[Bug 95471] New: Lenovo L460: Hard lockup with external monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95471

            Bug ID: 95471
           Summary: Lenovo L460: Hard lockup with external monitors
           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: direx at betriebsdirektor.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123868
  --> https://bugs.freedesktop.org/attachment.cgi?id=123868&action=edit
dmesg with intel-drm-nightly

My Skylake Lenovo L460 hard freezes randomly if multiple monitors are
connected. With 4.6 mainline it is not as bad as with intel-drm-nightly. When
using only the integrated display (eDP1) everything runs smoothly without
lockup issues.

The monitors I have connected right now are conntected to the Ultra Dock
(DVI+HDMI), which comes with a Synaptics VMM2322 DP switch (FW: 2.30.000).

CPU: i5-6200U
Kernel: 4.6 with intel-drm-nightly
BIOS: 1.14
xf86-video-intel: 1:2.99.917+645+g88733a7-1
libdrm: 2.4.68-1
xorg-server: 1.18.3-1
Arch Linux

Ever since the watermark issues have been fixed (#89055) I am also getting FIFO
underruns:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

I don't know if this could be related to the lockups. Unfortunately I cannot
get a crash dump, as the entire machine locks up hard. Prior to the lockup
`drm/card0/error` is empty.

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