Hi,
I've recently attempted running a full GNOME 3 session on a remote display,
and I've now hit a pretty big roadblock.
My use case for doing this is that I'm running Fedora 17 as a
fully-virtualized domU on Xen and I figured I might get slightly better
performance if the session used the dom0's display directly instead of
emulating a VESA card and forcing me to connect via VNC.
I can get a fully working fallback session by setting the DISPLAY
environment variable to a suitable value, enabling ssh's X forwarding and
executing gnome-session from inside the domU, so the building blocks are
there. As soon as I launch gnome-shell, however, I get the following
error messages:
-----
Window manager warning: Log level 16: NOTE: Not using GLX TFP!
Window manager warning: Log level 16: The program 'gnome-shell' received
an X Window System error.
This probably reflects a bug in the program.
The error was 'BadShmSeg (invalid shared segment parameter)'.
(Details: serial 1364 error_code 148 request_code 140 minor_code 4)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the GDK_SYNCHRONIZE environment
variable to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
-----
I don't have a solid background in X programming, but these error messages,
along with a bit of searching around the net, have led me to believe that
the problem is caused by the fact that the XShm extension doesn't work for
remote displays.
Is there a way to prevent GNOME Shell from using that extension? If that's
not the case, how difficult would it be to add support for it? My use case
might be pretty specific, but I'm sure people deploying thin clients would
love to be able to run GNOME Shell on a remote display.
Cheers.
PS: Please CC: me as I'm not subscribed to the list.
--
Andrea Bolognani <eof kiyuko org>
Resistance is futile, you will be garbage collected.
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