[Xen-users] Re: Keyboard repeat error - VNC Xen virtual framebuffer

[Garrett Robinson <Garrett.Robinson@xxxxxxxxxxx>]

Thanks for the tip, Santosh - unfortunately, it does not appear to have helped.

I added "vga=0x314" to the Xen kernel command line in /etc/default/grub, ran update-grub, and rebooted the machine.

After using a VM for about 20 minutes, the problem recurred again. It is
 accompanied by a general slowdown and sluggishness in the frame buffer.
 When I first logged in, everything was quick and snappy, but after 20 
minutes or so the mouse feels sluggish and screen redraws are slow and 
very visible. Even running ls in the terminal or similar causes the 
output to be sloooowly drawn in the window in a noticeable way.

Here is a link to an example screenshot of the repeated keystroke 
problem:  http://i.imgur.com/9DMqy.png. After running the freesweep commnand and tapping return, the 
following output was given: including all of the following blank 
terminal prompts, caused by repeated "ghost" newlines.

Does anybody have any insight into this problem? Perhaps insight into 
how the two problems (repeated keystrokes and framebuffer slowdown) 
might be related?

I would really appreciate any advice or help.

Regards,
Garrett Robinson

On Mon, Mar 21, 2011 at 2:11 AM, Garrett Robinson <Garrett.Robinson@xxxxxxxxxxx> wrote:

Hello Xen-Users,

I am currently provisioning old Linux guests as HVM on a server, and giving clients access through VNC. The current setup uses the default Xen framebuffer as a VNC server (all configuration files have vnc=1 and  a few other settings), and my clients are using vinagre (a.k.a. Remote Desktop Viewer) on Arch as their VNC client.

Problem: Keyboard input is not consistently handled between the VNC client and VM. Sometimes keystrokes are dropped, more noticeably some seem to be repeated, sometimes many times. For example, tapping "Return" may send 10 or 20 newlines to a terminal. Sometimes this appears to bog down the VM and it essentially hangs for 30 sec. - 1 minute while random characters, sometimes just a steady stream of newlines that were not typed are spewed into the input.

Has anybody had experience with this or a similar problem? Google did not turn up much that was similiar, and certainly no solutions. Any help would be much appreciated, as this problem is quite aggravating and distracts from Xen's other great qualities!

Sincerely,
Garrett Robinson

--
Garrett Robinson
(484) 802-3882
Oberlin College '11

-- 
Garrett Robinson
(484) 802-3882
Oberlin College '11

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