On Thu, 5 Jul 2007, Gene Heskett wrote: > >Does the case use external power or does it run off USB bus power? If > >it is bus-powered, perhaps it isn't getting enough juice. > > From the looks of the rear of the case, it could use a wall wart, there is a > plugin that says 5 [EMAIL PROTECTED] amps next to it, but it didn't come with > one. > > When on the lappy, it spins up and works just fine with only one of the dual > connector cables plugged in. The led in the front of the case is just as > bright when plugged into a port on this box as it is when plugged into the > lappy, hence my reticence to blame the power gods.
Don't be so sure. The laptop and the hub most certainly do not provide equivalent amounts of power. Furthermore, spinning up a disk takes more power than turning on an LED. > Since its only a 4 wire connection, I'm not sure how it could effect a > non-spinup and still have a nice bright white led which blinks when theres > traffic. As a C.E.T. and electron chaser for at least 55 years now, that > doesn't grok, so it stands to reason there may be some sort of an enabling > command sent from the lappy that is not being sent when its plugged into this > box due to a missing module. This is 2.6.22-rc7-cfs-v18, whereas the lappy > is running a stock, fairly recent FC5 issued kernel. > > Or at least that's the current theory. > > >Try turning on CONFIG_USB_STORAGE_DEBUG and see what shows up in the > >debugging log. > > Done, and the build is underway, or maybe even finished. Yup, done, so I'll > save this and reboot, brb. > > Humm, interesting, when I rebooted it was still plugged into the front panel > hub, a 1.1 hub. And it would not complete the bus scan in post! I tried to > get its attention from the keyboard via the usual vulcan nerve pinch etc, > finally got up and walked around to unplug it. I was going to hit the reset > button, but the floppies started seeking the instant I unplugged it and > before I could hit the button and the post completed normally. > > Now, to plug it in after unplugging something else and tail the log. > > It still takes about 1 minute to give up, and the log is no more verbose than > it was. I asked for the debugging log. You're looking at the regular system log, and your /etc/syslog.conf is undoubtedly set up to throw away debugging messages. You need either to change the syslog configuration or (the preferred method) to use the output from dmesg instead of the system log file. The dmesg method is preferred because, although the buffer size is limited, it will faithfully report all the kernel messages -- whereas syslogd is prone to miss some messages at times of heavy use. > Any other ideas other than lack of power? Its plugged into an Alps 7 port > USB2.0 hub, which is itself powered from the USB cable plugged into a 2.0 > port on the rear of the mobo, and everything else plugged into it is working > with no obvious problems. Do you realize that a bus-powered hub is prohibited by the USB spec from supplying power to more than 4 downstream devices? Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
