just for info : I tried also the kernel provided by https://launchpad.net/~kaihengfeng on post 90 ( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1766076/comments/90) but nothing changed
just for info : I tried also the kernel provided by https:/ /launchpad. net/~kaihengfen g on post 90 ( https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1766076/ comments/ 90) but nothing changed