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

[George Shuklin <george.shuklin@xxxxxxxxx>]

Check if only one connection to VNC and no any other interaction with
xenconsoled (in case of text PV text).

Ð ÐÐ., 21/03/2011 Ð 10:33 -0400, Garrett Robinson ÐÐÑÐÑ:
> 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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> http://lists.xensource.com/xen-users



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