Key repeat freezes emacs under Gnome 3/CentOS 7

[reswaney]

Hi,

I am running NoMachine-workstation_4.5.0_1_x86_64.rpm on CentOS 7 with
Gnome 3 desktop (as a virtual display).  Remote access to the server
is via Enterprise Client on Windows 7.

In Emacs, holding down a key repeat freezes Emacs within from 20 to a
few hundred characters.  The key repeat characters are displayed in a
visibly jerky way (until the point of freeze).  Also, the Emacs
response is always a bit sluggish in general.  After freezing, it is
necessary to end the process (the window-close button works).  (The
mouse/cursor movement and the rest of the applications in the desktop
session remain unaffected.)

An odd thing: The above is always the behavior when the emacs instance
is started as the normal login user.  However, if I start an emacs
from a shell running as root, the response is not sluggish and the
freeze-up does not occur.  This behavior is completely reproducible
and can be obtained repeatedly by starting user and root Emacs
processes within the same desktop session.

Running Emacs in the same kind of Gnome 3 session on the physical
display X server gives no problems for either user type.

The Emacs version is that provided by the CentOS distribution: GNU
Emacs 24.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.8.8) of
2014-06-09.

(The problem did not occur on the previous installation: RHEL 6,
NoMachine-workstation-update_4.4.1_3_i686.rpm,
emacs-el-1:23.1-21.el6_2.3 (x86_64))

Any advice for remedy would be appreciated.

[graywolf]

May you get a gdb backtrace of frozen emacs process?

[Author]

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