On Mon, 16 Jan 2006, Warren wrote: > Then what would you suggest? I have no idea - I am not a hardware guy. > The symptoms are obvious and easily reproducible. The charging works > every time in Windows and fails every time in Linux.
I have no suggestions. Maybe Dave can come up with something; he knows about more kinds of USB hardware than I do. Alan Stern > Alan Stern wrote: > > On Sat, 14 Jan 2006, Warren wrote: > > > > > >> It is not an overcurrent condition. In 2 cases the machines are > >> dual-boot. In both cases, EVERY time the machines are booted into > >> Windows the BlackBerry and ipod charge just fine and EVERY time they are > >> booted into Linux they do not. It definitely is a Windows vs Linux > >> issue. This has been going on for over a year (with the BB) on machines > >> at home and in several offices. > >> > >> It makes no difference if I am talking about Dell workstations and > >> laptops, Asus boards (32 and 64 bit), VIA EPIA boards and some other > >> manufacturers as well. I have confirmed this on at least a dozen > >> different types of hardware from different manufacturers. I have had at > >> least 3 blackberries and an ipod all exhibit these symptoms when plugged > >> in. > >> > >> I suspect that there is a register in the USB port's hardware that tells > >> it how much voltage to supply and that Linux sets it to a different > >> number than Windows. It is not a matter of having the power turn off, > >> because the blackberry does eventually charge, but at a much slower > >> rate, and I get a message from the BlackBerry saying that the USB port > >> is not supplying enough power to charge it. > >> > > > > I've never heard of such a register, and nothing like it is listed in the > > UHCI specification. > > > > Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
