* Len Brown <lenb@xxxxxxxxxx> wrote: > From: Len Brown <len.brown@xxxxxxxxx> > > Linux tells ICH4 users that they can (manually) invoke > "hpet=force" to enable the undocumented ICH-4M HPET. > The HPET becomes available for both clocksource and clockevents. > > But as of ff69f2bba67bd45514923aaedbf40fe351787c59 > (acpi: fix of pmtimer overflow that make Cx states time incorrect) > the HPET may be used via clocksource for idle accounting, and > hpet=force on an ICH4 box hangs boot. > > It turns out that touching the MMIO HPET withing > the ARB_DIS part of C3 will hang the hardware. > > The fix is to simply move the timer access outside > the ARB_DIS region. This is a no-op on modern hardware > because ARB_DIS is no longer used. > > http://bugzilla.kernel.org/show_bug.cgi?id=13087 Nice fix! This moots the other half-quirk patch you wrote for hpet, right? Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
