VNC/x11vnc repeats charactors input

Message

clouds222 · Post by **clouds222** » Mon Mar 22, 2010 1:56 pm

I use vnc viewer 4 to connect to remote gnome desktop, but some times there's a problem pulsed me.

Sometimes when I input a charactor, it auto repeat the input with out stop, even I press the esc key, I can't stop it.

Did some one ever encountered the same problem? I don't know how to fix it.

papahuhn · Post by **papahuhn** » Mon Mar 22, 2010 2:08 pm

This may occur when vnc has missed the keyrelease event. What happens if you press the said key again and release it then?

clouds222 · Post by **clouds222** » Tue Mar 23, 2010 1:39 am

It do nothing when press the said key again.

I tried to disable the key repeat option in gnome-keyboard-properity. I don't know if this can resolve the problem.

krunge · Post by **krunge** » Sun Apr 04, 2010 1:11 pm

Are you seeing this problem?

http://ubuntuforums.org/showthread.php?t=1125694

There are a number of workarounds discussed there.

eccerr0r · Post by **eccerr0r** » Mon Apr 05, 2010 10:36 pm

I've seen this happen before and had to basically restart the remote X server because I have no access to the remote console to hit the offending key.

The suggestions posted on the x11vnc site:

Code: Select all

   x11vnc -R clear_mods
   x11vnc -R clear_keys
   x11vnc -R clear_locks
   x11vnc -R clear_all

don't always work.

Not sure if there's a way to actually tell the remote X server that "all buttons are currently released" or something... or perhaps something that can be fed into /dev/input... hmm...

krunge · Post by **krunge** » Wed Apr 07, 2010 1:55 pm

So running x11vnc with the '-repeat' option from the start didn't avoid the key-repeating problem?

BTW, which version of x11vnc are you running? It tries to automatically work around in this problem in version 0.9.8 and later.

eccerr0r · Post by **eccerr0r** » Wed Apr 07, 2010 2:47 pm

Looks like x11-misc/x11vnc-0.9.6 is the stable version in portage, perhaps a later version needs to be stabilized?
weird, thought earlier versions including 0.9.6 tries to disable key repeat, must be a different issue worked around...

krunge · Post by **krunge** » Fri Apr 09, 2010 8:11 pm

eccerr0r wrote:Looks like x11-misc/x11vnc-0.9.6 is the stable version in portage, perhaps a later version needs to be stabilized?
weird, thought earlier versions including 0.9.6 tries to disable key repeat, must be a different issue worked around...

Yes, for a very long time x11vnc's default has been to disable key-repeating in the X server when VNC viewers are connected.

The problem here is different. After 5 minutes of idle keyboard activity from the VNC viewer, x11vnc will re-enable keyrepeating in the X server, and then deactivates keyrepeating when the Viewer starts typing again. This has worked fine for years, but now there is a bug in GNOME (I think a11y) if x11vnc deactivates keyrepeating with any key down GNOME somehow makes the key repeat forever. Evidently with KDE the problem doesn't appear.

So it is x11vnc 0.9.8 and later that try to work around this GNOME bug. All it does is make sure all of the keys are up before deactivating keyrepeat.