linux-kernel - Re: 2.6.25-rc5.git4 regression PS/2 mouse not detected/working

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Message-ID: <20080402113043.ZZRA012@mailhub.coreip.homeip.net>
Date:	Wed, 2 Apr 2008 11:33:28 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Balaji Rao <balajirrao@...il.com>
Cc:	Yanko Kaneti <yaneti@...lera.com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.25-rc5.git4 regression PS/2 mouse not detected/working

Hi Blaji,

On Wed, Apr 02, 2008 at 08:38:33PM +0530, Balaji Rao wrote:
> 
> Coincidentally even I hit upon this bug a couple of days ago after enabling 
> HPET in my BIOS. A quick check told me that IRQ 12 which the patch assigns to 
> the HPET device is used by the PS/2 mouse as well. This makes the mouse 
> inactive.
> 
> I am working on this.. I am not sure if the PS/2 code is misbehaving though..
>

Normally IRQ12 can not be shared on X86 if PS/2 mouse is present.
If PCI side tries to grab the IRQ then ISA (legacy) side will never
see its interrupts coming.

-- 
Dmitry
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