Re: 2.6.24-rt1 SSttrraannggee keyboard behaviour

[Clark Williams <williams@redhat.com>]

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Uli Brueggemann wrote:
> Hi,
> 
> I'm trying to use 2.6.24-rt1 in combination with BruteFIR (audio). So
> far everything looks fine except:
> 
> After starting BruteFIR (which is doing its job) after a while the
> keyboard responds like with double clicks. TTeerrrriibbllee. I cannot
> enter a command anymore. The running BruteFIR itself still is running
> stable.
>  The system without starting BruteFIR keeps stable. BruteFIR itself is
> working fine with older kernels. Also with e.g. 2.6.24-rc3-zen3. So I
> guess the realtime patch is causing this.
> BTW Brutefir is using realtime priorities 1 to 4 and it also uses SCHED_FIFO.
> 
> Any idea?
> 
> Uli

Uli,

I've seen this behavior before; on my system in addition to the doubled keystrokes,
cursor animations were jerky.

Are you running on a 64-bit kernel, is your clocksource hpet and is vsyscall64 on?

$ uname -m
x86_64
$ cat /sys/devices/system/clocksource/clocksource0/current_clocksource
hpet
$ cat /proc/sys/kernel/vsyscall64
1

If so, try putting this into your /etc/sysctl.conf and rebooting:

# vsyscall64 off
kernel.vsyscall64 = 0

You could try echoing "1" into /proc/sys/kernel/vsyscall64, but with the keyboard
doubling issue, it might be a problem :)

Clark
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