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List:       freedesktop-xorg
Subject:    Persistent triple-head setup
From:       martin f krafft <madduck () madduck ! net>
Date:       2014-06-23 12:21:51
Message-ID: 20140623122151.GA24819 () albatross ! lehel ! madduck ! net
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Hello,

I just got my triple-head setup across three GPUs working. Read
below for the steps, in case you are struggling as well.

Is there a way to write all this setup into xorg.conf, rather than
having to execute xrandr-commands from xinitrc or similar? The
reason is that I want the same setup for all users and so would
prefer centralised configuration.

Here's what I did:

  % xrandr --listproviders
  Providers: number : 3
  Provider 0: id: 0xdc cap: 0xf, Source Output, Sink Output, Source Offload, Sink \
Offload crtcs: 2 outputs: 3 associated providers: 0 name:radeon  Provider 1: id: 0x97 \
cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: \
3 associated providers: 0 name:radeon  Provider 2: id: 0x54 cap: 0xf, Source Output, \
Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0 \
name:radeon

  # enslave the second and the third to the first
  xrandr --setprovideroutputsource 1 0 --setprovideroutputsource 2 0

  # optional: add a new mode to the VGA-1-0 output
  # (since the Monitor setting in xorg.conf seems to be ignored)
  xrandr --newmode "1280x1024" 138.54 1280 1368 1504 1728 1024 1025 1028 1069 -HSync \
+Vsync  xrandr --addmode VGA-1-0 1280x1024

  # align the heads
  xrandr --output DVI-1 --auto --output DVI-2-2 --auto --right-of DVI-1 --output \
VGA-1-0 --mode 1280x1024 --right-of DVI-2-2

Somehow I would really like to rename those funky xrandr names. Then
again, once this is all hidden away in xorg.conf, it won't be much
of a bother.

Thanks,

-- 
martin | http://madduck.net/ | http://two.sentenc.es/
 
"i always choose my friends for their good looks and my enemies for
 their good intellects. man cannot be too careful in his choice of
 enemies."
                                                      -- oscar wilde
 
spamtraps: madduck.bogus@madduck.net


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