Quote from: kupan787 on May 01, 2016, 02:16:54 AM

Received mine a few weeks ago. Both have been running fine connected to a powered USB hub, humming along at 200 MHz with a fan. Yesterday I rebooted my raspberry pi, and now one of them won't seem to start hashing, no matter the frequency I specify. It just keeps cycling into failure. The other one is fine, and works with no issues.

Code:

cgminer version 4.9.2 - Started: [2016-04-30 19:09:20.472]
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(5s):0.000 (1m):0.000 (5m):0.000 (15m):0.000 (avg):0.000h/s
A:0 R:0 HW:0 WU:0.0/m
Connected to stratum.XXXXXX.XXX diff 1.02K with stratum as user XXXXXX
Block: 293f16aa... Diff:179G Started: [19:09:20.473] Best share: 0
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[U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
1: COMPAC 10002743: 150MHz | 0.000 / 0.000h/s WU:0.0/m
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[2016-04-30 19:09:17.980] Started cgminer 4.9.2
[2016-04-30 19:09:19.468] Probing for an alive pool
[2016-04-30 19:09:19.631] Pool 0 difficulty changed to 1024
[2016-04-30 19:09:20.473] Network diff set to 179G
[2016-04-30 19:09:31.166] COMPAC 0: No valid hashes for over 10 secs, attempting to reset
[2016-04-30 19:09:31.167] COMPAC 0 attempted reset got err:(0) LIBUSB_SUCCESS
[2016-04-30 19:10:31.154] COMPAC 0: Device failed to respond to restart
[2016-04-30 19:10:31.155] COMPAC 0 failure, disabling!
[2016-04-30 19:10:34.181] Hotplug: Gekko added COMPAC 1
[2016-04-30 19:10:45.116] COMPAC 1: No valid hashes for over 10 secs, attempting to reset
[2016-04-30 19:10:45.117] COMPAC 1 attempted reset got err:(0) LIBUSB_SUCCESS

I've tried changing the voltage, switching USB reports, and even plugging into a different device (OS X laptop), and this one just never gets going. The light is green, just not sure how to get it going again.

Any suggestions?

its your hub.. at 200M you are right at the .9A most hubs can put out..
try going down to 196.88