ACTHD: 0x00000058
EIR: 0x00000000
EMR: 0xffffff69
ESR: 0x00000000
PGTBL_ER: 0x00000000
IPEHR: 0x01000000
IPEIR: 0x00000000
INSTDONE: 0x00ffffc0
  busy: GMBUS
  busy: FBC
  busy: BINNER
  busy: Secondary ring 3
  busy: Secondary ring 2
  busy: Secondary ring 1
  busy: Secondary ring 0
  busy: Primary ring 1
  busy: Primary ring 0
Ringbuffer: Reminder: head pointer is GPU read, tail pointer is CPU write