To wrap up my previous couple of comments and hopefully bisect the problem, I can state the following (thanks to BTRFS):
This problem didn't / does not exist with:
Description: Ubuntu Yakkety Yak (development branch) Linux acer07 4.8.0-21-generic #23-Ubuntu SMP Tue Oct 4 18:27:25 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ii nvidia-304 304.131-0ubuntu5 amd64 NVIDIA legacy binary driver - version 304.131
This problem exists with:
Description: Ubuntu 16.10 Linux acer07 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ii nvidia-304 304.132-0ubuntu1 amd64 NVIDIA legacy binary driver - version 304.132
Sorry, I don't have any more intermediary points.
To wrap up my previous couple of comments and hopefully bisect the problem, I can state the following (thanks to BTRFS):
This problem didn't / does not exist with:
Description: Ubuntu Yakkety Yak (development branch)
Linux acer07 4.8.0-21-generic #23-Ubuntu SMP Tue Oct 4 18:27:25 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
ii nvidia-304 304.131-0ubuntu5 amd64 NVIDIA legacy binary driver - version 304.131
This problem exists with:
Description: Ubuntu 16.10
Linux acer07 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
ii nvidia-304 304.132-0ubuntu1 amd64 NVIDIA legacy binary driver - version 304.132
Sorry, I don't have any more intermediary points.