I was running xserver-xorg-core 2:1.14.5-1 so far and updated to
version 2:1.16.0-2+b1 today, as well as going from an older kernel
version to linux-image-3.14-2-amd64 v3.14.15-2 as present in today's
Debian/jessie (also all the other packages on my system are up2date
with today's Debian/jessie).

I'm using xserver-xorg-video-intel with i915 driver on a Lenovo x230
laptop with:

| 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

and two external monitors, no custom xorg.conf and using the openbox
window manager.

When I switch from one virtual desktop in X.org to a different
desktop using the keyboard in the openbox window manager, it quite
often triggers:

| (II) AIGLX: Suspending AIGLX clients for VT switch

and as a result sadly causing a ~1sec delay until it's displaying
the desktop I am actually switching to (X.org doesn't crash though).
Amusingly this delay does NOT happen at all when I'm using the
*mouse* to switch between desktops using lxpanel.

Sadly I'm not yet aware which component is responsible for this
buggy behaviour, but according to
http://sources.debian.net/src/xorg-server/2:1.12.4-6%2Bdeb7u2/glx/glxdri2.c/?hl=625#L625
the log message comes from xserver-xorg-core, so reporting it in
case someone else explores this problem. If someone has any hints
what might cause this issue please let me know.

regards,
-mika-

* Michael Prokop [Wed Sep 17, 2014 at 03:10:45PM +0200]:

[...]

Alright, also no other key combination triggers this effect, so it's
really just the when switching desktops via Alt-F#. Might this be be
related to systemd/libsystemd-login0 looking for Alt-F# key events?

regards,
-mika-