Bug 102307

Summary:	Weston fails to run on seat1, because it needs a TTY. Only seat0 has TTYs
Product:	Wayland	Reporter:	n3rdopolis <bluescreen_avenger>
Component:	weston	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED NOTABUG	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description n3rdopolis 2017-08-19 03:25:40 UTC

Hi

I am trying to start weston on a second XDG_SEAT
Unless if I am missing something, or there is a way to emulate a full TTY (not just a PTY) Only seat0 allows TTYs

In my testing, I start bash on seat1 with
systemd-run --setenv=XDG_SEAT=seat1 -p PAMName=login -p User=username -t bash

and then try to start Weston
weston --seat=seat1

I get "logind: session not running on a VT"
I even try to specify --tty=/dev/ttyX , and get the same error.

I tried to use the weston-launch, and weston-launch then wants to run on a VT as well...

Am I missing something? I don't know if it is possible to associate TTYs with seats other than seat0 based on some things I read...

Thanks

Comment 1 Daniel Stone 2017-08-21 12:07:46 UTC

I believe you need to associate your login session with that seat; every session is created on a particular seat.

Comment 2 n3rdopolis 2017-08-21 12:54:43 UTC

Hi. It is associated with the seat, sorry I wasn't clear, I discovered that I can set the logind seat to seat1 with systemd-run by specifying --setenv=XDG_SEAT=seat1 ...
...when I run loginctl, it appears as seat1

Comment 3 Pekka Paalanen 2017-08-22 07:43:56 UTC

I wonder, perhaps ideally the choice of the KMS device(s) should dictate if a TTY is needed or not. If the KMS device is used for TTYs, then we need to tell the TTY to back off properly, but if it is not, then I suppose we should not care about the TTY.

I suppose the seat assignments via udev should be good for that?

Oh... the same goes for the input devices.

And if there is no TTY, weston should disable the VT-switching key bindings.

Maybe all that could also allow running Weston on kernels with CONFIG_VT=n.

Or, does Weston just have superfluous TTY/VT checks when it's using logind, and otherwise everything would just work?

Comment 4 n3rdopolis 2017-08-22 11:15:39 UTC

For the second question
I could try to disable the checks... ...but I might have to do some grepping to find out how to do that... 
I am willing to test a temporary patch...

Comment 5 n3rdopolis 2017-08-28 02:15:49 UTC

I made https://lists.freedesktop.org/archives/wayland-devel/2017-August/034860.html
It seems to work

Comment 6 Daniel Stone 2018-06-04 07:13:24 UTC

Closing this bug so we can discuss patches on the list instead.

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