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[zub <zub@xxxxxxxxxxxxxxxxxx>]

I did the full reverse commit bisect and found out the commit that fixes
the issue is:

commit 0434848e444b31ea862743b720585c127b8114c2
Author: Adam Lee <adam.lee@xxxxxxxxxxxxx>
Date:   Wed Jan 28 15:30:27 2015 -0500

    Bluetooth: ath3k: workaround the compatibility issue with xHCI
controller

I have no idea why this BT driver change affects backlight, but I
checked twice, and I can confirm that with commit
9786567e45eee30e68af97926de96905e765e48d the display is indeed black
(i.e. the issue reported in this ticket manifests) and with
0434848e444b31ea862743b720585c127b8114c2 the display works again.

I looked into BIOS Setup to see if I could perhaps disable bluetooth
there to see if it changes anything, but there it no option to disable
bluetooth.

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

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https://bugs.launchpad.net/bugs/1472794

Title:
  [Acer Aspire 5250] Black screen after upgrade to 3.19.0-22-generic

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrade to linux-image-3.19.0-22-generic on Acer Aspire
  5250/HMA51-BZ there is nothing displayed after Grub. Playing with
  (Ctrl-)Alt-F1, F2, ..., F7, F8... doesn't have any visible effect - so
  neither VT nor X is visible. Removing "quiet splash" from kernel
  arguments also doesn't show anything after the message from grub that
  it's loading the kernel.

  The laptop seems to boot normally, I can hear the lightdm sound that
  it's ready, but I cannot see anything on the display. I can log in
  remotely. The backlight is on, so it's not a cause of no backlight. (I
  checked this by poking around /sys/class/backlight and I see it's set
  at full brightness.)

  If I boot linux-image-3.19.0-21-generic everything works OK.

  I don't see anything obvious when I look at the diff of dmesg between
  3.19.0-21 and 3.19.0.22, but if it's useful I can attach dmesg from
  3.19.0-21.

  According to lspci this is the GPU:
  00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6310]

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-22-generic 3.19.0-22.22
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Jul  8 22:49:55 2015
  HibernationDevice: RESUME=UUID=2552e9df-add8-4cc9-abe7-e75f869c1d08
  InstallationDate: Installed on 2013-02-14 (873 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  Lsusb:
   Bus 002 Device 002: ID 064e:d250 Suyin Corp. 
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Acer Aspire 5250
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-22-generic root=UUID=84cf2e2d-2e23-4ced-a3ed-94d793f6cefd ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-22-generic N/A
   linux-backports-modules-3.19.0-22-generic  N/A
   linux-firmware                             1.143.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-07-02 (5 days ago)
  dmi.bios.date: 11/17/2011
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.06
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: HMA51-BZ
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.06
  dmi.modalias: dmi:bvnAcer:bvrV1.06:bd11/17/2011:svnAcer:pnAspire5250:pvrV1.06:rvnAcer:rnHMA51-BZ:rvrBaseBoardVersion:cvnAcer:ct10:cvrV1.06:
  dmi.product.name: Aspire 5250
  dmi.product.version: V1.06
  dmi.sys.vendor: Acer

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