[Debian-eeepc-devel] Bug#598097: eeepc-acpi-scripts: `gdm3` uses different `XAUTHORITY` file (was: vga toggling not working: `xrandr -q`: No protocol specified)

[Paul Menzel]

Am Freitag, den 12.11.2010, 12:47 -0400 schrieb Ben Armstrong:
> On 12/11/10 12:34 PM, Paul Menzel wrote:
> > What display manager and DE are you using?
> 
> gdm3 and LXDE (openbox).
> 
> > It is owned by by my user.
> > 
> >         $ ls -l /home/paul/.Xauthority 
> >         -rw------- 1 paul paul 1238 12. Nov 00:15 /home/paul/.Xauthority
> 
> OK. This is very strange:
> 
> synrg at shade:~$ su -
> Password:
> root at shade:~# xeyes           # a nice quick test if display works :)
> root at shade:~# xauth
> Using authority file /var/run/gdm3/auth-for-synrg-MXsbdM/database
> xauth> exit
> root at shade:~# export XAUTHORITY=/dev/null
> root at shade:~# xauth
> Using authority file /dev/null
> xauth> exit
> root at shade:~# xeyes           # even after pointing at a
>                               # bogus XAUTHORITY, xeyes still shows!
>                               # say what?

Thank you for your test case. I discovered this works for me too until I
run `detect_x_display`.

        $ sudo su -
        machine:~# xrandr
        Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 4096 x 4096
        VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 337mm x 270mm
           1280x1024      75.0*    60.0
           1024x768       75.1     75.0     70.1     60.0
           832x624        74.6
           800x600        72.2     75.0     60.3     56.2
           640x480        72.8     75.0     66.7     60.0
           720x405        70.0
           720x400        70.1
        LVDS1 connected (normal left inverted right x axis y axis)
           800x480        60.0 +
           640x480        85.0     72.8     75.0     59.9
           720x400        85.0
           640x400        85.1
           640x350        85.1
        TV1 disconnected (normal left inverted right x axis y axis)
        machine:~# . /usr/share/acpi-support/eeepc-acpi-scripts/lib/functions.sh
        machine:~# xrandr
        Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 4096 x 4096
        VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 337mm x 270mm
           1280x1024      75.0*    60.0
           1024x768       75.1     75.0     70.1     60.0
           832x624        74.6
           800x600        72.2     75.0     60.3     56.2
           640x480        72.8     75.0     66.7     60.0
           720x405        70.0
           720x400        70.1
        LVDS1 connected (normal left inverted right x axis y axis)
           800x480        60.0 +
           640x480        85.0     72.8     75.0     59.9
           720x400        85.0
           640x400        85.1
           640x350        85.1
        TV1 disconnected (normal left inverted right x axis y axis)
        machine:~# detect_x_display
        machine:~# xrandr
        No protocol specified
        Can't open display :0

Now I compared the environment variables before and after running
`detect_x_display`. `XAUTHORITY` is set to som

        machine:~# env | grep XAUTHORITY
        XAUTHORITY=/var/run/gdm3/auth-for-paul-Hwcbtn/database
        machine:~# detect_x_display
        machine:~# env | grep XAUTHORITY
        XAUTHORITY=/home/paul/.Xauthority
        machine:~# ls -l /var/run/gdm3/auth-for-paul-Hwcbtn/database
        -rw------- 1 paul paul 52 13. Nov 05:27 /var/run/gdm3/auth-for-paul-Hwcbtn/database # probably created at login time
        machine:~# ls -l /home/paul/.Xauthority
        -rw------- 1 paul paul 106 13. Nov 05:29 /home/paul/.Xauthority


Thanks,

Paul
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