I usually upgrade my system a few months after a release so bugs like
this are identified and have plenty of time to be fixed before I
upgrade. I just upgraded from 13.04 to 13.10 and ran into this exact bug
(and currently stuck only being able to use two of my three monitors).
It is unfortunate
All I know is that whatever the cause was, it was fixed in 3.12 even in
the rcs. I have no idea what the actual fix was.
Kernel 3.11 end of lifed November last year. I also use btrfs for which
there have been maintenance patches in 3.12.
I followed the Kernel Build and Installation section at
You do know that no one knows what the fix is, only that it is in 3.12?
You can see that Timo gave up trying to find it in mid-November. If
Ubuntu is actually going to figure out the fix and backport it, then go
for it. However I am extremely sceptical and had to devise my own
workaround.
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Roger Binns, thank you for taking the time to report this bug and
helping to make Ubuntu better. However, I am closing it because as per
your comment https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-
video-intel/+bug/1242180/comments/28 the bug has been fixed in the
latest development
Roger Binns, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue? If
so, could you please test for this with the latest development release
of Ubuntu? ISO images are available from http://cdimage.ubuntu.com
Kernel 3.12 even in the prereleases fixed this.
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Title:
saucy regression - three monitors no longer work
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Roger Binns, thank you for your comment. Would you need a backport to a
release prior to Trusty, or may this be closed as Status Invalid?
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Title:
It isn't invalid. This is a very real issue affecting the existing
Ubuntu release.
I have been personally compiling 3.12 kernels from kernel.org as a
workaround that works for me, so I don't need anything.
I'd suggest closing as Won't Fix since Ubuntu won't provide a fix.
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Roger Binns, thank you for your comment. Of course you are mistaken in
your presumption that a fix wouldn't be provided, as it hasn't even been
submitted to the SRU process for evaluation as outlined in
https://wiki.ubuntu.com/StableReleaseUpdates . Despite this, as Trusty
is re-based on the
If Ubuntu would actually backport the 3.12 kernel to Saucy then go for
it. The kernel team PPA does not do 3.12 for saucy. At a minimum
3.12.6 is needed due to lots of btrfs fixes.
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Roger Binns, thank you for your comments. The scope of this bug report
isn't the entire 3.12.x series kernel. It is only the issue noted in the
Bug Title three monitors no longer work. So, staying focused on this
report, and it's scope, would you like a backport of the fix to this bug
report?
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Can you point me to other builds you want me to try, ideally as ppa
links like the above?
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Title:
saucy regression - three monitors no longer
ok, maybe try an earlier 3.12-rc if the final is somehow broken?
** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Timo Aaltonen (tjaalton)
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I'm confused as to what the goal is. The drm-intel-nightly works.
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Title:
saucy regression - three monitors no longer work
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because of
:: tjaalton@eldon:~/src/kernel/linux.git (master) git log1
v3.11..i915/drm-intel-next drivers/gpu/drm/i915|wc -l
754
it would be nice to know where it got fixed.. drm-intel-next is
basically what'll end up in 3.13-rc1. If you are willing to bisect the
diff then fine, but I'd like to
This didn't work:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11.7-saucy/
This did:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc1-saucy/
It would be ideal if you gave me a list of urls like above in preferred
testing order
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Nice, so we're down to 354 commits, which is a start..
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Title:
saucy regression - three monitors no longer work
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so it's a kernel regression, marking as such
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
** Changed in: linux (Ubuntu)
Status: New = Confirmed
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and keeping the ddx entry open so that it's easier to find
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided = Medium
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New = Confirmed
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so, things to try:
- does 3.12 work
- if not, does drm-intel-nightly from the mainline ppa work
- if 3.12 works, maybe do a rough bisect through the 3.12-rc's from the ppa
if none of these work, then maybe doing a rough bisect to see which
kernel broke it. Likely some -rc1, where most new code
I installed 3.12 from http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.12-saucy/
It failed to boot. With normal boot there was no further progress after
ramdisk loading. In recovery mode the kernel said it failed to execute
/init but gave no further details.
I am now trying
The drm-nightly from previous comment works
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Title:
saucy regression - three monitors no longer work
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Booting the raring kernel (3.8.0-33) under saucy results in all 3
monitors working correctly.
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Title:
saucy regression - three monitors no
xrandr output running command line from comment 2. Raring:
crtc 0:1920x1200 60.0 +1920+0 DP2
crtc 1:1920x1080 60.0 +3840+0 HDMI1
crtc 2:1920x1080 60.0 +0+0 HDMI3
Saucy livecd:
xrandr: Configure crtc 2 failed
crtc 0:1920x1080 60.0 +3840+0 HDMI1
crtc 1:1920x1080
FYI, this is an easy way you can test the latest Xorg nightlies:
http://www.ubuntuupdates.org/ppa/xorg-edgers
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Title:
saucy regression - three
@RichardNeill - already did all that as mentioned in comment 4 which
also has the advantage of working on the livecd.
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Title:
saucy regression
** Attachment added: xorg log
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1242180/+attachment/3884152/+files/Xorg.0.log
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The failures to set occur using the graphical tool from system settings,
as well as the xrandr command line
xrandr --output DP2 --primary --auto --output HDMI3 --auto --left-of DP2
--output HDMI1 --auto --right-of DP2
** Attachment added: xrandr output
I also ran xorg-edgers-live-test as described in
https://wiki.ubuntu.com/XorgOnTheEdge and that didn't help. Restored
from my backup and everything works fine.
(xorg-edgers-live-test also needs updating - it tries to restart gdm
when it should be restarting lightdm)
** Attachment added: xrandr
** Attachment added: xorg log from raring where everything works fine
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1242180/+attachment/3884309/+files/Xorg.0.log
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