[arch-general] ACL on /dev nodes (systemd, lightdm)

[Jan Steffens]

On Fri, Dec 2, 2011 at 7:38 PM, Damjan <gdamjan at gmail.com> wrote:
> Hi all,
> I know systemd and lightdm are not exactly kosher on ArchLinux, but any
> help would be welcome.
>
> So, I just noticed that OpenGL is using llvmpipe on my laptop, and then
> I found out that the /dev/dri/card0 node doesn't have the proper ACL set
> to allow access to my user. Also my user is not in the video group -
> since I've learned that's not necesseary in "modern" Linux configurations.
>
> Considering that I'm running systemd and using lightdm as a login
> manager - my question is, what subsystem is responsible for settings the
> ACL:
> - ConsoleKit
> - PolicyKit
> - systemd
> - lightdm
> ?
>
>
> Is the proper setup to have pam_loginuid.so, pam_ck_connector.so and
> pam_systemd.so in the PAM configuration for lightdm?
>
>
>
> the output of ck-list-session is:
> Session2:
>        unix-user = '1000'
>        realname = ''
>        seat = 'Seat1'
>        session-type = ''
>        active = TRUE
>        x11-display = ':0'
>        x11-display-device = '/dev/tty7'
>        display-device = ''
>        remote-host-name = ''
>        is-local = TRUE
>        on-since = '2011-12-02T18:23:04.193636Z'
>        login-session-id = ''
>
>
> --
> дамјан

With systemd running, it's responsible for setting the ACLs on the devices.
Try "systemd-loginctl list-sessions" and "systemd-loginctl
show-session X" (with X=session number). Your X11 session should be
active.