Comment # 1 on bug 1101143 from Takashi Iwai

Could you try the kernel in OBS Kernel:openSUSE-15.0 repo?
   http://download.opensuse.org/repositories/Kernel:/openSUSE-15.0/standard/

This should be already containing most of backports.

If this still doesn't work, please take alsa-info.sh output on both Leap 15.0
and TW kernels.  Run the script with --no-upload option, and attach the outputs
to Bugzilla.