Bug#771444: gnome-session-flashback: gnome-fallback-session fail with "software acceleration check failed" message

[Jan Thomsen]

Package: gnome-session-flashback
Version: 3.14.0-3
Severity: important
Tags: upstream

Dear Maintainer,

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I was trying to run gnome desktop on my Debian jessie host, to be displayed on
an Xming X11 server on my Win7 x64 laptop.
I start the session from a putty ssh client with X11 forwarding enabled, which
has worked for me for the longest time
(and still does) from a Debian Wheezy host.

The problem is the same no matter which session type I start:

gnome-session
gnome-session --session=gnome-classic
gnome-session --session=gnome-flashback

I see the following error messages when I try to run the flashback session

jan at neon:/usr/share/gnome-session/sessions$ gnome-session --session=gnome-
flashback

** (gnome-session-check-accelerated:21700): WARNING **: Couldn't connect to
accessibility bus: Failed to connect to socket /tmp/dbus-NFiQWMKAFv: Connection
refused
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256

** (gnome-session-check-accelerated:21704): WARNING **: Couldn't connect to
accessibility bus: Failed to connect to socket /tmp/dbus-NFiQWMKAFv: Connection
refused
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256

** (process:21695): WARNING **: software acceleration check failed: Child
process exited with code 1

It ***does*** open an X11 window on my destop, but with a big unhappy icon in
the middle of the screen saying :  Oh no, Something has gone wrong !  And offer
me the option to hit a button to close.

Above messages are from gnome-session-flashback 3.8.1-7.  I followed a
recommendation and tried to install a newer version from experiemental, but
that failed also, but without opening a window
and a slightly different set of error messages.

Based on similar posts from Ubuntu users, I am under the ipression that the
problem is related to video accceleration.  I have tried to enable GLX on my
Xming server, but the result is the same.

Gnome3 runs perfectly fine native on the host I am starting it from, but I
would like to be able to access it over the network too.  At the moment I am
stuck with Xfce4, but I like to access all
my hosts using the same desktop layout and tools.

b.r.
Jan Thomsen



-- System Information:
Debian Release: jessie/sid
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gnome-session-flashback depends on:
ii  gnome-flashback                      3.10.0-1
ii  gnome-panel                          3.8.1-7
ii  gnome-screensaver                    3.6.1-2
ii  gnome-session-bin                    3.14.0-2
ii  gnome-session-common                 3.14.0-2
ii  gnome-settings-daemon                3.14.1-1
ii  metacity                             1:3.14.1-2
ii  nautilus                             3.14.1-2
ii  notification-daemon                  0.7.6-2
ii  policykit-1-gnome                    0.105-2
ii  xfce4-notifyd [notification-daemon]  0.2.4-3

Versions of packages gnome-session-flashback recommends:
ii  gnome-power-manager  3.14.1-1

Versions of packages gnome-session-flashback suggests:
ii  desktop-base      7.0.3
pn  gnome-keyring     <none>
ii  gnome-user-guide  3.14.1-1

-- no debconf information