[PATCH] does ukbd delay break scan codes?
Norbert Koch
NKoch at demig.de
Thu Feb 23 23:26:23 PST 2006
Hello Maksim,
yes I too looked at ukbd code and found the same.
I already put a patch on the bug list yesterday.
In the mean time I compared the ukbd code to
that of NetBSD and OpenBSD. Their code is
quite different. I expect that the DragenFlyBSD
guys may have the same problem, but did not
find their cvs web site so far.
Norbert
>
> Maksim Yevmenkin wrote:
>
> [...]
>
> >>> I still do not know where it comes from,
> >>> but what I found so far is,
> >>> that the usb keyboard (or ukbd driver)
> >>> seems to delay the break codes for
> >>> keys with prefix E0 (which may or may not
> >>> have anything to do with my problem).
> >>>
> >>> E.g., I press Keypad-Enter and see
> >>> E0 1C E0
> >>> ^prefix
> >>> ^make code
> >>> ^prefix
> >>> and nothing else. As soon as I press
> >>> e.g. Enter (any key works) I see
> >>> 9C 1C 9C
> >>> ^break code
> >>> ^make code
> >>> ^delayed break code.
> >>>
> >>> Does anyone have an idea where that
> >>> may come from?
> >>
> >>
> >> i see this to on week old -current. if ukbd(4) delays break code then
> >> this might explain state synchronization problem with kbdmux(4). i
> >> guess we should start digging into ukbd(4), starting with
> >> ukbd_interrupt() to see why this happening.
> >
> >
> > just by looking at the code, i think, that ukbd_check_char()
> should also
> > return "true" if ks_buffered_char[0] != 0, i.e. try the following
> > untested patch
>
> i have tested the attached patch. it works for me. with this patch usb
> keyboard return
>
> Feb 23 17:30:54 beetle kernel: e0 1c
> Feb 23 17:30:54 beetle kernel: e0 9c
>
> when i press "gray enter" key and ps/2 keyboard return
>
> Feb 23 17:31:41 beetle kernel: e0
> Feb 23 17:31:41 beetle kernel: 1c
> Feb 23 17:31:41 beetle kernel: e0
> Feb 23 17:31:41 beetle kernel: 9c
>
> also i tried to freeze my keyboards by pressing ctrl+f1 but i can not
> reproduce it here.
>
> thanks,
> max
>
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