Comment # 3 on bug 1195857 from Takashi Iwai

Could you identify which previous kernel still worked and which new one
doesn't?
You can find the older kernels in TW history repo, too,
  https://download.opensuse.org/history/

About the firmware: the firmware file with the machine name is for a
vendor-specific firmware.  The driver tries to load it at first, then falls
back to more generic firmware files.  Typically used for Raspberry Pi.