Re: ukbd: short freeze when activating LEDs

From: Chris Ruiz <yr.retarded_at_gmail.com>
Date: Sun, 18 Oct 2009 12:14:48 -0500
On Sun, Oct 18, 2009 at 7:50 AM, Stefan Ehmann <shoesoft_at_gmx.net> wrote:
> On Saturday 05 September 2009 20:29:29 Ed Schouten wrote:
>> * Hans Petter Selasky <hselasky_at_c2i.net> wrote:
>> > On Saturday 05 September 2009 16:32:55 Stefan Ehmann wrote:
>> > > Whenever I press capslock/numlock, the system shortly (< 0.5 ms)
>> > > freezes.
>> >
>> > It might also be because the USB keyboard driver is using Giant, which
>> > can be congested.
>>
>> For half a second? I experience the same issue. I also have the same
>> issue with the Syscons VGA driver when switching windows. Some time ago
>> I talked about this with some other people and it may be possible it has
>> something to do with SMIs. Not sure...
>>
>
> Recently, I got an off-list response pointing me the "Other" section of
> http://wiki.freebsd.org/BugBusting/Commonly_reported_issues:
> "When switching consoles (e.g. Alt-F2 to switch to ttyv1), a 2-3 second delay
> is experienced"
>
> The suggested workaround (hint.kbdmux.0.disabled="1") also helps in my case.
> So it's not necessarily USB-related.

I'm my experience the "switching consoles" delay goes away when you
remove atkbd and related options from your kernel if you only have a
usb keyboard.  I don't have that delay with kbdmux left compiled in.
The delay most likely has something to do with locking, re: GIANT.

-- Chris

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Received on Sun Oct 18 2009 - 15:14:49 UTC

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