Bug 91796 - [IVB] video output failed resume from RAM, [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
Summary: [IVB] video output failed resume from RAM, [drm:intel_dp_start_link_train] *...
Status: CLOSED INVALID
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-08-28 16:13 UTC by Chris Bainbridge
Modified: 2017-06-02 12:19 UTC (History)
1 user (show)

See Also:
i915 platform: IVB
i915 features: display/DP, power/suspend-resume

Attachments
dmesg (767.24 KB, text/plain)
2015-08-28 16:13 UTC, Chris Bainbridge 		no flags Details
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Description Chris Bainbridge 2015-08-28 16:13:26 UTC 
Created attachment 117971 [details]
dmesg

Observed on Linux 4.2.0-rc7
Hardware IvyBridge Macbook with triple monitors

One monitor failed to come back after suspend to ram
Using xrandr --off then --auto successfully turned the monitor back on

dmesg with drm.debug=0xe attached, relevant bit is:

[207696.676767] [drm:intel_get_shared_dpll] using PCH DPLL B for pipe B
[207696.676770] [drm:intel_prepare_shared_dpll] setting up PCH DPLL B
[207696.677329] [drm:cpt_set_fdi_bc_bifurcation] enabling fdi C rx
[207696.677489] [drm:ivb_manual_fdi_link_train] FDI_RX_IIR before link train 0x0
[207696.677497] [drm:ivb_manual_fdi_link_train] FDI_RX_IIR 0x100
[207696.677498] [drm:ivb_manual_fdi_link_train] FDI train 1 done, level 0.
[207696.677505] [drm:ivb_manual_fdi_link_train] FDI_RX_IIR 0x200
[207696.677507] [drm:ivb_manual_fdi_link_train] FDI train 2 done, level 0.
[207696.677507] [drm:ivb_manual_fdi_link_train] FDI train done.
[207696.677510] [drm:intel_enable_shared_dpll] enable PCH DPLL B (active 0, on? 0) for crtc 25
[207696.677511] [drm:intel_enable_shared_dpll] enabling PCH DPLL B
[207696.681419] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.685001] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.689080] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.690500] [drm:intel_dp_sink_dpms] failed to enable sink power state
[207696.693080] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.695653] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.695658] [drm:intel_dp_set_signal_levels] Using signal levels 04000000
[207696.695659] [drm:intel_dp_set_signal_levels] Using vswing level 2
[207696.695660] [drm:intel_dp_set_signal_levels] Using pre-emphasis level 0
[207696.698271] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.698279] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
[207696.700892] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
[207696.700898] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization
[207696.703424] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145003f
Comment 1 Jari Tahvanainen 2017-03-02 09:33:04 UTC 
Chris - I'm really sorry for this being neglected for long time. Is this still a problem? If it is, could you please provide information from your current setup, which assumable is not the one from 1,5 years back...
Comment 2 Ricardo 2017-05-30 21:20:14 UTC 
based on the lack of activity and a response from the submitter to update results with latest configuration the bug will be closed

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