Comment # 19 on bug 1182259 from Takashi Iwai

It'd be great if you can test my test kernel available at:
  http://download.opensuse.org/repositories/home:/tiwai:/bsc1182259/standard/
It has only kernel-default, but you can install both kernel-preempt and
kernel-default at the same time without problems.  Note that it's signed with
an unofficial key, so Secure Boot won't work; disable Secure Boot on BIOS
beforehand if it's been enabled.

The kernel above contains the additional upstream fix instead of reverting the
patch that introduced a bug.  I'm reluctant to merge those fixes to Leap at
this time unless it's tested on the actual hardware...