Hello fellow miners 
I have some troubles with 5870 cards running with cgminer 3.3.0 under linux (ubuntu 12.10, 3.5.0-28-generic kernel).
I setup drivers from AMD site for HD5*** series and tried different SDK version ( 2.5, 2,7, 2.8 ) but only got HW errors in cgminer, zero valid shares (tried various pools).
Interesting thing is i got it to work somehow yesterday and it was hashing bitcoins OK for several hours but after poweroff cycle for night, thing refuse to work again only generting HW errors...
Does someone know what combination of software required for this old cards?
For sure you have to take care that the SDK and the driver are compatible, there is somewhere an compatibility matrix on the AMD pages.I have some troubles with 5870 cards running with cgminer 3.3.0 under linux (ubuntu 12.10, 3.5.0-28-generic kernel).
I setup drivers from AMD site for HD5*** series and tried different SDK version ( 2.5, 2,7, 2.8 ) but only got HW errors in cgminer, zero valid shares (tried various pools).
Interesting thing is i got it to work somehow yesterday and it was hashing bitcoins OK for several hours but after poweroff cycle for night, thing refuse to work again only generting HW errors...
Does someone know what combination of software required for this old cards?
I had the same issue with an 5850 running Ubuntu 12.04.
If you let cgminer choose the settings HW errors may occur, because of a too low thread-concurrency
1) make sure to issue
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
in the console
2) start cgminer with worksize 256 and thread-concurrency of at least 4096 ( I think you can start right away with 8192)
RGDS