control: reassign -1 lightdm-gtk-greeter control: retitle -1 no hardware actions after first logout on systemd/logind systems On Sat, Dec 28, 2013 at 03:45:45PM +0100, Pascal Dormeau wrote: > Hi Yves-Alexis, > > Please find hereafter an explanation of the problem based on my personal > interpretation. Vincent has been very much involved in debugging so I > CC him too. > > * What is going on : > This happens when logind is running. > Before logout, we have at least one logind user session and one > logind lightdm session (implies that libpam-systemd is installed). > At logout, lightdm immediately starts a new session (and runs a new > lightdm-gtk-greeter process), then the former lightdm session is > removed, and only then the user session is removed. > So when the new lightdm-gtk-greeter process is launched, more than one > logind session exists. > lightdm-gtk-greeter checks if suspend, hibernate, restart, shutdown > are allowed using the > lightdm_get_can_suspend/hibernate/restart/shutdown() functions. > If one of those actions is not allowed, it is hidden from the power > menu, from beginning to end of the lightdm-gtk-greeter process. > If logind is running, power actions are allowed according > to /usr/share/polkit-1/actions/org.freedesktop.login1.policy. > For multiple-sessions, restart and hibernate are > allow_active "auth_admin_keep". > So at logout we have temporary a multi-sessions configuration implying > that hibernate and restart are not allowed. Because the power menu is > static inside a given lightdm-gtk-greeter process, hibernate and > restart remain forbidden even after only one lightdm session remains. > The bug could be in the way the different logind sessions are removed > and created at logout, but still, lightdm-gtk-greeter is unable to > track session changes (for instance, if someone else logs into a > VT). > > * proposal > The proposal is to check whether hibernate, restart, shutdown > are allowed, only when the power menu is opened. > The patch in attachment is doing this. > But BIG WARNING: > I spend only a couple of days digging into the GTK documentation > available on the web, it's all new for me. It might be dirty. > Check needed. Help also welcome for improvement (I guess there is a > smarter way to avoid those 5 new GtkWidget objects). > I run lightdm and lightdm-gtk-greteer with it, so far they behave as > expected (in particular, if I log in a VT resulting into a multiple > session situation, I can see the change in the menu).
Ok so in the end it's more like a race condition in the GTK+ greeter (which might happen in other greeters though). I'm reassigning to the correct package and will forward upstream. Thanks for the investigation. Regards, -- Yves-Alexis Perez
signature.asc
Description: Digital signature
