[Bug 90963] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

--- Comment #59 from pepe_commerz at gmx.net ---
Same or related issue on Lenovo T460p with Fedora 25. Cannot reliably reproduce
but happens every couple days in interaction with external DP, docking station,
and/or s2ram.

Concrete exsample: Waking from s2ram, plug in mini-DP, screen switches but I
get a small black rectangle in the middle of the external screen. Mouse cursor
moving but buttons/key presses have no effects. I can typically switch to
console and restart lightdm to fix the issue. dmesg|grep drm\|i915 looks like
this:

[    1.716275] [drm] Initialized
[    1.965209] i915 0000:00:02.0: enabling device (0006 -> 0007)
[    1.965771] [drm] Memory usable by graphics device = 4096M
[    1.965773] fb: switching to inteldrmfb from EFI VGA
[    1.965856] [drm] Replacing VGA console driver
[    1.971139] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.971140] [drm] Driver supports precise vblank timestamp query.
[    1.979746] [drm] Finished loading i915/skl_dmc_ver1_26.bin (v1.26)
[    1.981505] i915 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=mem
[    1.998080] [drm] GuC firmware load skipped
[    2.000761] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor
0
[    2.069638] fbcon: inteldrmfb (fb0) is primary device
[    3.304450] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    3.793494] [drm] RC6 on
[    4.309945] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[50844.645191] [drm] GuC firmware load skipped
[50847.128957] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[50847.402344] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization
[50847.670600] [drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate
vcpi
[50847.966196] [drm] RC6 on

In other cases I get a complete freeze with kernel talking about NMI and 30sec
reboot countdown. These don't seem to be recorded in the systemd journal.

System info:
* Platform: Lenovo T460p, Fedora 25
* Graphics: Intel Corporation HD Graphics 530 (rev 06)
* kernel: 4.10.13-200.fc25.x86_64
* libdrm: 2.4.79
* xorg-server 1.19.3
* xorg-x11-drv-intel 2.99.917


Tell me if I can do anything to help debugging this.

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