[Bug 112143] New: Built-in display corrupted after wake-up from S3 on Dell XPS 7390 2-in-1 (Ice Lake)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112143

            Bug ID: 112143
           Summary: Built-in display corrupted after wake-up from S3 on
                    Dell XPS 7390 2-in-1 (Ice Lake)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: inform at tiker.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I have a Dell XPS 7390 2-in-1, which use a "Intel(R) Core(TM) i7-1065G7 CPU @
1.30GHz". While the machine defaults to s2idle, energy consumption in that
state is high, which led me to investigate S3 sleep, enabled by

echo deep|sudo tee /sys/power/mem_sleep

This works well, except for one annoying showstopper wrinkle: The machine's
built-in display remains on a corrupted version of the Dell logo after wake-up.
All other aspects of the machine (including externally attached displays)
resume entirely fine, but the internal display remains garbled until a reset or
power cycle.

I've recorded a video to better convey what's happening:

https://ssl.tiker.net/nextcloud/s/jZQjjgjT2EwedBe

Notably, the pixel pattern in the corrupted logo *does* change in response to
interactions with the system, meaning that likely *some* part of the
framebuffer is being shown, but display state is not sufficiently reset to
enable proper display function.

Linux lightning 5.4.0-rc5 #1 SMP Sun Oct 27 12:56:36 CDT 2019 x86_64 GNU/Linux

-- Linux distribution:

  Debian testing/unstable

-- Machine or mother board model:

  From dmidecode:

  Handle 0x0100, DMI type 1, 27 bytes
  System Information
          Manufacturer: Dell Inc.
          Product Name: XPS 13 7390 2-in-1
          Version: Not Specified
          Serial Number: (redacted)
          UUID: (redacted)
          Wake-up Type: Power Switch
          SKU Number: 08B0
          Family: XPS

  Handle 0x0200, DMI type 2, 17 bytes
  Base Board Information
          Manufacturer: Dell Inc.
          Product Name: 06CDVY
          Version: A00
          Serial Number: (redacted)
          Asset Tag: Not Specified
          Features:
                  Board is a hosting board
                  Board is replaceable
          Location In Chassis: Not Specified
          Chassis Handle: 0x0000
          Type: Motherboard
          Contained Object Handles: 0

-- Display connector: (such as HDMI, DP, eDP, ...)

  Output of xrandr --verbose:
  https://gist.github.com/inducer/169409e85ee9a8999a7834f401558146

-- Register dumps before/after S3:

  https://gist.github.com/inducer/346c05cc9331c68213cda51e9bdbf7cc

-- Other version info

  https://gist.github.com/inducer/e51bb5bbfca3f307066b375b062e939d

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