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    Subjectlocal APIC may cause XFree86 hang
    Yesterday I installed a Radeon 8500 in a box. Suddenly the box
    consistently hung hard every time I tried to shut down XFree86.

    It turned out to be the local APIC timer: with it enabled,
    the hangs occur; with it disabled but with the rest of the
    local APIC and the performance counters in use, there are no
    problems at all.

    Does XFree86 (its core or particular drivers) use vm86() to
    invoke, possibly graphics card specific, BIOS code?
    That would explain the hangs I got. The fix would be to
    disable the local APIC around vm86()'s BIOS calls, just like
    we now disable it before APM suspend.

    Doesn't the PCI code also do BIOS calls?

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      Last update: 2005-03-22 13:31    [W:0.017 / U:23.516 seconds]
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