Last post from me for while as dont appreciate my posts getting merged and deleted so just to thank PM and confirm now got 7 RX6800 XT running under ubuntu 20.04 with latest driver 21.40.1 and even gained a couple of extra hashes also like the labeling of GPU's good feature thanks for PM 5.9b. Note we are back to ROCM :-) but dont like the way AMD distribute this driver using package manager over a nice fat tarball download, I smell trouble ahead.
Available GPUs for mining:
GPU1: Gigabyte AMD Radeon RX 6800 XT (pcie 5), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU2: ASUS AMD Radeon RX 6800 XT (pcie

, OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU3: ASUS AMD Radeon RX 6800 XT (pcie 11), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU4: ASUS AMD Radeon RX 6800 XT (pcie 14), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU5: PowerColor AMD Radeon RX 6800 XT (pcie 22), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU6: Sapphire AMD Radeon RX 6800 XT (pcie 25), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU7: PowerColor AMD Radeon RX 6800 XT (pcie 28), OpenCL 2.0, 16 GB VRAM, 72 CUs
GPU1: 46C 60% 155W, GPU2: 44C 60% 149W, GPU3: 43C 60% 160W, GPU4: 46C 49% 154W, GPU5: 45C 49% 154W, GPU6: 42C 49% 153W, GPU7: 43C 49% 156W
GPU1: cclock 1200 MHz, cvddc 862 mV, mclock 1074 MHz, Tj 56C, Tmem 60C, 409 kH/J
GPU2: cclock 1200 MHz, cvddc 868 mV, mclock 1074 MHz, Tj 50C, Tmem 64C, 427 kH/J
GPU3: cclock 1200 MHz, cvddc 868 mV, mclock 1049 MHz, Tj 50C, Tmem 72C, 390 kH/J
GPU4: cclock 1200 MHz, cvddc 868 mV, mclock 1059 MHz, Tj 52C, Tmem 64C, 409 kH/J
GPU5: cclock 1200 MHz, cvddc 862 mV, mclock 1059 MHz, Tj 55C, Tmem 64C, 409 kH/J
GPU6: cclock 1200 MHz, cvddc 868 mV, mclock 1059 MHz, Tj 49C, Tmem 62C, 411 kH/J
GPU7: cclock 1200 MHz, cvddc 862 mV, mclock 1073 MHz, Tj 51C, Tmem 60C, 408 kH/J
GPUs power: 1081.0 W; total power: 1281.0 W; cost: 7.07 USD/day; 345 kH/J
Current -gt 15,15,15,15,15,15,15
Eth: Accepted shares 8 (0 stales), rejected shares 0 (0 stales)
Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.00%
Eth: Maximum difficulty of found share: 292.4 TH (!!!)
Eth: Average speed (5 min): 432.262 MH/s
Eth: Effective speed: 500.00 MH/s; at pool: 500.00 MH/s
Eth: Mining ETH on eth-eu1.nanopool.org:9999 for 0:11
Eth speed: 440.298 MH/s, shares: 33/0/0, time: 0:11
GPUs: 1: 63.070 MH/s (4) 2: 63.279 MH/s (5) 3: 62.158 MH/s (4) 4: 62.587 MH/s (6) 5: 62.616 MH/s (7) 6: 63.206 MH/s (4) 7: 63.384 MH/s (3)
Eth: Accepted shares 33 (0 stales), rejected shares 0 (0 stales)
Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.00%
Eth: Maximum difficulty of found share: 292.4 TH (!!!)
Eth: Average speed (5 min): 436.977 MH/s
Eth: Effective speed: 487.44 MH/s; at pool: 487.44 MH/s