[Bug 96914] [APL] too many voltage retries / CPU pipe B FIFO underrun when suspending to disk and crash after 25 iterations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96914

--- Comment #5 from Mauro Carvalho Chehab <mchehab at infradead.org> ---
(In reply to yann from comment #4)
> Christophe, please try with Imre's patch (also available at
> https://patchwork.freedesktop.org/series/10206/)

I'm having the same trouble with a Skull Canyon NUC. Those are the relevant drm
messages:

[    8.603825] [drm] Initialized drm 1.1.0 20060810
[    9.630681] [drm] Found 128MB of eDRAM
[    9.630906] [drm] Memory usable by graphics device = 4096M
[    9.630908] fb: switching to inteldrmfb from EFI VGA
[    9.630973] [drm] Replacing VGA console driver
[    9.637229] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    9.637230] [drm] Driver supports precise vblank timestamp query.
[    9.643972] [drm] Finished loading i915/skl_dmc_ver1_26.bin (v1.26)
[    9.911954] [drm] failed to retrieve link info, disabling eDP
[    9.913633] [drm] GuC firmware load skipped
[   10.346209] [drm] Initialized i915 1.6.0 20160711 for 0000:00:02.0 on minor
0
[   10.668749] fbcon: inteldrmfb (fb0) is primary device
[   10.879006] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[   10.915657] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[   11.354708] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   11.792904] [drm] RC6 on
[   15.501684] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[  283.095160] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun


The CPU is:

model name      : Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz

The dmidecode relevant data:

  BIOS Information
        Vendor: American Megatrends Inc.
        Version: KYSKLi70.86A.0041.2016.0817.1130
        Release Date: 08/17/2016

  Base Board Information
        Manufacturer: Intel Corporation
        Product Name: NUC6i7KYB
        Version: H90766-404

BIOS is using the default settings.

In my case, I'm using 3 monitors, one on each port (mini-DP, HDMI and USB-C),
as shown via xrandr:

  DP-1 connected 1920x1080+3840+0 (normal left inverted right x axis y axis)
510mm x 287mm
  DP-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm
x 286mm
  HDMI-3 connected primary 1920x1080+1920+0 (normal left inverted right x axis
y axis) 886mm x 498mm

I tested applying https://patchwork.freedesktop.org/series/10206/ on the top of
Kernel 4.8. No changes.

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