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You have been subscribed to a public bug:
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.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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[present + prime] HDMI output (nouveau) broken
https://bugs.launchpad.net/bugs/1374618
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