Re: Why does virtmanager (VNC) console get stuck in caps lock mode?

[Stephen Hemminger <shemminger@vyatta.com>]

On Fri, 30 Jul 2010 16:11:50 -0500
Anthony Liguori <anthony@codemonkey.ws> wrote:

> On 07/30/2010 03:39 PM, Stephen Hemminger wrote:
> > As an emacs user, I remap caps-lock to CTRL key in normal usage.
> > But often in KVM console VNC window, it gets stuck in caps lock mode.
> >    
> 
> Try passing no-lock-key-sync to the -vnc option.  If you're using 
> virt-manger, that may be challenging without hacking libvirt.
> 
> But you could also try using qemu directly and then using gvncviewer.

And I could go back to telnet as well...

> > This appears to be a new mis-feature, since it never used to get stuck
> > before (not sure whether is kernel, virt-manager or QEMU).
> >
> > Any clues?
> >    
> 
> There's a few possibilities.  The first is that you don't have the 
> guest's keymap setup to treat caps lock as ctrl.  I imagine you do though.

Already done (via Gnome preferences)

> The second, more likely, possibility is that our caps lock detection 
> heuristics are being defeated because you're remapping the key.
> 
> The above option disables our heuristics.  If that "fixes" the problem 
> then we probably need to add some bits to further handle it.  The real 
> source of the problem is that we can receive key down events but if 
> focus moves we won't receive the key up.  That can create subtle 
> problems where you're pressing control and release it after switching 
> windows.  The effect is the guest sees control as being stuck.
> 
> We do our best to work out this situation but it's not necessarily perfect.
> 
> Regards,
> 
> Anthony Liguori

Ideally you could read keymap and respond accordingly, but that maybe
too hard.


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