Today I have update to kernel 4.6 which does not longer have the issues showed below. I see only one error message from the kernel which seem to have no noteable influence: Mai 25 10:46:22 c-web3 kernel: mei_wdt mei::05b79a6f-4628-4d7f-899d-a91514cb32ab:02: Could not register event ret=-22 Mai 25 10:46:22 c-web3 kernel: mei_wdt: probe of mei::05b79a6f-4628-4d7f-899d-a91514cb32ab:02 failed with error -22 Thank you, Takashi, for your support! You may close the issue.