Date: Wed, 04 Dec 2002 16:11:07 -0800 From: Darryl Okahata <darrylo@soco.agilent.com> To: "Cliff L. Biffle" <cbiffle@safety.net> Cc: freebsd-current@FreeBSD.ORG Subject: Re: USB issues with Apollo KT133A mobo Message-ID: <200212050011.QAA29605@mina.soco.agilent.com> In-Reply-To: Your message of "Wed, 04 Dec 2002 16:00:15 MST." <200212041600.15087.cbiffle@safety.net>
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"Cliff L. Biffle" <cbiffle@safety.net> wrote: > More specifically, all USB devices lose power. The device nodes stay in /dev > and there are no notices to dmesg about the loss until I unplug and replug > them, at which time it says 'port error: restarting port N' where N is > generally 0, depending on which controller it is. It then redetects my > hardware. 1. IIRC, USB ports on KT133A motherboards were buggy (???). 2. Drawing too much power from the USB ports can cause the ports to shut down. The absolute maximum limit is 500mA, which isn't much (some 2.5" USB hard disks can draw MUCH more, which violates the spec, and sometimes works, and sometimes doesn't). Here's another discussion on this: http://groups.google.com/groups?hl=en&lr=lang_en&ie=UTF-8&threadm=ajedc5%24bej%241%40paris.btinternet.com&rnum=1 -- Darryl Okahata darrylo@soco.agilent.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Agilent Technologies, or of the little green men that have been following him all day. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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