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Subject: Re: BUG: pc_keyb.c
To: lars.segerlund@comsys.se (Lars Segerlund)
Date: Mon, 20 Aug 2001 11:26:16 +0100 (BST)
Cc: linux-kernel@vger.kernel.org, Andries.Brouwer@cwi.nl
In-Reply-To: <no.id> from "Lars Segerlund" at Aug 20, 2001 07:57:23 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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>   Due to writing to the status register before it's ready as far as I 
> can se.
> 
>   fix: change all mdelay(1) in pc_keyb.c to mdelay(2)'s .. ( mdelay(1) 
> will be on the timing limit.

Thats interesting. I thought the rule was 1mS. (There is indeed a timing
requirement). Any keyboard controller experts around ?

>   Might also be present during high load on machines running GL on AGP 
> video cards, not 100 % sure same symptoms, above seem's to fix ???? ( 
> strange ).

XFree86 touches they keyboard controller directly unless you rebuild it 
against a recent -ac kernel. This causes amusing problems with legacy free
PC's as well as the timing issue.

That might explain the other one