Revert "[dags] update drivers 04.12.2014"

This reverts commit 286b5a0410433a7e8d25914e91c0ddf0baf88e1f.

bug with many channels
Revert "[zgemmer] switch to kernel 3.17.2"

This reverts commit 786f678ed81cf716c29b6f34177b79b4a16ba8e0.

not working