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On 2014-09-24T21:41:43+00:00 Jean-Louis Dupond wrote:

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 with --disabled-dri3, and that fixes the issue also.

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.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1374618/comments/0


** Changed in: xserver-xorg-video-intel
       Status: Unknown => Confirmed

** Changed in: xserver-xorg-video-intel
   Importance: Unknown => Medium

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

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

Status in X.org xf86-video-intel:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  New

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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