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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1573120

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1573120

Title:
  VGA monitor goes to sleep randomly in 16.04

Status in i915 package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Without any clear correlation to events, the VGA output of my
  NUC5i3RYH goes to sleep, while the other output (HDMI) has no problem.

  The running system is Ubuntu MATE 16.04 amd64 with kernel
  4.4.0-21.37-generic 4.4.6

  The NUC5i3RYH has an onboard HD Intel 5500.

  It does NOT happen in 14.04 nor in 15.10.

  The monitor can be waken up again with xrandr with this script:

       ### Switch off DP1 = VGA
       xrandr --output HDMI1 --mode 1280x1024 --output DP1 --off

       sleep 1

       ### Turns it on again
       xrandr --output HDMI1 --mode 1280x1024 --output DP1 --mode 1280x1024 --auto --right-of HDMI1 --primary

  The only info I found is in kern.log:

       [80299.466886] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
  *ERROR* CPU pipe A FIFO underrun

  No info in Xorg.log

  Will someone please help?

  Thanks.

  Marco

  The relevant part of lspci about the GPU is:

  00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Intel Corporation Broadwell-U Integrated Graphics [8086:2057]
   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 0
   Interrupt: pin A routed to IRQ 45
   Region 0: Memory at a9000000 (64-bit, non-prefetchable) [size=16M]
   Region 2: Memory at b0000000 (64-bit, prefetchable) [size=256M]
   Region 4: I/O ports at 2000 [size=64]
   Expansion ROM at <unassigned> [disabled]
   Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Address: fee00018  Data: 0000
   Capabilities: [d0] Power Management version 2
    Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [a4] PCI Advanced Features
    AFCap: TP+ FLR+
    AFCtrl: FLR-
    AFStatus: TP-
   Kernel driver in use: i915
   Kernel modules: i915

  I've tried to report the bug in the i915 package but the launchpad
  reports <<"i915" does not exist in Ubuntu. Please choose a different
  package. If you're unsure, please select "I don't know">>.

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