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    SubjectRe: keyboard and USB problems (Re: 2.6.2-rc1-mm2)
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    On Fri, 2004-01-23 at 11:54, Vojtech Pavlik wrote:
    > On Fri, Jan 23, 2004 at 11:27:41AM -0800, john stultz wrote:
    > > 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.

    Hmm.

    > > 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?

    Not in a way that I yet understand. Do you see similar problems with
    folks using clock=pit?

    thanks
    -john


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