[systemd-devel] [RFC] Multiseat X sessions and Xorg configs
Hey guys, I'm currently working with a Plugable DisplayLink usb hub/adaptor for adding multi-seat support to an embedded PC formfactor. I've been running into difficulties with the changes to GDM and systemd with regards to multiseat support. For GDM, I've patched it to do the following... 1) In daemon/gdm-display.c where it currently checks if the seat != seat0. Rather than doing goto out; immediately, it queries the username. If the username is utilising the script method then let the automated login proceed. The script method will parse the login name as a script path if it ends with | character. 2) In daemon/gdm-simple-slave.c, rather than using a global level GDM_RAN_ONCE_FILE_MARKER, create one per seat. This allows the wants_autologin() to return True on a another seat rather than drop through to simply start_greeter(). 3) In daemon/gdm-slave.c, Export the GDM_SEAT_ID for the initial gdm slave display. This allows you to check the current seat in the script for item 1) above. That solved my gdm automated login process on the different seats. I've emailed the patch to the gdm list. However, I also ran into a problem with Xorg configurations. The host system runs on an embedded PC and has an xorg.conf.d Device entry for the Intel driver to enable certain options. However, this is global and caused problems with the displays on the other seats. e.g. with the second seat starting Xorg and looking for the Intel device as described in the xorg.conf.d file, rather than using the appropriate Frame-buffer device. I've patched the systemd/login/multi-seat-x.c to also pass over a -configdir parameter to the Xorg it launches. e.g '-configdir /etc/X11/xorg.conf.d/multi-session-x/seat-usb-pci- _00_1d_7-usb-0_3_1_4'. I'm not entirely confident that's the correct path I should be using. I've attached the patch for your comments/feedback. Thanks in advance, -- Glen Gray sla...@slaine.org multi-session-xorg-confdir.patch Description: Binary data ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [RFC] Multiseat X sessions and Xorg configs
On 16 Jul 2013, at 16:28, Lennart Poettering lenn...@poettering.net wrote: On Tue, 16.07.13 16:09, Glen Gray (sla...@slaine.org) wrote: However, I also ran into a problem with Xorg configurations. The host system runs on an embedded PC and has an xorg.conf.d Device entry for the Intel driver to enable certain options. However, this is global and caused problems with the displays on the other seats. e.g. with the second seat starting Xorg and looking for the Intel device as described in the xorg.conf.d file, rather than using the appropriate Frame-buffer device. I've patched the systemd/login/multi-seat-x.c to also pass over a -configdir parameter to the Xorg it launches. e.g '-configdir /etc/X11/xorg.conf.d/multi-session-x/seat-usb-pci- _00_1d_7-usb-0_3_1_4'. I'm not entirely confident that's the correct path I should be using. I figure both of these issues are better discussed in the gdm and X11 mailing lists rather than here. Agreed, however, given that systemd is currently patching the launch of Xorg for this environment, I thought I'd pass on my update which solves my version of the problem. Note that the multi-seat-x tool is on its way, see this thread: http://lists.x.org/archives/xorg-devel/2013-July/036866.html In this same thread there are discussions about adding a MatchSeat option to X. This really looks like what you are looking for? With that in place you could have configuration fragments that only apply to specific seats rather than all of them? Ok, probably best if I take this over the the xorg-devel list then. That looks like the conversation I'm interested in. Thanks, -- Glen Gray sla...@slaine.org ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
