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[Launchpad Bug Tracker <1573120@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: i915 (Ubuntu)
       Status: New => Confirmed

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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:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

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">>.
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  marco      7591 F.... pulseaudio
   /dev/snd/controlC0:  marco      7591 F.... pulseaudio
  CurrentDesktop: MATE
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-16 (5 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323.1)
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=UUID=b613d30c-820e-49a7-96fd-bd83a16a9147 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip disk lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/20/2016
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0354.2016.0120.0912
  dmi.board.name: NUC5i3RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H41000-502
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0354.2016.0120.0912:bd01/20/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC5i3RYB:rvrH41000-502:cvn:ct3:cvr:

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