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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 107489
           Summary: [SKL] Sometimes fails to DPMS on
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mattst88 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On my Lenovo P50, I'd guess 1/4 of the time it attempts to DPMS on, it fails to
modeset, leaving me with a black screen.

In my dmesg I see:

[drm:intel_dp_start_link_train] *ERROR* [CONNECTOR:71:eDP-1] Link Training
failed at link rate = 540000, lane count = 4

This has occurred with every kernel I've used on this machine, 4.9 to 4.17.5.

Typically closing the lid and letting the machine suspend/resume is sufficient
to get it back.

# lspci -s 0:02 -nn
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics P530
[8086:191d] (rev 06)

# xrandr -q
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 8192 x 8192
eDP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y
axis) 346mm x 194mm
   3840x2160     60.00*+

Running xserver-1.19.5 and the modesetting driver.

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