I've been using CgMiner 3.4.1 since late September. It can see my four USB Block Erupters, and works:
cgminer version 3.4.1 - Started: [2013-11-20 07:48:07]
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(5s):1.223G (avg):978.4Mh/s | A:18 R:0 HW:1 WU:17.4/m
ST: 2 SS: 0 NB: 1 LW: 37 GF: 0 RF: 0
Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
Block: 00070bedfe64cbc8... Diff:609M Started: [07:48:07] Best share: 124
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[P]ool management [S]ettings [D]isplay options [Q]uit
AMU 0: | 307.2M/327.5Mh/s | A:12 R:0 HW:0 WU:10.0/m
AMU 1: | 267.8M/314.6Mh/s | A: 0 R:0 HW:0 WU: 2.5/m
AMU 2: | 280.3M/322.7Mh/s | A: 6 R:0 HW:0 WU: 3.7/m
AMU 3: | 127.4M/308.9Mh/s | A: 3 R:0 HW:1 WU:10.5/m
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[2013-11-20 07:48:43] Accepted 1326b92d Diff 13/3 AMU 0
[2013-11-20 07:48:47] Accepted 3e086003 Diff 4/3 AMU 0
[2013-11-20 07:48:58] Accepted 487047eb Diff 3/3 AMU 3
But it regularly crashes with a stack overflow.
About a month ago i tried to upgrade to CgMiner 3.6, but it fails to find my USB devices:
cgminer version 3.6.0 - Started: [2013-11-20 07:49:52]
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(5s):0.000 (avg):0.000h/s | A:0 R:0 HW:0 WU:0.0/m
ST: 2 SS: 0 NB: 1 LW: 2 GF: 0 RF: 0
Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
Block: 00070bedfe64cbc8... Diff:609M Started: [07:49:52] Best share: 0
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[P]ool management [S]ettings [D]isplay options [Q]uit
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[2013-11-20 07:49:49] Started cgminer 3.6.0
[2013-11-20 07:49:49] Loaded configuration file cgminer.conf
[2013-11-20 07:49:51] No devices detected!
[2013-11-20 07:49:51] Waiting for USB hotplug devices or press q to quit
[2013-11-20 07:49:51] Probing for an alive pool
[2013-11-20 07:49:52] Pool 0 difficulty changed to 3
[2013-11-20 07:49:52] Network diff set to 609M
So i reverted to 3.4.1, living with the semi-daily crashes and having to remember to restart CgMiner. This morning i tested CgMiner 3.8, hoping they fixed its inability to see USB Block Eruptors (and the stack overflow). Unfortunately it still does not see USB devices:
cgminer version 3.8.0 - Started: [2013-11-20 07:44:46]
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(5s):0.000 (avg):0.000h/s | A:0 R:0 HW:0 WU:0.0/m
ST: 2 SS: 0 NB: 1 LW: 16 GF: 0 RF: 0
Connected to stratum.bitcoin.cz diff 1 with stratum as user joesmith
Block: 70bedfe6... Diff:609M Started: [07:44:46] Best share: 0
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[P]ool management [S]ettings [D]isplay options [Q]uit
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[2013-11-20 07:44:42] Started cgminer 3.8.0
[2013-11-20 07:44:42] Loaded configuration file cgminer.conf
[2013-11-20 07:44:44] AMU 0 SendWork usb write err:(-7) LIBUSB_ERROR_TIMEOUT
[2013-11-20 07:44:44] FAIL: USB get_lock not found (3:2)
[2013-11-20 07:44:44] FAIL: USB remove not already in use (3:2)
[2013-11-20 07:44:45] No devices detected!
[2013-11-20 07:44:45] Waiting for USB hotplug devices or press q to quit
[2013-11-20 07:44:45] Probing for an alive pool
[2013-11-20 07:44:46] Pool 0 difficulty changed to 3
[2013-11-20 07:44:46] Network diff set to 609M
[2013-11-20 07:45:14] Pool 0 difficulty changed to 1
[2013-11-20 07:45:14] Stratum from pool 0 requested work restart
[2013-11-20 07:45:14] Stratum from pool 0 requested work restart
So i am, once again, reverted to CgMiner 3.4.1.
What did they break after CgMiner 3.4, and how do i fix it?
WinUSB
Just to preempt people who might suggest it, rather than offering any insight, i re-ran zadiag 2.0.1.162 (Updated 11/20/2013), and "reinstalled" the WinUSB driver for my for USB devices (and rebooted)
No effect.
What is CgMiner 2.8 doing wrong that CgMiner 2.4 did right?
Edit: Using Silicon Labs own VCP (Virtual COM Port driver):
gives the error (in BfgMiner):
usb_devinfo_scan: Error opening device: LIBUSB_ERROR_NOT_SUPPORTED
In CgMiner it gives:
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 1:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:6
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:8
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:10
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:11
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:12
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:13
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 6:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:1
So i've changed it trying every driver with some of the miners. Three are using the libusb-win32 driver, three are using the libusbx.org driver, and the rest are using the Silicon Labs CP210x USB to UART Bridge driver:
Both CgMiner and BfgMiner detect no devices.
