I been spending hours trying to get a HD4850 mining scrypt coins. Thought I would see if anybody could help me. This is the command i have try to start cgminer with.
--scrypt -T -o stratum+tcp://xxxxx.xxx -u xxxxxx -pxxxxxx --thread-concurrency 400 -I 10 -g 2 -w 128
It will just sit at setting pool difficulty. I change thread-concurrency from 400-3000, -g 1 and -g 2, I have also changed the worksize to 256. Nothing seems to work. I'm using the 13-9-legacy_vista_win7_64_dd_ccc_whql driver with the AMD-APP-SDK-v2.7-Windows-64. If i don't install the sdk opencl is not installed on the system. I've done multiple uninstalls of drivers and re-installs. Gpu-z and furmark both see opencl after the SDK. The bitminter program will mine as long as opencl is install but cgminer sits there stalled.
I have tried starting cgminer with
cgminer.exe --scrypt
and enter pool info. After hitting enter after the password it will just sit there doing nothing. I try using text only (-T)same thing.
Ian
EDIT: Turns out re-installing windows 7 and installing the driver fixed the issues that I was having. I used the latest driver for the card 13-9-legacy_vista_win7_64_dd_ccc_whql.exe