Messages in this thread | | | Date | Fri, 23 Jan 2004 20:54:39 +0100 | From | Vojtech Pavlik <> | Subject | Re: keyboard and USB problems (Re: 2.6.2-rc1-mm2) |
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On Fri, Jan 23, 2004 at 11:27:41AM -0800, john stultz wrote: > On Fri, 2004-01-23 at 08:19, Vojtech Pavlik wrote: > > On Fri, Jan 23, 2004 at 05:01:52PM +0100, Rudo Thomas wrote: > > > BogoMIPS is figured out to be 8.19 (this was already reported by another user), > > > > ... this the root cause of the following problems. > > > > > and i8042.c complaints with this: > > > i8042.c: Can't write CTR while closing AUX. > > > > ... bogomips is used in udelay() and that's used for waiting. If > > bogomips is measured lower than real, the wait takes shorter and the > > hardware doesn't do what it should in that short time. > > Well, loops_per_jiffy is actually being measured correctly as we're > using the acpi pm timesource to time udelay(). However there is a loss > of resolution using the slower time source, so udelay(1) might take > longer then 1 us.
Longer udelay shouldn't cause trouble. Shorter one definitely would.
> If that is going to cause problems, then we'll need to pull out the > use-pmtmr-for-delay_pmtmr patch. I guess our only option is then to use > the TSC for delay_pmtrm() (as a loop based delay fails in other cases). > I'll write that up and send it your way, Andrew.
I've seen the PM timer breaking the mouse operation rather badly in the past, the lost-sync check was triggering for many people when the PM timer was used. This implies time inacurracy in the range of 0.5 seconds. Could that happen somehow?
-- Vojtech Pavlik SuSE Labs, SuSE CR - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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