Can you also give the mainline kernel a try:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc1/
If the mainline kernel does not have the bug, please test the latest upstream 4.15 kernel: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.18/
Can you also give the mainline kernel a try:
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.17-rc1/
If the mainline kernel does not have the bug, please test the latest upstream 4.15 kernel: kernel. ubuntu. com/~kernel- ppa/mainline/ v4.15.18/
http://