[Bug 111919] Intel card (Coffeelake) short freezes (hang) after upgrade to kernel 5.3.4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111919

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
rcs0 command stream:
  IDLE?: no
  START: 0x00009000
  HEAD:  0x00400820 [0x00000000]
  TAIL:  0x00000820 [0x00000000, 0x00000000]
  CTL:   0x00003001
  MODE:  0x00000000
  HWS:   0xffffe000
  ACTHD: 0x00000000 00400820
  IPEIR: 0x00000000
  IPEHR: 0x7a000004
  INSTDONE: 0xffdfffff
  SC_INSTDONE: 0xffffffff
  SAMPLER_INSTDONE[0][0]: 0xffffffff
  SAMPLER_INSTDONE[0][1]: 0xffffffff
  SAMPLER_INSTDONE[0][2]: 0xffffffff
  ROW_INSTDONE[0][0]: 0xffffffff
  ROW_INSTDONE[0][1]: 0xffffffff
  ROW_INSTDONE[0][2]: 0xffffffff
  BBADDR: 0x0000fffe_ec2fca94
  BB_STATE: 0x00000020
  INSTPS: 0x00008840
  INSTPM: 0x00000000
  FADDR: 0x00000000 00009820
  RC PSMI: 0x00000010
  FAULT_REG: 0x00000000
  GFX_MODE: 0x00008000
  PDP0: 0x0000000b7e32f000
  PDP1: 0x0000000000000000
  PDP2: 0x0000000000000000
  PDP3: 0x0000000000000000
  ring->head: 0x00000000
  ring->tail: 0x00000000
  hangcheck timestamp: 0ms (4395844992; epoch)
  engine reset count: 0
  ELSP[0]:  pid 801, seqno       15:0011639e!, prio 2, emitted -960ms, start
00009000, head 00000780, tail 00000820
  ELSP[1]:  pid 0, seqno        5:0000178c, prio -4093, emitted -959ms, start
00001000, head 000008c0, tail 00000928
  Active context: [0] hw_id 0, prio 0, guilty 0 active 0

The GPU did not do a context switch at the end of ELSP[0].

Seems like you are able to reproduce this fairly easily with your usage, could
you try setting i915.dmc_firmware_path=/dev/null on your kernel/grub
commandline?

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