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

[Dmitry Torokhov]

On Wed, Apr 02, 2008 at 11:00:13PM +0530, Balaji Rao wrote:
> On Wednesday 02 April 2008 09:03:28 pm Dmitry Torokhov wrote:
> > 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.
> > 
> OK. So, I need to specifically check for IRQ12 being assigned and avoid it ?
> 

Yeah.. I think there are other legacy IRQs that should be avoided as well.
I am pretty sure Ingo would have a better idea which they are.

-- 
Dmitry
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