Hubert Hesse, regarding your question, bisecting the Ubuntu kernel can be tricky, hence you are better off refocusing onto the reverse bisect of the mainline kernel to confirm the fix commit, and reverting it causes the issue again.
Hubert Hesse, regarding your question, bisecting the Ubuntu kernel can be tricky, hence you are better off refocusing onto the reverse bisect of the mainline kernel to confirm the fix commit, and reverting it causes the issue again.