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[Howard Cheng <1495110@xxxxxxxxxxxxxxxxxx>]

If I were to try to install an older kernel to see if I can roll back
and make it work again, what is a good version (let's say whatever is
available on 14.04 LTS around March 2015)?

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https://bugs.launchpad.net/bugs/1495110

Title:
  External VGA port on laptop does not work anymore

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have been using the laptop for almost 2 years now, and I have not
  had problem connecting to a projector via the external VGA port until
  recently.  Sometime between April and now, there must have been a
  kernel upgrade that messed it up.  I saw a few other bug reports that
  eventually suggests I go to kernel 3.16.0.

  When I was on 3.13.0-63, my VGA output would work with the boot up
  screen and the log in screen.  But once I log on the VGA port seems to
  be inactive and I can't get the output back.  HDMI still seems to
  work, though the projectors I have access to don't have HDMI inputs.

  After I upgraded to 3.16.0, the VGA output would still work during the
  boot up and log in.  Again, once I log on the VGA stopped working.
  However, when I switched to a text terminal (e.g. Ctrl-Alt-F1) I can
  see the VGA output again.  As soon as I switch back to GUI the VGA
  output stopped working.  The "Display" setting in System Settings
  cannot find an external monitor, nor could xrandr.

  My current work around is to use the HDMI port with an HDMI -> VGA
  converter.  That seems to do the trick for now.  Both Display setting
  and xrandr can see the HDMI connection.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-generic 3.13.0.63.71
  ProcVersionSignature: Ubuntu 3.16.0-49.65~14.04.1-generic 3.16.7-ckt15
  Uname: Linux 3.16.0-49-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  howard     2074 F.... pulseaudio
   /dev/snd/controlC1:  howard     2074 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Sep 12 09:48:27 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=931fa86c-ffc4-4421-95e5-3f0ed72ef187
  InstallationDate: Installed on 2014-01-10 (610 days ago)
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MachineType: Acer Aspire E1-472
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-49-generic root=UUID=17eb8564-5cc9-439a-aa44-2160ead649f4 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-49-generic N/A
   linux-backports-modules-3.16.0-49-generic  N/A
   linux-firmware                             1.127.15
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-08-14 (393 days ago)
  dmi.bios.date: 08/16/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: V2.04.
  dmi.board.name: EA40_HW
  dmi.board.vendor: Acer
  dmi.board.version: V2.04.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.04.
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV2.04.:bd08/16/2013:svnAcer:pnAspireE1-472:pvrV2.04.:rvnAcer:rnEA40_HW:rvrV2.04.:cvnAcer:ct9:cvrV2.04.:
  dmi.product.name: Aspire E1-472
  dmi.product.version: V2.04.
  dmi.sys.vendor: Acer

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