[Bug 597070] Re: Imac Radeon HD 4850 switch "Mini Display Port" output during install resulting black screen

[artik]

** Attachment added: "version.log"
   http://launchpadlibrarian.net/50712119/version.log

** Description changed:

  I tried to install Lucid on the new Apple Imac27" with ATI radeon HD
  4850 video card. After selected "install", the screen goes black. few
  investigations later, I discovered display output switch to the Mini
- Display Port. So, I treid to connect a second screen, and I was right :
- just after select "install lucid", the video outuput switch to the
- second screen, and the main screen turn black.
+ Display Port. So, I tried to connect a second screen, and I was right :
+ just after select "install lucid", the video output switch to the second
+ screen, and the main screen turn black.
  
  I continue my installation using my 2nd screen (connected to the mini
  display port), and after it, I'm on the desktop. I activate Open radeon
- drivers, the works perfectly, but in the second screen. Impossible to
- switch to the main screen. It's not reconized, and stay black.
+ drivers, they works perfectly, but in the second screen. Impossible to
+ switch to the main screen. It's not recognized, and stay black.
  
  I tried proprietary ati drivers (10.6). With them, I can activate my
  main screen, but they are not better than the open ones : there is a big
  vsync bug. Actually, It's totally impossible for a normal user to use
  open ati drievrs on the main screen with an Imac27 and ati radeon 4850
- graphik card.
+ graphic card.
  
- I think issue is in the kms driver, I tried to desactivate them. Main
- screen is reconized, but impossible to turn it on, it stay black, and
+ I think issue is in the kms driver, I tried to deactivate them. Main
+ screen is recognized, but impossible to turn it on, it stay black, and
  Vsync issue re-appear on the second screen.
  
  i tried 2.6.32, 2.6.34, 2.6.35 rc1 released, bug is still here.

** Description changed:

  I tried to install Lucid on the new Apple Imac27" with ATI radeon HD
  4850 video card. After selected "install", the screen goes black. few
  investigations later, I discovered display output switch to the Mini
  Display Port. So, I tried to connect a second screen, and I was right :
  just after select "install lucid", the video output switch to the second
  screen, and the main screen turn black.
  
  I continue my installation using my 2nd screen (connected to the mini
  display port), and after it, I'm on the desktop. I activate Open radeon
- drivers, they works perfectly, but in the second screen. Impossible to
- switch to the main screen. It's not recognized, and stay black.
+ drivers, they works perfectly, but in the second screen (Vsync is
+ perfect, and very smooth using compiz). Impossible to switch to the main
+ screen. It's not recognized, and stay black.
  
  I tried proprietary ati drivers (10.6). With them, I can activate my
  main screen, but they are not better than the open ones : there is a big
  vsync bug. Actually, It's totally impossible for a normal user to use
- open ati drievrs on the main screen with an Imac27 and ati radeon 4850
+ open ati drivers on the main screen with an Imac27 and ati radeon 4850
  graphic card.
  
  I think issue is in the kms driver, I tried to deactivate them. Main
  screen is recognized, but impossible to turn it on, it stay black, and
- Vsync issue re-appear on the second screen.
+ Vsync issue re-appear on the second screen. Maybe the open radeon
+ drivers also got a bug, cause after deactivate them, my main screen is
+ now recognized on display manager, but impossible after activate it, it
+ stay black => back to proprietary drivers, and the Vsync issue)
  
  i tried 2.6.32, 2.6.34, 2.6.35 rc1 released, bug is still here.

-- 
Imac Radeon HD 4850 switch "Mini Display Port" output during install resulting black screen
https://bugs.launchpad.net/bugs/597070
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