Scroll Lock in XFCE will not switch KVM

[Tim]

On 19/01/12 03:32, Todd Pytel wrote:
> On Wed, 2012-01-18 at 21:48 -0500, Greg Folkert wrote:
>> What kernel are you running?
> 3.0.0
>
>
>> This seems to me to not be an XFCE issue.
> Definitely possible, and I just found a workaround noted below. But I'd
> still like to understand how this behavior *actually* works under the
> hood, because this problem keeps popping up every year or two and has
> been for the last 10 years now. It's annoying.
>
> Here's what I can definitely say:
>
> 1) Scroll Lock switch works fine in the console - no tweaks necessary.
> This suggests it is not a kernel issue.
>
> 2) In XFCE, the Num Lock LED works, but the Scroll Lock one does not.
> Neither triggers the KVM. Adding the key via xmodmap gets the Scroll
> Lock LED working, but still doesn't get the KVM switching.
>
> 3) Openbox behaves identically to XFCE. I know Openbox used to switch
> properly long, long ago, but I only keep it around as a backup WM and
> haven't used it regularly in many years.
>
> 4) I don't have a working GNOME install to test with anymore, as I tore
> it all out in disgust a few weeks ago. I really don't want to pull it
> all back in.
>
> Now, here's the workaround... after some digging, I remembered an
> earlier trick about using xset to twiddle the LED's. Sure enough,
> doing...
>
> xset led 3&&  sleep 0.2&&  xset -led 3
>
> ...toggles the LED *and* switches the KVM. Yay! What's kind of weird is
> that it does this even without the xmodmap line, when the LED doesn't
> otherwise work.
>
> I guess this all suggests that something changed about X11's key
> handling? But I sure don't understand what's going on. Why would "xset
> led" trigger the KVM when the xmodmap'd key doesn't (even though it also
> toggles the LED and registers in xev).
>
> Anyway, I'll take it to the xorg list and see if anyone there has some
> insight. Though at this point, I can surely hack together a script and
> bind it to Scroll Lock or some other key.
>
> Thanks for pointing me to more general solutions, Greg.
>
> --Todd
>
>
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I have Kernel 3.1.0-1-686-pae, I am not sure if I still have a 2.*.* 
series kernel on my machine to test possible kernel. I will try your 
xset workaround on my PC later tonight.

Tim