[Bug 107489] [SKL] Sometimes fails to DPMS on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107489

--- Comment #7 from Matt Turner <mattst88 at gmail.com> ---
Created attachment 141086
  --> https://bugs.freedesktop.org/attachment.cgi?id=141086&action=edit
drm-debug.log.gz

The attached log was captured with drm.debug=0x1e log_buf_len=4M

Snippet of relevant part (I think):

Aug 14 13:44:32 p50 kernel: [drm:edp_panel_on] Wait for panel power on
Aug 14 13:44:32 p50 kernel: [drm:wait_panel_status] mask b000000f value
80000008 status 0000000a control 00000003
Aug 14 13:44:32 p50 kernel: [drm:gen8_de_irq_handler] hotplug event received,
stat 0x01000000, dig 0x12101010, pins 0x00000010
Aug 14 13:44:32 p50 kernel: [drm:intel_hpd_irq_handler] digital hpd port A -
long
Aug 14 13:44:32 p50 kernel: [drm:intel_hpd_irq_handler] Received HPD interrupt
on PIN 4 - cnt: 0
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_hpd_pulse] ignoring long hpd on eDP
port A
Aug 14 13:44:32 p50 kernel: [drm:wait_panel_status] Wait complete
Aug 14 13:44:32 p50 kernel: [drm:intel_power_well_enable] enabling DDI A/E IO
power well
Aug 14 13:44:32 p50 kernel: [drm:edp_panel_vdd_on] Turning eDP port A VDD on
Aug 14 13:44:32 p50 kernel: [drm:edp_panel_vdd_on] PP_STATUS: 0x80000008
PP_CONTROL: 0x0000000b
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 00000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
0
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 0
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_program_link_training_pattern] Using
DP training pattern TPS1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_start_link_train] clock recovery OK
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_start_link_train] 5.4 Gbps link rate
without sink TPS3 support
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_program_link_training_pattern] Using
DP training pattern TPS2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 08000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 08000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 08000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 08000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using signal
levels 08000000
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using vswing level
2
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_set_signal_levels] Using pre-emphasis
level 1
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_dump_link_status] ln0_1:0x11
ln2_3:0x11 align:0x0 sink:0x0 adj_req0_1:0x66 adj_req2_3:0x66
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_start_link_train] Channel
equalization failed 5 times
Aug 14 13:44:32 p50 kernel: [drm:intel_dp_start_link_train] *ERROR*
[CONNECTOR:71:eDP-1] Link Training failed at link rate = 540000, lane count = 4

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