/sys readonly with backports kernel 3.16

[Dennis Birkholz <debian-user@lists.nexxes.org>]

Hi together,

I switched from the Wheezy stable kernel to the latest kernel in
backports (3.16.3-2~bpo70+1).
Now I can not write-mount /sys any more, thus I can not trigger RAID
check actions, etc.

I tried remounting it (mount -o remount -w /sys), but I can not get it
to be writable. Is this intended in the new kernel version or is just
some new config option missing?

Greets,
Dennis