v15.0 doesn't seem to work for me on Linux for NVidia, driver version 455/cuda11.1.
You specified default wallet address, it is good for tests only, for normal mining you must change it to your wallet address!
ETH: 1 pool is specified
Main Ethereum pool is us1.ethpool.org:3333
DCR: 1 pool is specified
Main Decred pool is dcr.suprnova.cc:3252
Cannot load OpenCL library, AMD cards will be unavailable
Be careful with overclocking, use default clocks for first tests
Press "s" for current statistics, "0".."9" to turn on/off cards, "r" to reload pools, "e" or "d" to select current pool, "x" to select GPU
CUDA initializing...
NVIDIA Cards available: 2
CUDA Driver Version/Runtime Version: 11.1/8.0
GPU #0: GeForce RTX 2080 Ti, 11018 MB available, 68 compute units, capability: 7.5 (pci bus 1:0:0)
GPU #1: GeForce RTX 3080, 10018 MB available, 68 compute units, capability: 8.6 (pci bus 3:0:0)
Total cards: 2
ETH: Stratum - connecting to 'us1.ethpool.org' <172.65.229.54> port 3333 (unsecure)
ETH: Stratum - Connected (us1.ethpool.org:3333) (unsecure)
ETH: Authorized
DUAL MINING MODE ENABLED: ETHEREUM+DECRED
ETH: eth-proxy stratum mode
Watchdog enabled
Remote management (READ-ONLY MODE) is enabled on port 3333
DCR: Stratum - connecting to 'dcr.suprnova.cc' <104.248.240.136> port 3252 (unsecure)
DCR: Stratum - Connected (dcr.suprnova.cc:3252) (unsecure)
Socket was closed remotely (by pool)
DCR: Job timeout, disconnect, retry in 20 sec...
Setting DAG epoch #366(3.86GB)...
server: bind failed with error: 98 (check -mport option value), next attempt in 20sec...
ETH: 10/04/20-00:09:29 - New job from us1.ethpool.org:3333
ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
ETH: 10/04/20-00:09:30 - New job from us1.ethpool.org:3333
ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
ETH: 10/04/20-00:09:30 - New job from us1.ethpool.org:3333
ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
Setting DAG epoch #366 for GPU0
Setting DAG epoch #366 for GPU1
Create GPU buffer for GPU0
Create GPU buffer for GPU1
GPU 1, GpuMiner cu_kd failed 8 (0), invalid device function
GPU 0, GpuMiner cu_kd failed 8 (0), invalid device function
GPU 0, Calc DAG failed!
GPU 1, Calc DAG failed!
ETH: 10/04/20-00:09:33 - New job from us1.ethpool.org:3333
ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
ETH: 10/04/20-00:09:34 - New job from us1.ethpool.org:3333
ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s
GPU 0 failed
GPU 1 failed
Setting DAG epoch #366 for GPU0
Setting DAG epoch #366 for GPU1
GPU 1, GpuMiner cu_kd failed 8 (0), invalid device function
GPU 1, Calc DAG failed!
GPU 0, GpuMiner cu_kd failed 8 (0), invalid device function
GPU 0, Calc DAG failed!
Quit signal received...
Quit, please wait...
GPU 0 failed
GPU 1 failed