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[Bug 1507689] Re: Shaky screen on Lenovo Y70 Touch


Found some references to what seem to be the same problem on askubuntu



Seems like I have to update the kernel.  (IE. some updates are missing
in the 3.16.0-xx kernel)

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  Shaky screen on Lenovo Y70 Touch

Status in linux package in Ubuntu:

Bug description:
  I have a relatively new Lenovo Y70 Touch (came preinstalled with
  Win8).  I installed Ubuntu 14.04 on it.

  By "Shaky" (in the headline) I mean that the image shakes from side to
  side (it seems) about 3 points. Some points end up at the end of the
  previous line.  Very annoying to look at.  Before changing anything,
  the screen driver seems to be an intel driver.  (There is a combined
  NVidia and Intel screen card.)  It is also possible to change the
  screen backlight by using the buttons.

  Searching on the web I found that I could add "nomodeset" to the
  kernel command line.  Doing this stabilizes the screen, but the
  control of the screen backlight disappears.

  If I in addition add "acpi_osi=Linux" and "acpi_backlight=vendor", the
  backlight-control app seems to be back, but there is no reaction to
  any changes. "ls  /sys/class/backlight" now shows the name ideapad.

  Along the way to the current workaround, I have had bumblebee and some
  other software installed and automatically removed as it was not

  I believe this applies to other distributions as well.

  Numbered questions and answers (found under "We also need:" in th
  1) Output from "lsb_release -rd":
  Description:	Ubuntu 14.04.3 LTS
  Release:	14.04

  2) Outut from "apt-cache policy linux*":
  see attached file "policy"

  3) What I expect to happen:
    a. That the screen would be stabile from the start of the installation
    b. That the backlight control would be available from the start of the installation and not disappear.

  4) What happened instead:
    a. The screen was "shaking" from the start.  (Not a stabile image at all.)
    b. After adding a fix (see above) the screen became stabile but the screen backlight control disappeared.  No remedy has been found for this.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-50-generic 3.16.0-50.67~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-50.67~14.04.1-generic 3.16.7-ckt16
  Uname: Linux 3.16.0-50-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Oct 19 16:34:08 2015
  InstallationDate: Installed on 2015-06-11 (130 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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