Having same problems with HD6770. Maybe this is a driver issue (amd_bytealign function)? Using 13.12 driver with Vista64.
No problems with mining scrypt, but have erros with sha256 too: GPU0: invalid nonce - HW error.
Quark is using SHA-3, so if amd_bytealign implemented in miner's cernel - this can be a problem, as new ATI drivers has a littlebit different amd_bytealign function...
this is an issue with too small of share size
if you can somehow get the share difficulty up to .01 or preferably above .1 the HW errors will go away
How can I change pool's share difficulty?..
Don't think that problem is in difficulty. When debug mode enabled, getting error:
GPU0: invalid nonce - HW error
That is exactly the same as:
https://bitcointalk.org/index.php?topic=221041.0https://bitcointalk.org/index.php?topic=227918.0My current PC is not dedicated to mining. So I don't want to play instaling old driver. If only anyone could try with driver older than 13.4...or maybe there is a posibility to compile miner without amd_bytealign function (written what to change in links I've given)...