On Mon, 09 Aug 2010 18:13:49 +0100 Barry Samuels <ba...@beenthere.mail1.co.uk> wrote:
> On 09/08/10 17:41:28, Celejar wrote: > > On Fri, 06 Aug 2010 14:02:11 +0100 > > Barry Samuels <ba...@beenthere.mail1.co.uk> wrote: > > > > > Desktop and Laptop both have Debian Testing installed and up to date; > > > both with self-compiled kernel 2.6.32. > > > > > > I have a CurrentCost electricity usage monitor which is normally > > > connected to my desktop via USB and is working properly. When the unit > > > is plugged in I get a number of lines in syslog like so: > > > > > > kernel: usb 4-1: new full speed USB device using uhci_hcd and address > > > 12 > > > kernel: pl2303 4-1:1.0: pl2303 converter detected > > > kernel: usb 4-1: pl2303 converter now attached to ttyUSB0 > > > > > > I am trying to get this same device working on my laptop but this time > > > I see the following in syslog: > > > > > > kernel: pl2303: Prolific PL2303 USB to serial adaptor driver > > > > > > but nothing else i.e no 'attached to ttyUSB0'. Looking in /dev there > > > is no ttyUSBn > > > > > > Whereas the desktop also loads the pl2303 and usbserial kernel modules > > > automatically when the device is connected the laptop does not and > > > when I load them manually I get only the above mentioned line in > > > syslog. > > > > > > When the USB device is plugged in there is apparently no reaction from > > > the operating system on the laptop when watching /var/syslog using > > > 'tail'. That, I think, is the main problem. Other USB devices on the > > > laptop do work. > > > > > > Needless to say the software which monitors the device won't connect. > > > > > > Any suggestions please? > > > > Are you using the *exact* same kernel on both systems? > > No of course not. One's a desktop the other's a laptop and they both have > different requirements e.g. different graphics drivers. The point is that you may have configured something crucial differently on the two. > > Do you have the same problem with a Debian stock kernel? The first > > step when debugging problems with self-compiled kernels is always to > > check if the problem exists with stock kernels, or only with one's own. > > I haven't tried a stock kernel but I have, since, tried a Knoppix Live DVD > in the laptop and it doesn't work with that either. No reaction from the > OS when the device is plugged in. I don't know if Knoppix uses a stock > kernel. I assume that it does use a "kitchen sink" kernel, so I'll admit bafflement as to why it's not picking up the device. Celejar -- foffl.sourceforge.net - Feeds OFFLine, an offline RSS/Atom aggregator mailmin.sourceforge.net - remote access via secure (OpenPGP) email ssuds.sourceforge.net - A Simple Sudoku Solver and Generator -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100809134319.749a782c.cele...@gmail.com
