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[Bug 1374618] Re: [present + prime] HDMI output (nouveau) broken

 

Jean-Louis Dupond, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect -p xorg 1374618

Please ensure you have the package xdiagnose installed, and that you
click the Yes button for attaching additional debugging information.

When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
functionality at https://wiki.ubuntu.com/ReportingBugs.

** No longer affects: xserver-xorg-video-intel (Ubuntu)

** Project changed: xserver-xorg-video-intel => xorg (Ubuntu)

** Changed in: xorg (Ubuntu)
   Importance: Medium => Undecided

** Changed in: xorg (Ubuntu)
       Status: Confirmed => New

** Changed in: xorg (Ubuntu)
 Remote watch: freedesktop.org Bugzilla #84298 => None

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1374618

Title:
  [present + prime] HDMI output (nouveau) broken

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I recently upgraded my system to Ubuntu 14.10.
  Now when testing HDMI, I hit some bug.

  My system is an optimus laptop.
  The HDMI is connected to a nvidia card.

  Now the HDMI has signal, and while logging in (so when Xorg is
  starting) I can shortly move my cursor over the external display. But
  when login is complete, the external display is 1 artifact, and
  doesn't show any updates anymore.

  So I started bisecting the version from 14.10 to 14.04 (where it was
  working).

  And I found out the following commit caused the issue:
  commit 975b9798be77b30cbed485583d0ccb48318708f7
  Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
  Date:   Wed May 21 08:58:24 2014 +0100

      sna: Add support for Present
      
      Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>

  
  Now I recompiled the intel driver without the commit, and that fixes the issue.
  Another option is to use --disabled-dri3.

  My hardware
  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
  01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M] (rev a1)

  The driver I use for the nvidia card is nouveau.

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