On 3/17/10 12:29 PM, Ambrogio wrote: > Il giorno mer, 17/03/2010 alle 12.58 +0100, NoSpaze ha scritto: > > >> I cant' understand if you are able to charge also from the wall power >> adapter. Anyway, it doesn't seem to be a linux issue; could be: >> > I also think it's not a Linux issue, because I'm unable to charge them > with a wall power adapter. > The wall adapter was sold by the same vendor, saying that it's good > enough for all devices ;-) > > >> - Cable damaged >> > I used different cables, starting from the 2 embedded with the devices. > > >> - Charging from PC is not possible on both devices (if they are chinese, >> I can bet on it). >> > They are sold with the specific feature. It can be charged only with USB > adapter. > > >> - USB card damaged >> > I tried with 2 different PC, with every USB port. > The port seams to works very well with a lot of periferals (also USB HD > without power). > > >> - MP3 devices require some software signal to start charge (look for >> software) >> > One of them is sold with a CD, but the software is only for upload new > firmware and is only for windows (not vista). > The other is sold without software. > > >> - Some BIOS options on the devices can able the USB port to >> enable/disable charging when mounted (just try unmounting and wait or >> looking for configuratio options on devices). >> > One of them has only 5 keys, no display, nothing that suggest special > functions. > > Now I don't have anymore the devices, so I can consider closed the > issue. > My children will remain without mp3 player for now :-D > > But this is a very strange quirk. > It really isn't. By default, the USB libraries leave the USB ports in low power mode. Many devices (e.g. Blackberrys) require more power than that. In the case of a Blackberry, the barry libraries and udev rulesets kick the USB port into high-power mode to charge it. Is there a way to force high power to all USB ports...not that I know of. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
