually what i wound up doing. it would've worked from the start, but i forgot to compile metacity with the xinerama useflag. =)

for posterity, here's the working xorg.conf: