[Bug 90951] HD4000: Display connected to displayport doesn't wake up when it's turn off and on or enters power saving mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90951

--- Comment #4 from Thomas Mann <rauchwolke at gmx.net> ---
cat /sys/kernel/debug/dri/0/i915_power_domain_info
Power well/domain         Use count
always-on                 8
  PIPE_A                  1
  PIPE_B                  1
  PIPE_C                  0
  PIPE_A_PANEL_FITTER     0
  PIPE_B_PANEL_FITTER     0
  PIPE_C_PANEL_FITTER     0
  TRANSCODER_A            1
  TRANSCODER_B            1
  TRANSCODER_C            0
  TRANSCODER_EDP          0
  PORT_DDI_A_2_LANES      0
  PORT_DDI_A_4_LANES      0
  PORT_DDI_B_2_LANES      0
  PORT_DDI_B_4_LANES      1
  PORT_DDI_C_2_LANES      0
  PORT_DDI_C_4_LANES      0
  PORT_DDI_D_2_LANES      0
  PORT_DDI_D_4_LANES      0
  PORT_DSI                0
  PORT_CRT                0
  PORT_OTHER              1
  VGA                     0
  AUDIO                   0
  PLLS                    2
  INIT                    0

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