[Bug 106829] New: Screen flicker in kernel 4.16, fine in 4.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106829

            Bug ID: 106829
           Summary: Screen flicker in kernel 4.16, fine in 4.15
           Product: DRI
           Version: unspecified
          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: henry.baldursson at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140036
  --> https://bugs.freedesktop.org/attachment.cgi?id=140036&action=edit
dmesg

-- system architecture: x86_64
-- kernel version: Linux version 4.16.13-1-ARCH (builduser at heftig-15406) (gcc
version 8.1.0 (GCC)) #1 SMP PREEMPT Thu May 31 23:29:29 UTC 2018
-- Linux distribution: Antergos (Arch clone)
-- Machine or mother board model: Lenovo Yoga 910, Core i7-7500U, HD Graphics
620
-- Display connector: Integral

-- Kernel command line params: quiet drm.debug=0x1e log_buf_len=1M
i915.enable_rc6=0 i915.enable_psr=0 i915.enable_guc_loading=1
i915.enable_guc_submission=1
(most of those are as a result of me trying to fix this on my own)


I've waited for this to clear up, but it hasn't so either my system is
misconfigured or I'm running into a bug.

The error logged is this: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun

Here's a GIF of what I'm seeing:
https://gfycat.com/UnsightlyWellinformedAlligator

I'm running Wayland 1.15.0, Gnome 3.28.2, GDM 3.28.1.

As soon as I boot a 4.16 kernel the screen starts flickering. Downgrading to
4.15.11 fixes it right up.

I can't dump vbios as I get an Input/Output error. Never messed with that
before so no idea if related.

== dmesg (also attached): https://pastebin.com/JkQsCmLs
== intel_reg dump: https://pastebin.com/PjQsYQFp

Any ideas?

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