Reasoning backward (using a kernel without the pinctrl_amd driver to > ensure xen only is at stake) : > checking the diff in IOAPIC between bare metal and xen (IRQ7 is on > pin07 on APIC ) > > using kernel argument : apic=debug > > bare metal : > [ 0.715330] fedora kernel: ... APIC VERSION: 81050010 > ... > [ 0.715433] fedora kernel: pin07, disabled, edge , high, V(00), > IRR(0), S(0), physical, D(0000), M(0) > > xen : > [ 2.249582] fedora kernel: ... APIC VERSION: 00000014 > ... > [ 2.249730] fedora kernel: pin07, disabled, level, low , V(60), > IRR(0), S(0), physical, D(0000), M(0) > > So the APIC table is not the same. > > As strange as it looks the (IOAPIC 0) pin07 is correctly described by the > APIC in xen but yet differently than in baremetal. > But the APIC message comes long after the > [ 1.833145] fedora kernel: xen: registering gsi 7 triggering 0 polarity > 1 > > so I wonder if the APIC pin07 info had any influence. > > Finally found the fix : adding ioapic_ack=new to xen boot parameters. Not only the trackpad is now working but also the ACPI Embedded Controller which is completely disabled.
Sébastien
