One (Intel) GPU multiseat without Xephyr/Xnest, with a Xorg server per output

[Troll Berserker]

Is it possible?
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[Adam Jackson]

Post by Troll Berserker
Is it possible?

No.

- ajax
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[Troll Berserker]

Post by Troll Berserker
Is it possible?

No.

Yes, with DRM Leases.
Although there is no production ready solution.
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[Chris Wilson]

Quoting Troll Berserker (2018-09-18 16:28:02)

Post by Troll Berserker
Is it possible?

man 4 intel, search for ZaphodHeads
-Chris
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[Dennis Clarke]

Post by Chris Wilson
Quoting Troll Berserker (2018-09-18 16:28:02)

Post by Troll Berserker
Is it possible?

man 4 intel, search for ZaphodHeads
-Chris
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https://www.x.org/archive/current/doc/man/man4/intel.4.xhtml

Option "ZaphodHeads" "string"

Specify the randr output(s) to use with zaphod mode for a particular
driver instance. If you this option you must use it with all
instances of the driver

For example:

Option "ZaphodHeads" "LVDS1,VGA1"


Will assign xrandr outputs LVDS1 and VGA0 to this
instance of the driver.

dc
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[Troll Berserker]

Post by Chris Wilson
Quoting Troll Berserker (2018-09-18 16:28:02)

Post by Troll Berserker
Is it possible?

man 4 intel, search for ZaphodHeads

modesetting driver also supports ZaphodHeads
Will it allow me to share one /dev/dri/card0? I very much doubt it.
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[Troll Berserker]

Post by Chris Wilson
Quoting Troll Berserker (2018-09-18 16:28:02)

Post by Troll Berserker
Is it possible?

man 4 intel, search for ZaphodHeads
-Chris

It didn't help much.
First of all, I've created an artificial seat-1 with logind (with the intel driver Xorg won't touch drm node, right?):
$ sudo loginctl attach seat-1 /sys/devices/pci0000\:00/0000\:00\:02.0/graphics/fb0

Then I've written the xorg.conf (attached)

Effect? Only one Xorg starts, at seat0, the Xorg at the seat-1 with intel driver can't get DRM master permission and unloads itself:

[ 1581.001] (EE) intel(0): [drm] failed to set drm interface version: Permission denied [13].
[ 1581.001] (II) intel(0): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
[ 1581.001] (II) intel(0): [drm] command pid dev master a uid magic
[ 1581.001] (II) intel(0): [drm] Xorg 2404 0 y y 0 0
[ 1581.001] (II) intel(0): [drm] Xorg 2405 0 n y 0 0
[ 1581.001] (EE) intel(0): Failed to claim DRM device.
[ 1581.002] (II) UnloadModule: "intel"

What is wrong with this xorg.conf?