Re: temporary freezes when pressing capslock / numlock

On Sat, May 24, 2008 at 01:38:08PM +1000, Fraser Tweedale wrote:
Since upgrading to RELENG_7_0 I was experiencing momentary freezes (of
about .5 seconds) whenever the capslock or numlock buttons were pressed.

Let me guess -- you're using a USB keyboard.

The issue occurs both in console and in X, and for both ULE and 4BSD. The
problem was reproducible with USB keyboards only (ukbd); atkbd seems fine.
It also occurs when numlockx is used to set numlock on or off without
keyboard interaction.

I figured as much. I hadn't checked numlock/capslock myself, but vcons
switching also has that problem. Yes, it's semi-documented; see section
"USB" below:

http://wiki.freebsd.org/JeremyChadwick/Commonly_reported_issues

For what it's worth, the systems I've confirmed the problem on are Intel
and nForce 4. Meaning, the issue is not specific to a single chipset.

Interestingly, if you add enough keyboards, the problem vanishes, which led
me to kbdmux. Sure enough, removing device kbdmux from the kernel makes
the problem go away (at the expensive of some functionality of course, but
this is my current workaround).

An interesting find! I'll add this to the details in the above wiki.
I've also CC'd kbdmux's maintainer.

--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |

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