On Fri, 16 Nov 2007, Oliver Neukum wrote: > > > On irq 20, there's an UHCI, on irq 19 is an EHCI. For every interrupt on > > > 20 > > > there's a spurious interrupt on 19. USB devices on bus of the controller > > > on 20 > > > work. So I know all interrupts are seen. ERR does not increase. Interrupts > > > for devices on the bus of the controller on 19 arrive at 19 only. > > > > I suggest you try to sort it out with the maintainers of the UHCI and > > EHCI drivers then. > > They are innocent. This laptop really delivers an interrupt twice.
Perhaps, but these drivers are involved and the device-specific knowledge will help tracking down the cause. I have general experience on how interrupts work, including on APIC-based systems, but I have no idea how UHCI and EHCI devices work in this area and, in particular, how you know an interrupt coming from the line #19 is related to one on the line #20 and then a spurious one if not recorded as ERR or otherwise unclaimed (which would be reported as "irq 19: nobody cared"). Maciej - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
