Date: Fri, 09 Apr 2010 15:54:00 -0500 From: Programmer In Training <pit@joseph-a-nagy-jr.us> To: freebsd-questions@freebsd.org Subject: Re: USB Powered Speakers Message-ID: <4BBF93E8.4080908@joseph-a-nagy-jr.us> In-Reply-To: <alpine.BSF.2.00.1004091403520.48629@wonkity.com> References: <4BBE8DB1.8040905@joseph-a-nagy-jr.us> <i2t75107331004081934n2745bc80s827568d06743a9a@mail.gmail.com> <4BBE9470.1040607@joseph-a-nagy-jr.us> <u2r283c23cd1004082121ye23254a4v3286d9636ee88526@mail.gmail.com> <l2q283c23cd1004082123v2d9ca5f1h8561ff3ad41cd5fb@mail.gmail.com> <4BBEB5BC.3000509@joseph-a-nagy-jr.us> <4bbedc81.G0j71lonOCUqR/vZ%perryh@pluto.rain.com> <alpine.BSF.2.00.1004090518480.42950@wonkity.com> <4BBF2674.6080402@joseph-a-nagy-jr.us> <s2k283c23cd1004090815ga305418ahde3ba53621e4c29@mail.gmail.com> <4BBF727D.6000407@joseph-a-nagy-jr.us> <alpine.BSF.2.00.1004091403520.48629@wonkity.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigAC513DEA68A7F0FAFF98BC08 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 04/09/10 15:24, Warren Block wrote: > On Fri, 9 Apr 2010, Programmer In Training wrote: >=20 >> On 04/09/10 10:15, Brodey Dover wrote: >>> "Apr 8 22:30:16 heaven kernel: usb_alloc_device:1624: getting device= >>> descriptor at addr 3 failed, USB_ERR_IOERROR!" >>> >>> exactly! That is what is causing the issues. From what I can see, it >>> is like it was explained before. The OS has chosen to play nice and >>> request that the speakers are disabled. >>> >>> The power requirements will not affect the system until the speakers >>> are producing sound. In other words, the system will only draw UP to >>> the power input rating while in operation. At idle, I'd wager they ma= y >>> only use 1/10 of its power rating for the idle ICs and a power LED. >=20 > Just to add: >=20 > When you plug in a USB device, it is a "low power" device (single unit > load, 100 mA) by default. >=20 > If that device wants to draw more power, it has to request high power (= 5 > unit loads) from the hub. The hub can provide that power, or shut down= > the port. I never knew that about USB ports. >> Only it's not the speakers that have their operation interrupted, JUST= >> the keyboard (not even the mouse is affected). >=20 > Guesses: >=20 > Total power budget (but FIFO?). I don't get that. Do you mean total power allocated to USB? > Speaker/keyboard USB ports are on the same internal hub. I'm not sure what you mean here. I've put the speakers on the internal, builtin USB ports (1.x) and they work fine except keyboard starts flaking out. I put them on the USB expansion card (which mouse and keyboard are on because they were starting to flake out on the builtins) with the same exact behavior. > High-power OLED keyboard (my eyes!). Keyboard label (if it is to be believed) is +5V 100mA. It's just a standard keyboard with some extra multimedia keys that aren't active (a pity, too). > Speakers labelled 500 mA but really only a low-power USB device. Than they shouldn't be messing with the keyboard, right? It usually takes about an hour or so for the keyboard to settle down to a usable state (until then, I'm doing a lot of mousing as the keyboard is near useless). I really don't know where to look for this. I've never even heard of USB powered speakers until I got these (no, I don't pay much attention to what's available unless I have a great need for it). I'm thinking I'm just going to wait until Tuesday and get a brand new pair of wall-powered speakers. This hassle is NOT worth it (they put out decent sound). --=20 Yours In Christ, PIT Emails are not formal business letters, whatever businesses may want. Original content copyright under the OWL http://owl.apotheon.org Please do not CC me. If I'm posting to a list it is because I am subscrib= ed. --------------enigAC513DEA68A7F0FAFF98BC08 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iQEcBAEBAgAGBQJLv5PvAAoJEENZQ8DH7rW0O0QH/3iZ7HVO+uTdwOOREpwoM2Dp iOezIHcatwYEis8/XgQ3risOyThqKuAycsuROoUPg4WpW06K8V+bSBqGiK3JWLfs k5GJPOgsvAtn8QpIRGGil4CYT/V4GavdZR2oKqlPERnfU6oD9LyL7WgpG6RZonHk JaLhJ2oWxrQ1eBAOgjMlWwYneJsBV2MIguNRpQyw5py8pxtokakmcsqGqyJjrT2l qF6rZhbBaxCXmKSeRnXXMgglV5Pt52BVzyrJZWeU9KB6j1DDooav2d7AoP7KtOn2 JdPSvLfYbrIiygT2BUE6rBHfYAefPZYT1AiV/Lm/6y5hbsVOSq2lfBajG2s1w8Q= =Tcss -----END PGP SIGNATURE----- --------------enigAC513DEA68A7F0FAFF98BC08--
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