Lee Dowling wrote:
This, of course, doesn't deal with outside cases.
It's common knowledge that a lot of equipment is running out of spec all
the time because of cheap components, bad BIOS's etc. As an example, my
Asus L4500R laptop (with the latest ASUS BIOS) ALWAYS shows
"over-current" under Linux on all *internal* USB ports the second
ANYTHING is plugged in (and I have nearly 50 different USB devices of
different types, manufacturers and quality).
The suggestion to simply stop over-current ports from working would
immediately disable all USB ports, including any powered hubs that I
plug into them, I assume. I can't update the BIOS any further to stop
this and if I could I doubt it would solve the problem (it looks like
cheap hardware to me). Therefore, you've just removed all my perfectly
functional USB capability because the best BIOS I can use reports an
incorrect error (hey, what's new?).
I don't think you assume correctly. Overcurrent indication from the hub
is supposed to mean that something on the hub is shorted or pulling too
much current. This discussion is about the kernel refusing to enable
devices when they would consume more power than the hub they are
connected to can provide. Regardless of what you do with plugging in
devices, overcurrent isn't supposed to happen unless something is broken.
Windows XP, incidentally, runs flawlessly with all USB devices without
power warnings on this laptop. This may well be fixable somewhere else,
it may even be a bug in the internal USB code for my laptop which may be
help in hunting such bugs down.
Probably either XP ignores the overcurrent indication, or else something
in Linux is interacting badly with the controller and causing this
indication. XP definitely DOES enforce USB power budgeting.
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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