IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 3 March 2016   (all times are UTC)

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18:09
<lbssousa>
alkisg: Remember that Xephyr patches for single-GPU multi-seat support I was working on? They were finally upstreamed! :) https://cgit.freedesktop.org/xorg/xserver/log/?qt=author&q=La%C3%A9rcio+de+Sousa
18:10
<alkisg>
lbssousa: cool! Does that mean that multiseat will work out of the box in e.g. ubutnu 16.04.2?
18:19
<lbssousa>
alkisg: These patches should be released in version 1.19, which (I hope) will be released in time for 16.10 (and backported to 16.04.1).
18:19
<alkisg>
lbssousa: and what do those patches do?
18:20
And, what state is multiseat in, in recent xorg versions?
18:21
(I mean, can e.g. schools use multiseat, or is it something too hard for them to setup?)
18:22
<lbssousa>
I've filed a bug asking for backporting of these patches for 16.04 (https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1540997) Now that 1.18.1 in is xenial-proposed, who knows they pull them in?
18:23
Well, these patches bring proper input hot-plugging support for Xephyr, a must-have feature for multi-seat purposes.
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18:24
<alkisg>
Multiseat is implemented via xephyr? Isn't it possible to do multiseat with native xorg?
18:25
<vagrantc>
maybe it's a lot harder
18:26
<alkisg>
lbssousa: do you have a recent tutorial on how people can install/use multiseat?
18:26
<lbssousa>
You'll need to handle a bare X server on top of which your Xephyr instances will be launched. It's easy to do if xorg-server is built with systemd socket-activation support enabled. I've put a sample configuration in https://lists.x.org/archives/xorg-devel/2016-March/048917.html
18:26
<vagrantc>
so, this would allow a single fat client to serve multiple users?
18:27
(or thin client, i guess)
18:27
<lbssousa>
Provided your display manager has proper multi-seat support, yes. Currently only gdm and lightdm do.
18:29
Multi-seat with Xephyr is for a very special case where you have e.g. two seats on a single GPU with two outputs.
18:29
<alkisg>
That's a very common hardware setup though, where multiseat would actually be useful
18:30
<lbssousa>
Ordinary multi-seat (I mean "a dedicated GPU for each seat") is already supported by Xorg. Xephyr is not needen in this case.
18:30
<vagrantc>
i remember people being very excited about multiseat ~10 years ago ... glad to see it's finally made some progress again!
18:32
<lbssousa>
My school lab consists of 2-seat or 3-seat computers with an integrated Intel graphics device and a Silicon Motion SM 501 PCI (yes, PCI!) card with two VGA outputs.
18:33
<alkisg>
It would be a nice hardware upgrade path, to buy new systems to make them multiseat fat clients at first, then when they get a bit older to use them as normal fat clients, and when they're too old, as thin clients :)
18:33
<vagrantc>
alkisg: hah!
18:34
<lbssousa>
Unfortunately, I can't use a PCI-e graphics card toghether with my integrated Intel graphics.
18:34
<alkisg>
(unrelated) /me did about 20 wheezy/lxde installations today... 10 minutes per clone :P :D
18:35
(sending old pcs to schools, no computer labs / no ltsp involved)
18:35
<vagrantc>
alkisg: old graphics cards?
18:35
if wheezy LTS works out... that should be good for another 2-3 years :)
18:35
<alkisg>
They're pentium 3's with 256 MB RAM, so I was looking for something small and light
18:36
Some of the hard disks are <10 GB, so wheezy/lxde fits fine there, being only 3 GB
18:36
I prepared a stretch one too, but I haven't optimized it yet, so it needs more than 256 MB RAM
18:37
With single mode + nodm, I hope I'll be able to boot it even with 64 MB RAM (so that much is left for the applications out of the 256 that they have available)
18:38
<vagrantc>
single mode?
18:38
no network?
18:52
<alkisg>
Passing "single" in the command line disables a whole lot of services, saving ram, but does run dhclient for network
18:53
And with a replacement for sulogin or what's it's called, that calls nodm to autologin as the user, one can have lxpanel in under 64 MB RAM
18:54
<vagrantc>
wow
18:54
any notable missing services?
18:56
<alkisg>
Outside the session, nah
18:56
Inside the session, gvfs for hotplugging usb sticks or cameras
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19:04
<lbssousa>
vagrantc: we know a lot of people hate systemd, but current multi-seat status (much better than 10 years ago) will probably never be possible without it.
19:05
Even the seat abstraction itself (and proper hardware assignment between seats) only came with udev + systemd-logind.
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