Carlos Corbacho <carlos <at> strangeworlds.co.uk> writes: > > [Adding tglx to CC as he knows more about HPET's than I] > > On Sunday 03 February 2008 18:33:57 f.cecco77 <at> tiscali.it wrote: > > Hello, > > I have a asus a6t with nforce4/MCP51 chipset. I pass to kernel 2.6.24 > > 32 bit the options acpi_use_timer_override and hpet=force, in this way > > and the timer IRQ ends up routed as IO-APIC-edge instead of XT-PIC. > > With acpi_use_timer_override I just get: > > > > TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 > > > > and it works through the IO-APIC. > > > > Instead the hpet is disabled and I just get : > > > > Time: acpi_pm clocksource has been installed. > > Clocksource tsc unstable (delta = -85010975 ns) > > > > Is possible to have hpet working also with if the BIOS doesn't support > > it ? > > One point before we start - MCP51 is nForce 5, not nForce 4 (which is CK804). > > If my understanding is correct, acpi_use_timer_override is only a workaround > required for those nForce 5 boards that don't enable the HPET for you. > > So IIUC, you should be able to use either 'hpet=force' > or 'acpi_use_timer_override', either of which should solve any timing issues > you see, but you shouldn't need both (which should solve your problem of > acpi_use_timer_override ignoring the HPET - it shouldn't be needed > if 'hpet=force' enables the HPET). > > -Carlos
Thanks for your answer. In my case only acpi_use_timer_override helps with timing issues, enabling apic. Unfortunately, either the options hpet=force or acpi_use_timer_override don't enable HPET on asus a6t. The situation is always the same: cecco:/home/cecco# grep Clock /proc/timer_list Clock Event Device: pit Clock Event Device: lapic Clock Event Device: lapic I don't understand because with Turion X2 or amd64 is so difficult to have hpet and dynticks working. Is important to have a cool notebook, but Amd doesn't seem to understand it. Amd has introduced C1e state for a good powersaving, saying it is equivalent to C3 state but I haven't any prove about this. Cecco -- 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/
