On Friday 25 July 2014 07:50:25 Ed Nisley did opine And Gene did reply: > On 07/24/2014 09:06 PM, Gene Heskett wrote: > > the real problem that caused the usb disconnect? > > If the dmesg dump says something like: > hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... > Its not saying exactly that Ed. Jul 24 20:30:04 shop kernel: [ 762.082869] usb 1-6: USB disconnect, address 3 Jul 24 20:30:04 shop kernel: [ 762.340067] usb 1-6: new high speed USB device using ehci_hcd and address 4 Jul 24 20:30:05 shop kernel: [ 762.800062] usb 4-2: new full speed USB device using uhci_hcd and address 3 Jul 24 20:30:05 shop kernel: [ 763.360812] usb 4-2: not running at top speed; connect to a high speed hub Jul 24 20:30:05 shop kernel: [ 763.450170] usb 4-2: configuration #1 chosen from 1 choice Jul 24 20:30:05 shop kernel: [ 763.459947] uvcvideo: Found UVC 1.00 device USB 2.0 PC Camera (058f:5608) Jul 24 20:30:06 shop kernel: [ 763.465178] input: USB 2.0 PC Camera as /devices/pci0000:00/0000:00:1d.2/usb4/4-2/4-2:1.0/input/input7
I will move it to a rear panel usb socket just for S&G. Currently plugged into a front panel socket, which may or may not be clean enough for a high speed connection. The FP socket may not be as directly grounded as a rear panel socket could be. The front panel is of course a plastic casting so any ground is 8" of breakout cable away on the rear of the motherboard. The camera itself is grounded thru its alignment adjusting screws, to the frame of the machine. It also is grounded, but likely not well enough. All food for thought, and inspection with my 100mhz dual trace scope. I do recall having to put both a capacitor, and a small debounce (3 base_thread intervals IIRC) in the "probe" facility on it. > Then I'll lay you long odds it really *is* EMI from your myriad > steppers and suchlike. Spent quite a while figuring that out, but in > my case it was an acrylic jacket: > > http://softsolder.com/2009/01/28/usb-disconnects-nobody-moves-nobody-ge > ts-hurt/ Sounds like you need a heat leak into the basement, and a humidifier installed in the furnace. I have both in the house, but only electric heat in the shop and wall fans, for overtemps where all this is taking place even when its pouring it out of one of those famous boots. :) That high humidity failure points to EMI also. > Now, if that's not what dmesg says, I'd still suspect EMI... Thanks Ed. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
