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[Étienne BERSAC <bersace03@xxxxxxxxx>]

*** This bug is a duplicate of bug 1452858 ***
    https://bugs.launchpad.net/bugs/1452858

Public bug reported:

Hello,

I'm running Ubuntu on an iMac 12,2 since november 2012. From time to
time and more and more frequently the screen lit off. The only way i can
get it on is to suspend/resume. But then, it lit off soon. I suspect
some heating. Actually, the output of the cooling system is way hotter
with Ubuntu than Mac OS X.

So i would like to switch to the IGD card rather than the discrete one.
But there is no vga_switcheroo.

How to debug screen lit off ? How to detect screen heating ? How to
disable discrete card ? Is it kernel ? Xorg ? Where to search ?

Regards,
Étienne

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** This bug has been marked a duplicate of bug 1452858
   Screen lit off on iMac 12,2 after a while

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https://bugs.launchpad.net/bugs/1452855

Title:
  Screen lit off on iMac 12,2 after a while

Status in linux package in Ubuntu:
  New

Bug description:
  Hello,

  I'm running Ubuntu on an iMac 12,2 since november 2012. From time to
  time and more and more frequently the screen lit off. The only way i
  can get it on is to suspend/resume. But then, it lit off soon. I
  suspect some heating. Actually, the output of the cooling system is
  way hotter with Ubuntu than Mac OS X.

  So i would like to switch to the IGD card rather than the discrete
  one. But there is no vga_switcheroo.

  How to debug screen lit off ? How to detect screen heating ? How to
  disable discrete card ? Is it kernel ? Xorg ? Where to search ?

  Regards,
  Étienne

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