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    FromDmitry Torokhov <>
    SubjectRe: [2.6.6] Synaptics driver is 'jumpy'
    DateMon, 17 May 2004 01:42:41 -0500
    On Monday 17 May 2004 01:32 am, Jan De Luyck wrote:
    > On Sunday 16 May 2004 21:29, Dmitry Torokhov wrote:
    > > On Sunday 16 May 2004 02:06 pm, Jan De Luyck wrote:
    > > > On Sunday 16 May 2004 19:18, Dmitry Torokhov wrote:
    > > > > Hmm.. there was no changes to PS/2 processing between 2.6.5 and 2.6.6
    > > > > except for some Logitech tweaking, but it should not affect Synaptics
    > > > > handling in any way...
    > > > >
    > > > > Could you check if you still have DMA enabled on your disks, check your
    > > > > time source (TSC, ACPI PM timer, etc) and probably boot with acpi off?
    > > > >
    > > > > Thank you.
    > > >
    > > > Dmitry,
    > > >
    > > > Booting with acpi=off fixes the problem, although I'm curious to what the
    > > > problem actually is.
    > > >
    > > > I've attached the dmesgs from 2.6.6, 2.6.5, and 2.6.6 with acpi=off.
    > > >
    > > > There is a line that says "Invalid control registers" that I wonder where
    > > > it comes from, but you might see something more here than I do.
    > >
    > > It comes from speedstep-centrino module, could you please try booting with
    > > ACPI but without speedstep-centrino loaded? Also, does it help if you do
    > > not compile/ load ACPI battery module?
    > 
    > Neither has any effect.
    > 
    > I've also disabled CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI, figuring there might be
    > some problem with that, but that doesn't change a thing.
    >
    
    Perhaps we need to check with ACPI guys as it seems that you are affected by
    this code and there were some changes to ACPI subsystem between 2.6.5 and 2.6.6.
    
    > Also, I'm wondering if there's any point in using the CONFIG_X86_PM_TIMER
    > timesource?
    >
    
    It is supposed to be unaffected by frequency changes which is a good thing. I am
    running with it, but I think I've seen couple of reports that it caused time go
    twice as fast.
    
    -- 
    Dmitry
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