Since this issue is fixed in 4.12.1-041201-generic, we should be able to perform a "Reverse" bisect to identify the exact commit that fixes the bug. We can then SRU it to any prior kernel versions that need the fix.
Since this issue is fixed in 4.12.1- 041201- generic, we should be able to perform a "Reverse" bisect to identify the exact commit that fixes the bug. We can then SRU it to any prior kernel versions that need the fix.