Connected USB devices cause coma when entering deep sleep
Connected USB devices cause coma when entering deep sleep
- Subject: Connected USB devices cause coma when entering deep sleep
- From: Michael Ellis <email@hidden>
- Date: Wed, 22 Sep 2004 16:29:20 -0400
Hi folks.
I'm interesting in troubleshooting the following problem, so I'm hoping
to get some advice as to which module I should look into (IOKit or the
Power Management System).
For the past few months, I have periodically encountered an issue when
the computer is entering deep sleep. The symptoms are:
1) The display goes dark
2) The power light DOES NOT pulsate as it would if the computer was
sleeping
3) The fans continue to run
4) The computer is unresponsive to remote login (ssh) and it will not
wake up when a keyboard or mouse event is generated
I suspected that it might be a problem with the PowerChute driver for
my APC UPS, so I've been running for a few weeks with the APC's USB
cable disconnected. During that time, I have not encountered the
issue, so I figured it was the APC software.
However, recently I added an EPSON RX500 Multifunction device (printer,
scanner, card reader) to the system. With this device attached, I
experience the sleep problem 100% of the time, whenever the system
attempts to enter deep sleep. This confirms that the problem is
related to USB, but it is not confined to the APC UPS as I had
previously thought. The repeatability of the failure with the EPSON
attached is more annoying, but at least it is predictable and that's
the first step in hunting down this sort of problem.
So the question remains: is this likely related to the system's USB
support, or is it related to the power management system?
I'd appreciate any thoughts.
-Mike Ellis
=========================
Michael F. Ellis
President
Ellis Softworks Inc.
----------
Phone: (941) 713-0361
Email: email@hidden
Web: http://www.ellissoftworks.com
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