lkml.org 
[lkml]   [2008]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: hpet on nforce4/MCP51 in asus a6t
Date
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




\
 
 \ /
  Last update: 2008-02-04 19:13    [W:0.054 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site