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    SubjectRe: keyboard and USB problems (Re: 2.6.2-rc1-mm2)
    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
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