On Thu, 3 Feb 2022, Brent Spillner wrote: > > If your system has ACPI, I think "pci=biosirq" and "acpi=noirq" are at > > best distractions from finding the real problem. > > ...except when the cause is indeed buggy ACPI firmware, which is > presumably the only reason these options exist in the first place. The former is really for us missing a PIRQ router or for a BIOS missing a $PIR table. I have been posting patches recently to add support for some of such systems identified. Those are all pre-ACPI, possibly long before, i.e. early to late 1990s (486 and P5/P54C Pentium and similar systems), and I think the option was added before we had ACPI support too. I have a couple of pre-ACPI x86 systems too, which are quirky to say the least even though they were the quality systems of the time from reputable vendors. FWIW, Maciej
