[haiku-bugs] Re: [Haiku] #7520: USB mouse can't work when IO-APIC is enabled
- From: "mmlr" <trac@xxxxxxxxxxxx>
- Date: Fri, 20 May 2011 01:32:54 -0000
#7520: USB mouse can't work when IO-APIC is enabled
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Reporter: mt | Owner: mmlr
Type: bug | Status: assigned
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: x86
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Comment (by mmlr):
Looks like the missing Matrox card match could very well be the problem
here. The matrox driver will actually install an interrupt handler and
enable interrupts. But since it thinks it's on the (unmatched, still BIOS
assigned) interrupt line 11, it doesn't get anything there. On the other
hand it actually is mapped to interrupt line 16 on the IO-APIC, together
with two PCIe ports, a PCI brige, the MEI controller and the one EHCI
controller. The EHCI controller is the only one that actually has a
handler installed at 16. The interrupt code now sees lots of unhandled
interrupts on 16 because the matrox driver enabled them, but attached the
interrupt handler to the wrong vector 11 (not knowing any better due to
the missing match of the PCI routing table). Since there is only one
handler installed for vector 16 (EHCI) the interrupt code now concludes
that it is a non-shared vector where the handler is defunct and simply
disables the interrupt vector alltogether (this is printed to the syslog,
line 2066 in the attached one: {{{Disabling unhandled io interrupt 16}}}).
The legitimate EHCI interrupts now don't go through anymore and the
devices attached to the ports handled by that controller fail...
If you can, please still provide the "ints" KDL output, to verify that my
theory is at work at all. Please also try running Haiku in failsafe video
mode so the matrox driver isn't used. That should then result in the
interrupt not being disabled and USB devices should continue to work.
--
Ticket URL: <http://dev.haiku-os.org/ticket/7520#comment:9>
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