Re: panic from July 21 kernel (acpi related?)

On Jul 29, "Doug White" wrote:

> On Thu, 29 Jul 2004, Mike Hunter wrote:
> 
> > > Is the mouse plugged into the keyboard or into the laptop directly?
> > >
> > > Sounds power related, like the USB ports can't handle the load and its
> > > causing supply problems.
> >
> > Looks like you were right (nice catch)!  If I boot my laptop with my
> > logitech USB mouse (ums0: Logitech USB-PS/2 Optical Mouse, rev 2.00/11.10,
> > addr 2, iclass 3/1 ums0: 3 buttons and Z dir.) it seems to crash with or
> > without AC power hooked up.  But I know for sure it's crashed with no
> > mouse hooked up.  And I also know for sure that it doesn't crash if I have
> > the mouse *and* a USB keyboard hooked up.
> >
> > Thanks again for the suggestion...anything I can do to fix this?
> 
> How many USB ports does your laptop have?

It has three USB 2.0-compliant connectors and one D/Bay external media bay
connector.

> If it has 2, try plugging each into the machine directly.

I don't know what you mean by this.  When I've run with the external
keyboard and mouse, I do plug in directly (I don't have a docking
station.)

> If that still crashes, you may have to use a
> powered USB hub to drive both devices.. or find more power efficient USB
> devices :)
> 
> If your laptop can't provide full load to the USB port there isn't much
> you can do directly since its a design problem with the board.  It doesn't
> seem like an underperforming battery or p/s since it affects both modes.

I don't believe it's truly a power problem, because it works fine under
windows XP and knoppix linux.  I've never had it crash when plugging in a
USB device, and this crash seems to happen right before it wants to give
me the login prompt, so it seems like if it were truly a power issue I'd
have problems in these circumstances.

Let me know if there's any more info I can provide.

Thanks,

Mike