Displaylink slow graphic performance on Ubuntu 14.04

[Igor Santos]

I'm currently trying to use an AOC e1649Fwu screen on my Ubuntu work box. It's a DisplayLink screen, and i'm using a slightly modified version of this script to have it on after it's plugged in: https://wiki.archlinux.org/index.php/DisplayLink/displaylink.sh

I've however found that performance (of my whole system) is severely degraded when using the screen. Within Windows, the device work really well, however the monitor connected via the adapter is a little bit slow (caused by USB 2.0 bandwidth?) - but whilst using Ubuntu with the adapter, my whole system is slow, and specifically in this machine, barely usable.

The performance issue is most noticeable with any Unity animations such as opening the launcher or dash, moving screens around.

Also, some graphic features are buggy / gone:
- auto-complete boxes of PHPStorm have disappeared - like if they had no content, there's only a line where they should be
- some Compiz plugins are not working, like the Enhanced Desktop Zoom - when I press win+scroll up to increase zoom, the cursor is gone but nothing is zoomed in. I have to win+scroll down to have the cursor back.
- also, sometimes I would see glitches in windows, like in Pidgin chat windows.

I've tried disabling window animations and Dash blur, but they didn't help much as there's still a lot of animations throughout the system.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Fri Nov 21 20:38:57 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 82Q35 Express Integrated Graphics Controller [8086:29b2] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell OptiPlex 755 [1028:0211]
   Subsystem: Dell OptiPlex 755 [1028:0211]
InstallationDate: Installed on 2014-11-18 (3 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. OptiPlex 755
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=14dc1602-50ab-4d72-9a2c-828ce45af7a9 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/04/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0WX729
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd08/04/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0WX729:rvr:cvnDellInc.:ct3:cvr:
dmi.product.name: OptiPlex 755
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri Nov 21 20:23:44 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 16474
 vendor DEL
xserver.version: 2:1.15.1-0ubuntu2.1

[penalvch (penalvch)]

Igor Santos, thank you for reporting this and helping make Ubuntu better. As per http://www.dell.com/support/home/us/en/04/product-support/product/optiplex-755/drivers an update to your BIOS is available (A22). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report.

Once the BIOS is updated, then please mark this report Status Confirmed.

Thank you for your understanding.

[Launchpad Janitor (janitor)]

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