Bug#851941: since version 2:1.19.1-1 xserver-xorg-legacy ignores settings in Xwrapper.config

[Tiziano Zito <opossumnano@gmail.com>]

Package: xserver-xorg-legacy
Version: 2:1.19.0-3
Severity: important

Starting from version 2:1.19.1-1 the settings in Xwrapper.config are ignored.

In a system with systemd, I start the Xserver from /etc/rc.local with:

su -l myusername -c 'exec startx -- vt4 >> /tmp/xsession-errors 2>&1'

i.e. X is started from a user which is not logged in a console. This 
simulates the "autologin" feature of some display managers. No display 
manager is installed on this machine.

Until version 2:1.19.0-3 this works like a charm if /etc/X11/Xwrapper.config contains:

needs_root_rights=yes
allowed_users=anybody

Starting from 2:1.19.1-1, X does not start anymore and fails with:

[    63.770] (EE)
Fatal server error:
[    63.773] (EE) xf86OpenConsole: Cannot open virtual console 
4 (Permission denied)
[    63.774] (EE)
[    63.776] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[    63.782] (EE) Please also check the log file at "/home/tiziano/.local/share/xorg/Xorg.0.log" for additional information.
[    63.784] (EE)
[    63.785] (WW) xf86CloseConsole: KDSETMODE failed: Bad file descriptor
[    63.785] (WW) xf86CloseConsole: VT_GETMODE failed: Bad file descriptor
[    63.785] (EE) Server terminated with error (1). Closing log file.

If I login in the console, I can start X with "startx", but I can not 
start on a different console from that I am logged into, i.e. 
"startx -- vt4" fails with the same error.

I don't see anything in the package changelog that would explain the problem.

Reverting to 2:1.19.0-3 fixes the problem.

Thanks!
Tiziano

-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages xserver-xorg-legacy depends on:
ii  debconf [debconf-2.0]  1.5.59
ii  libaudit1              1:2.6.7-1
ii  libc6                  2.24-9
pn  xserver-common         <none>

xserver-xorg-legacy recommends no packages.

xserver-xorg-legacy suggests no packages.

-- debconf information:
  xserver-xorg-legacy/xwrapper/actual_allowed_users: anybody
  xserver-xorg-legacy/xwrapper/allowed_users: Anybody