Re: kbdmux oddity ?

On Tue, May 09, 2006 at 05:01:30PM -0700, Pascal Hofstee wrote:

Today i got to actually installing a kbdmux enabled kernel and came to
the conclusion that even though keys like Capslock, Numlock and
Scrolllock perform the functions they're supposed to do, the keyboard
leds seem to arbitrarily decide wether or not they want to toggle
on/off.

on console i noticed that usually after hitting e.g. caps lock a few
times the leds decdide to "work with me again" and toggle on/off
accordingly .. until i hit any actual textual input .. at which point
the previous eratic behavior has resurfaced.

Similar problems exist in X as well ... though seem to be even more
eratic there.

Removing kbdmux from my kernel seems to restore normality again.

Emil Mikulic <emil at cs.rmit.edu.au> wrote:

I'm seeing a similar (but different?) problem - I get an interrupt storm
every time I hit Caps Lock or Num Lock, or flip VTs in text mode. If
XMMS is running, the music skips.

Normally, if I'm hitting letter keys, I never see any irq1: atkbd0
interrupts. If I bounce on the Caps Lock, I can get it as high as
72/sec.

Running top(1), I can get system time up to about 50% by pounding away
at Caps Lock. Normal typing doesn't affect the system time much, it
fluctuates between 0% and 1%.

This is with 7-CURRENT, GENERIC, on x86, from yesterday. And it's on a
Dell GX280 with a USB keyboard. I've seen similar issues on a Dell
Poweredge SC430, again with a USB keyboard.

If I add hint.atkbd.0.disabled="1" to /boot/loader.conf,
I no longer see this problem.

Maksim Yevmenkin <maksim.yevmenkin at savvis.net> wrote on May 10, 2006:

i can not reproduce it here with dell latitude d610 laptop. i think,
that this maybe particular usb keyboard/bios fault. kbdmux(4) really
does not do anything except switching slave keyboards into "raw" mode
and pass all scancodes to the upper layers. it seems like kbdmux(4)
exposes all the little problems with low level keyboard drivers.

again, i'm looking into this, but i do not have much time right now.

FreeBSD 6.1-RELEASE-p2, Abit BE6-II motherboard made in 2000 or 2001,
PS/2 keyboard, no USB keyboard. In console the Caps Lock key works,
but the Caps Lock LED doesn't lit up at all. In X the LED works OK.

Adding hint.kbdmux.0.disabled="1" to /boot/device.hints
made the Caps Lock LED to work in console again.

Lena
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