Re: Keyboard Stuttering

["Dmitry Torokhov" <dmitry.torokhov@gmail.com>]

On 10/6/06, David Gerber <dg-lkml@zapek.com> wrote:
> > I'm experiencing some severe keyboard stuttering on my laptop.  The
> > problem is particularly bad in X, and I believe it also occurs at the
> > console, though I'm having a difficult time verifying that.  The problem
> > shows up as repeated characters (not regular key-repeat-related), and
> > sometimes dropped key presses.
>
> (I'm not subscribed to the list, CC: to me if needed)
>
> Same problem here. Intel Core 2 Duo with 2.6.19-rc1 x86_64 SMP. Happens on
> 2.6.17 too. I use 'noapic' as a workaround but that disables one of the CPU
> core of course.
>
> I cannot reproduce the problem within the console nor gdm. Only on the X
> desktop.
>

John,

It looks like the only clocksource available on David's box is
"jiffies" although the processor shows that it supporst tsc and PM
timer is enabled and I think that this is what causes keyboard
stuttering in X. See http://bugzilla.kernel.org/show_bug.cgi?id=7291.
I believe clocksources is your turf, could you please take a look at
this.

Thanks!

-- 
Dmitry