> We suspect that the problem is caused by the kernel upgrade

Have you tried booting your old/original kernel? Unless you've removed
it, it should still be there and selectable on the grub boot screen.
That should help narrow down if it's really the kernel, or if
something else changed along the way to cause the problem.

> We all really pissed off for spending a whole day
> on this problem

I have a theory. You know how dogs and wolves seem to sense fear and
use that to their advantage? I think computers sense frustration, and
that just encourages them :).

                                                         - Bluejay Adametz

If you push something hard enough, it will fall over.

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