Kai-Heng, I have tested mainline kernel 4.18-rc3 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18-rc3/ and it seems not to fix the issue.
Kai-Heng, I have tested mainline kernel 4.18-rc3 from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.18-rc3/ and it seems not to fix the issue.