CGMiner no output (LTC GPU mining)

Question

Here is my run command:

cgminer -o stratum+tcp://coinotron.com:3334 -u user -p pass --scrypt

the only output in my terminal I get is (and only this):

[2013-11-30 11:34:02] Started cgminer 3.7.2

if Ctrl+C it I finally get this output:

[2013-11-30 11:34:43] Summary of runtime statistics:
[2013-11-30 11:34:43] Started at [2013-11-30 11:34:03]
[2013-11-30 11:34:43] Pool: stratum+tcp://coinotron.com:3334
[2013-11-30 11:34:43] Runtime: 0 hrs : 0 mins : 40 secs                     
[2013-11-30 11:34:43] Average hashrate: 0.0 Kilohash/s                
[2013-11-30 11:34:43] Solved blocks: 0                     
[2013-11-30 11:34:43] Best share difficulty: 0                     
[2013-11-30 11:34:43] Share submissions: 0                     
[2013-11-30 11:34:43] Accepted shares: 0                     
[2013-11-30 11:34:43] Rejected shares: 0                     
[2013-11-30 11:34:43] Accepted difficulty shares: 0                   
[2013-11-30 11:34:43] Rejected difficulty shares: 0                   
[2013-11-30 11:34:43] Hardware errors: 0                     
[2013-11-30 11:34:43] Utility (accepted shares / min): 0.00/min       
[2013-11-30 11:34:43] Work Utility (diff1 shares solved / min): 0.00/min
[2013-11-30 11:34:43] Stale submissions discarded due to new blocks: 0
[2013-11-30 11:34:43] Unable to get work from server occasions: 0                 
[2013-11-30 11:34:43] Work items generated locally: 1                 
[2013-11-30 11:34:43] Submitting work remotely delay occasions: 0     
[2013-11-30 11:34:43] New blocks detected on network: 1
[2013-11-30 11:34:43] Summary of per device statistics:
[2013-11-30 11:34:43] GPU0     | (5s):0.000 (avg):0.000h/s | A:0 R:0 HW:0 WU:0.0/m

my GPU is properly detected:

11:34:56 me@ArchPC::~/Desktop cgminer -n
 [2013-11-30 11:36:35] CL Platform 0 vendor: NVIDIA Corporation                    
 [2013-11-30 11:36:35] CL Platform 0 name: NVIDIA CUDA                    
 [2013-11-30 11:36:35] CL Platform 0 version: OpenCL 1.1 CUDA 6.0.1                    
 [2013-11-30 11:36:35] Platform 0 devices: 1                    
 [2013-11-30 11:36:35]  0   GeForce 9600 GT                    
 [2013-11-30 11:36:35] 1 GPU devices max detected                    
 [2013-11-30 11:36:35] USB all: found 6 devices - listing known devices                    
 [2013-11-30 11:36:35] No known USB devices

What could the problem be?

EDIT: Just tried it without --scrypt... it works then, but I need scrypt for LTC. How do I fix this?

Answer 1

Apparently I do not have enough points yet to give your answer a vote, but your solution also worked for me! Adding -T to the command line command did the trick. Not only do I now get a neat output of what is happening; the -T parameter also made the entire mining process actually work!

Before adding the -T command: Screen flashed with the "Started CGMiner 3.7.2" message. No messages were shown until I pressed CTRL + C. The report said that only one share had been submitted and accepted - every time I ran CGMiner.

After adding the -T command: The screen doesn't flash any more. Everything that happens is outputted line by line to my command prompt. CGMiner is actually working and submitting shares. As we speak I'm on a total of 3616 accepted difficulty shares, contrary to 32 before.

Answer 2

Make sure your bat file has these two lines first

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1

Answer 3

-T flag fixed this for my laptop. Something with ncurses text formatting

Answer 4

In addition to the -T workaround, I found the fix for my machine was to delete the .bin file generated. The fault was reproducible every single time if I left it alone.

Since I execute from a batch file, I just added a line before executing cgminer:

del scrypt*.bin

Naturally, this deletes any .bin files prefixed with scrypt (leaving others alone if you're mining something else using the same base directory).

Answer 5

This was my problem as well, but hated running with the -T toggle on. I found out that it had to do with the ncurses lib missing on my freshly installed Win7 system, so after I installed cygwin cgminer worked without the -T toggle and with the normal stats screen.

Answer 6

Adding --no-restart to my command fixed this problem for my 290x setup