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Date: Wed, 2 Apr 2008 11:33:28 -0400
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Balaji Rao <balajirrao@gmail.com>
Cc: Yanko Kaneti <yaneti@declera.com>, linux-input@vger.kernel.org,
       linux-kernel@vger.kernel.org, mingo@elte.hu,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 2.6.25-rc5.git4 regression PS/2 mouse not detected/working
Message-ID: <20080402113043.ZZRA012@mailhub.coreip.homeip.net>
References: <1205775229.25146.11.camel@indigo.declera.com> <1207091851.3306.6.camel@d2> <20080402105253.ZZRA012@mailhub.coreip.homeip.net> <200804022038.33245.balajirrao@gmail.com>
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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