I have the same question open in a Mining help thread here but thought I'd ask you guys who are most knowledgable with cgminer.
Running cgminer 4.10.0 on a Raspberry Pi 3, which is connected to an Avalon AUC3, which is connected to an Avalon 741 ASIC miner. When I start cgminer, I get the following response:
root@OpenWrt:/lib/modules/4.4.14# cgminer -o us-east.stratum.slushpool.com:3333 -O userid.shop100:x -D --verbose
[2016-12-14 02:10:04.665] Started cgminer 4.10.0
[2016-12-14 02:10:04.665] RES: thread starting
[2016-12-14 02:10:04.665] USB scan devices: checking for AV7 devices
[2016-12-14 02:10:04.832] AV7 looking for AV7 29f1:33f2 but found 0424:ec00 instead
[2016-12-14 02:10:04.832] AV7 looking for AV7 29f1:33f2 but found 0424:9514 instead
[2016-12-14 02:10:04.832] AV7 looking for AV7 29f1:33f2 but found 1d6b:0002 instead
[2016-12-14 02:10:04.832] No devices detected!
[2016-12-14 02:10:04.832] Waiting for USB hotplug devices or press q to quit
[2016-12-14 02:10:04.832] Probing for an alive pool
[2016-12-14 02:10:04.832] Testing pool stratum+tcp://us-east.stratum.slushpool.com:3333
[2016-12-14 02:10:04.921] Succeeded delayed connect
[2016-12-14 02:10:05.219] Pool 0 stratum session id: 1
[2016-12-14 02:10:05.220] Pool 0 difficulty changed to 2048
[2016-12-14 02:10:05.221] Pool 0 coinbase 01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff4503f27307fabe6d6d14260e5f1745bbbfd4edaa7f0a102fcfb8ac5ece9a3399e6c37e8f6586741cb80100000000000000036501004fb5f2000000003245072f736c7573682f00000000022b8c185
[2016-12-14 02:10:05.326] Stratum authorisation success for pool 0
[2016-12-14 02:10:05.326] Pool 0 stratum+tcp://us-east.stratum.slushpool.com:3333 alive
[2016-12-14 02:10:05.832] Unable to set thread to low priority
[2016-12-14 02:10:05.832] Unable to set thread to high priority
[2016-12-14 02:10:05.832] Testing pool stratum+tcp://us-east.stratum.slushpool.com:3333
[2016-12-14 02:10:05.833] Unable to set thread to low priority
[2016-12-14 02:10:05.833] Work update message received
[2016-12-14 02:10:05.833] Unable to set thread to low priority
Assuming the plugged in hardware is functioning correctly, what could be causing these messages:
[2016-12-14 02:10:04.832] No devices detected!
[2016-12-14 02:10:04.832] Waiting for USB hotplug devices or press q to quit
Are there downloadable USB drivers for the Raspberry Pi 3? Anyone else ever have this issue and successfully resolve it?
Thanks