Mismatched corner in multi-monitor configuration

[Luke Scharf]

I'm running Gnome Shell with a stacked multi-monitor configuration. My (1366x768) laptop display is located under a larger (2048x1152) external display. I've set the external (top) monitor as the "primary" monitor that holds the dock and the menu bar.

In this configuration, the wallpaper is misaligned with the screen border. The wallpaper on the top screen is shifted down around 20-some pixels and shows up on the bottom screen.

I've attached a screenshot showing the issue, with a big red arrow to direct your attention the issue. (It's more subtle on the screenshot than it is on a live system.)

This issue doesn't seem to cause any functional problems.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.22.0-0ubuntu3
Uname: Linux 3.1.0-0301rc9-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Mon Oct 17 10:35:20 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.2, 3.0.0-12-generic, x86_64: installed
 virtualbox, 4.1.2, 3.1.0-0301rc9-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:0005]
MachineType: TOSHIBA PORTEGE R835
PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log'
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.1.0-0301rc9-generic root=UUID=d046bba5-6bff-42e7-ae6e-afcab4507acb ro quiet splash resume=UUID=7c62d4f9-0ff6-4fc6-9666-2f70193d0c45 vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/25/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 3.10
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: dmi:bvnTOSHIBA:bvrVersion3.10:bd08/25/2011:svnTOSHIBA:pnPORTEGER835:pvrPT324U-008003:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: PORTEGE R835
dmi.product.version: PT324U-008003
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
version.ia32-libs: ia32-libs 20090808ubuntu26
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Brendan_P (brendan-p)]

I'm seeing this with a left/config running the precise, ATI and open drivers.

Fine on boot if just using my laptop without a monitor and fine for the first time since reboot that I add a monitor. After a remove the monitor I have this miss-alignment and every-time I attach a monitor/TV thereafter.

Does not break anything, just annoying to look at.

[Brendan_P (brendan-p)]

Apologies for the double post. Just fixing my typo:

I have a left/right monitor config

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brendan_P (brendan-p)]

Not sure if this is related, if someone could let me know if need to open another bug.

After using a second screen, I have one persistent (extra, over and above the normal behaviour) desktop that will not "close" or cannot be removed.

I.e. so if I was only using one desktop, there would be the default additional "spare", but also this additional desktop that is only present after using a dual screen set-up and returning to single default screen (laptop).

[Brendan_P (brendan-p)]

Same behaviour with 3.9.92-0ubuntu1

Attached a couple screenshots.

I re-created the bug by doing a reboot with additional monitor connected.
Displays work as expected
Remove monitor
Run "displays"
Bingo (see first screenshot)
Adding back second display highlights issue in second screenshot (to follow).

[Brendan_P (brendan-p)]

2nd screenshot

[Brendan_P (brendan-p)]

Hi Folks,

Same behaviour still being displayed with latest package updates.

Cheers
Brendan

[Brendan_P (brendan-p)]

Is there anything I can do to help find a solution to this bug?

[Jeremy Bícha (jbicha)]

Brendan, I believe this is a duplicate of bug 964796.

[Brendan_P (brendan-p)]

OK thanks Jeremy. I'll keep track of that bug and see if the mutter update fixes this issue too.

Cheers
Brendan

[Brendan_P (brendan-p)]

Quick update on this.

Still present with 3.4.1-0ubuntu1

However I followed a tip from the bug report linked in #10 (https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/964796/comments/4)

Switching OFF "Have file manager handle desktop" fixes the issue.

So seems to be related to this feature, "Have file manager handle desktop".

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 11.10 (oneiric) reached end-of-life on May 9, 2013.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test.

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]