Public bug reported:

I am using latest development version of xenial (ubuntu 16.04).

My video card is AMD HD7950, and I use an MiniDP-to-DP line to connect
it with an Acer XB240H display.

With fglrx or fglrx-updates installed, everything renders extremely
slow, even raw terminal renders like 100 lines per second.

Workarounds failed:

* AMD official driver failed to build due to bug #1502978.
* The open source driver can only provide 1024x768 resolution.

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

** Description changed:

+ I am using latest development version of xenial (ubuntu 16.04).
+ 
  My video card is AMD HD7950, and I use an MiniDP-to-DP line to connect
  it with an Acer XB240H display.
  
  With fglrx or fglrx-updates installed, everything renders extremely
  slow, even raw terminal renders like 100 lines per second.
  
  Workarounds failed:
  
  * AMD official driver failed to build due to bug #1502978.
  * The open source driver can only provide 1024x768 resolution.

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https://bugs.launchpad.net/bugs/1550910

Title:
  fglrx renders extremely slow in latest kernels

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