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[Bug 1529020] Re: Braswell: CPU pipe C FIFO underrun when mouse pointer changes display

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sun, 10 Jan 2016 05:56:53 -0000
Reply-to: Bug 1529020 <1529020@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Sergiu Sincan, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1529020

** Package changed: linux-lts-vivid (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

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https://bugs.launchpad.net/bugs/1529020

Title:
  Braswell: CPU pipe C FIFO underrun when mouse pointer changes display

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Machine is a HP 250 G4 notebook with Celeron N3050, with BIOS F.1A
  Rev.A (latest).

  When I add a external display (VGA, 1920x1080@60Hz), sometimes when I cross over to it with the mouse cursor, it flickers (turns off for about 1-2 seconds), and I get:
  [  692.452293] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe C FIFO underrun.
  It will do this for 2-3 times, and then it will turn off completely (external display has no VGA signal).

  Also reproduces with Kubuntu 15.10 (in Live mode).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-intel-lts-vivid 2:2.99.917-1~exp1ubuntu2.2~trusty1
  ProcVersionSignature: Ubuntu 3.19.0-42.48~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-42-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Dec 24 10:03:17 2015
  InstallationDate: Installed on 2015-12-23 (0 days ago)
  InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: xserver-xorg-video-intel-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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