Hi, I run Ubuntu 12.04, with the Ubuntu version of owfs, 2.8p13 lsmod does not show ehci etc. I guess this means usb is not complied as modules in ubuntu??
Is there an equivalent to rmmod, modprobe in that case? I have had no success with e.g. sudo echo suspend > /sys/bus/usb/devices/4-1/power/level The system says "no access". Do I do it the wrong way? I have however read the LinkUSB manual, and I find that I can access the hanging unit (on my remote system) by finding the right baud rate (19200 is an example): sudo screen /dev/ttyUSB0 19200 I can list sensors on the bus, and I can change the baudrate to 38400 or 57600 and back to 19200 by the LinkUSB commands, and then reconnect with the new baud rate But I can't figure out how the reset the baud rate to 9600 (which I suspect could solve the problem?) Can the explanation for the problem be that after an unplanned shutdown the baudrate is at a non-default value, and owserver is unable to figure that out? I am able to reproduce all this with my home system; briefly cutting mains leaves owserver nonresponding, and I have to unplug/replug the LinkUSB. For this system I can also interact with the LinkUSB (before unplugging) by finding the right baud rate. Arne On 09.12.2013 23:15, Jan Kandziora wrote: > Am 09.12.2013 22:11, schrieb Arne Raaen: >> The problem arose (probably) at a brief power failure, i.e. an abrupt >> shutdown followed by restart once power returned. >> > Ok, given all the other suggestions this should mean the FTDI or LINKs > hardware is failing. > > Anyway, try rmmoding the hcd modules. That way the USB is de-powered as > long the board supports controlling the USB power by software. You can > also try with > > /sys/bus/usb/devices/*/power/level > > to change the power line for each port separately. But some boards have > USB-power hard-wired to +5V_STB, obviously that won't work with these > boards. In that unlucky case you can use an intermediate hub and control > this hub's power lines. That said: BEWARE FOR CRAPPY USB HUBS! Most of > them are. Find a decent one or you'll get even more problems. > > > Kind regards > > Jan > > ------------------------------------------------------------------------------ > Sponsored by Intel(R) XDK > Develop, test and display web and hybrid apps with a single code base. > Download it for free now! > http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
