Hello everybody, I have a similar problem with an external drive. The drive gets its main power via a power supply, but unfortunately the usb controller on the external drive gets its power via USB. I have a dual boot system and the drive works fine from windows, but form linux, it does not get enough power (as it appears to me).
Yes, there coould be a switch to tell the host USB controller to supply more current (not voltage). I personally would think that such a switch is stupid, unlees it is a powersaving mode. That is, if linux driver sets the host controller output power to power save mode or something like that. It does not set the controller to the powersave mode, just the power output of the contoller. As I said, It makes no sence to me and I do not see how this could be a linux problem, but it appears to me that it is. :-) With best wishes, Lazar --- Alan Stern <[EMAIL PROTECTED]> wrote: > 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 > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------- 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
