psm0: unable to allocate irq

Mauro Medda medda.mauro at
Thu Feb 5 16:53:42 UTC 2015

I solved!

The problem was related to ACPI DSDT.
In dell 5748 BIOS puts keyboard resources on the PS/2 mouse port.
I fixed the problem with a  DSDT table dump and a simple patch that
moves I/O port, 0x66, for PS2M (the mouse) out of keyboard CSR.

After that, I compiled a new AML code for the DSDT and loaded them using
the boot loader vars below:


If someone is interested in patch and/or my AML DSDT send me an e-mail.

Who should I contact for develop something more useful and
versatile like as atkbd, pcs and apci kernel modules patches?


	-- Mauro

Il 04/02/2015 11:35, Mauro Medda ha scritto:
> Hi *,
> I installed FreeBSD 10.1 on my new DELL Inspiron 17 5000 series and
> I discovered that the touchpad doesn't work.
> Booting FreeBSD in verbose mode appears the message that I indicated
> in this e-mail subject: psm0: unable to allocate irq.
> Reading the source file /usr/src/sys/dev/atkbdc/psm.c I found that
> this message is displayed when irq is not available.
> Any ideas?
> Thanks in advance,
> kind regards
> 	-- Mauro

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