Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lightdm (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/903194
Title:
multiseat not set up correctly
Status in Light Display Manager:
New
Status in “lightdm” package in Ubuntu:
Confirmed
Bug description:
I have a multiseat xorg.conf setup on Arch Linux (with ServerLayouts
called seat-chris and seat-brynn)
Based on the below details, it seems that -sharevts is needed, but not
handled correctly by lightdm
If I use a fairly minimal config, I get:
When lightdm starts, Seat 0 is activated
Ctrl-Alt-F8 on Seat 0 kbd activates Seat 1 (deactivates Seat 0)
Ctrl-Alt-F7 on Seat 1 kbd activates Seat 0 (deactivates Seat 1)
lightdm.conf:
--------------------
[LightDM]
start-default-seat=false
[SeatDefaults]
session-wrapper=/etc/lightdm/Xsession
xserver-config=xorg.conf.multiseat
[Seat:0]
xserver-layout=seat-chris
[Seat:1]
xserver-layout=seat-brynn
pstree
-----------
lightdm,9833 /etc/init.d/lightdm start
`-lightdm,9834
|-X,9839 :0 -config xorg.conf.multiseat -layout seat-chris -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
|-X,9841 :1 -config xorg.conf.multiseat -layout seat-brynn -auth
/var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
|-lightdm-gtk-gre,9860
| `-{lightdm-gtk-gr},9861
|-lightdm-gtk-gre,9881
| `-{lightdm-gtk-gr},9882
|-{lightdm},9837
|-{lightdm},9840
|-{lightdm},9863
`-{lightdm},9884
When I use the sharevts flag on Seat 1, I see the following:
On lightdm start, Seat 0 is activated
After a second or so, Seat 0 goes blank, and Seat 1 is activated
Pressing Ctrl-Alt-F7 on Seat 1 activates Seat 0 again, and I can log in on
both correctly
lightdm.conf
-----------------
[LightDM]
start-default-seat=false
[SeatDefaults]
session-wrapper=/etc/lightdm/Xsession
xserver-config=xorg.conf.multiseat
greeter-hide-users=false
[Seat:0]
xserver-layout=seat-chris
[Seat:1]
xserver-command=/usr/bin/X -sharevts
xserver-layout=seat-brynn
pstree
-----------
lightdm,21164 /etc/init.d/lightdm start
`-lightdm,21165
|-X,21171 :0 -config xorg.conf.multiseat -layout seat-chris -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
|-X,21173 -sharevts :1 -config xorg.conf.multiseat -layout seat-brynn
-auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
|-lightdm-gtk-gre,21192
| `-{lightdm-gtk-gr},21193
|-lightdm-gtk-gre,21210
| `-{lightdm-gtk-gr},21211
|-{lightdm},21168
|-{lightdm},21172
|-{lightdm},21195
`-{lightdm},21215
If I try sharevts on both sessions, I see the following:
On lightdm start, Seat 1 starts up
Seat 0 shows a mouse pointer on a text mode console printing the kernel
message 'Invalid Framebuffer ID'
If I force kill lightdm and restart it using the init.d service, then it
starts correctly
lightdm.conf
------------------
[LightDM]
start-default-seat=false
[SeatDefaults]
session-wrapper=/etc/lightdm/Xsession
xserver-config=xorg.conf.multiseat
greeter-hide-users=false
[Seat:0]
xserver-command=/usr/bin/X -sharevts
xserver-layout=seat-chris
[Seat:1]
xserver-command=/usr/bin/X -sharevts
xserver-layout=seat-brynn
pstree
--------
lightdm,32594 /etc/init.d/lightdm start
`-lightdm,32595
|-X,32599 -sharevts :0 -config xorg.conf.multiseat -layout seat-chris
-auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
|-X,32603 -sharevts :1 -config xorg.conf.multiseat -layout seat-brynn
-auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
|-lightdm-gtk-gre,32620
| `-{lightdm-gtk-gr},32623
|-lightdm-gtk-gre,32640
| `-{lightdm-gtk-gr},32643
|-{lightdm},32598
|-{lightdm},32600
|-{lightdm},32645
`-{lightdm},4109
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