Comment 119 for bug 1386721

Matthew's fix only broke my display aspect ratio, forcing me to remove the
added file from a login console to restore normal functioning. Has anyone
else had any luck with it?

On Thu, 16 Apr 2015 21:35 Matthew Gillespie <email address hidden>
wrote:

> I can replicate the exact same issue that Celian demonstrates in his
> YouTube videos. In my instances, my Laptop (Lenovo T400) acts exactly
> the same way, however I have found the following:
>
> If I set modeset for my i915 video driver to 1 (or 0, which pulls the
> setting of DRM_I915_KMS=y from the kernel config), my framerate
> increases from 60fps to ~1000fps. This also fixes the sluggishness
> Celian and others have been complaining about, at least in my instance.
>
> Adding "options i915 modeset=0" to /etc/modprobe.d/i915-kms.conf may be
> of benefit to some users of the i915 module on this bug report.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1386721
>
> Title:
> Graphics Slow After Upgrade 14.04 - 14.10
>
> Status in Ubuntu GNOME:
> Confirmed
>
> Bug description:
> Using Gnome Ubuntu 14.10, Dell XPS 13, intel 915 Graphics
>
> After upgrading from 14.04 to 14.10 there are a lot of places where
> the graphics are working much slower than they were before:
>
> - Gnome Shell Interface is very sluggish, visible "chops" (redrawing)
> when pressing the [Super] key.
>
> - Selecting text in Gedit takes a full second pr. line
>
> Experiences some subjective improvement when I booted kernel 3.13.0-37
> instead of 3.16.0-23, but that may be my imagination as the problem
> persists.
>
> I've searched google, forums, found a couple of relevant links that
> point to the issue being the Intel drivers.
>
> http://askubuntu.com/questions/53962...E2%86%92-14-10
> http://www.webupd8.org/2014/10/ubunt...ent-1652086424
>
> But the drivers currently in 14.10 should be newer than those supplied
> by Intel to 14.04 so that doesn't make sense to me. As one Intel
> developer wrote:
>
> "I would like to point out that since what we do is bring more ecent
> versions of the software to the target distributions than they ship
> with, a 14.04 targeted installer is unlikely to bring much to a 14.10
> installation, which most likely has the same or more recent versions
> already anyway."
>
> Source: https://01.org/linuxgraphics/node/375
>
> ProblemType: Bug
> DistroRelease: Ubuntu 14.10
> Package: xorg 1:7.7+7ubuntu2
> ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
> Uname: Linux 3.16.0-23-generic x86_64
> ApportVersion: 2.14.7-0ubuntu8
> Architecture: amd64
> CompizPlugins: No value set for
> `/apps/compiz-1/general/screen0/options/active_plugins'
> CompositorRunning: None
> CurrentDesktop: GNOME
> Date: Tue Oct 28 15:24:30 2014
> DistUpgraded: 2014-10-25 20:59:36,052 DEBUG enabling apt cron job
> DistroCodename: utopic
> DistroVariant: ubuntu
> DkmsStatus: i915-3.15-3.13, 0.01, 3.13.0-37-generic, x86_64: installed
> ExtraDebuggingInterest: Yes, if not too technical
> GraphicsCard:
> Intel Corporation Haswell-ULT Integrated Graphics Controller
> [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
> Subsystem: Dell Device [1028:060a]
> InstallationDate: Installed on 2014-06-14 (135 days ago)
> InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64
> (20140416.2)
> MachineType: Dell Inc. XPS13 9333
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic
> root=UUID=105bbbd1-365e-4063-bdca-fc5431faf5dc ro quiet splash vt.handoff=7
> SourcePackage: xorg
> Symptom: display
> UpgradeStatus: Upgraded to utopic on 2014-10-25 (2 days ago)
> dmi.bios.date: 12/11/2013
> dmi.bios.vendor: Dell Inc.
> dmi.bios.version: A02
> dmi.board.name: 0GFTRT
> dmi.board.vendor: Dell Inc.
> dmi.board.version: A00
> dmi.chassis.type: 8
> dmi.chassis.vendor: Dell Inc.
> dmi.chassis.version: 0.1
> dmi.modalias:
> dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
> dmi.product.name: XPS13 9333
> dmi.sys.vendor: Dell Inc.
> version.compiz: compiz N/A
> version.ia32-libs: ia32-libs N/A
> version.libdrm2: libdrm2 2.4.56-1
> version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
> version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
> version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
> version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
> version.xserver-xorg-input-evdev: xserver-xorg-input-evdev
> 1:2.9.0-1ubuntu2
> version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
> version.xserver-xorg-video-intel: xserver-xorg-video-intel
> 2:2.99.914-1~exp1ubuntu4
> version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
> 1:1.0.11-1ubuntu2
> xserver.bootTime: Tue Oct 28 13:44:57 2014
> xserver.configfile: default
> xserver.errors:
>
> xserver.logfile: /var/log/Xorg.0.log
> xserver.outputs:
> product id 4933
> vendor CMN
> xserver.version: 2:1.16.0-1ubuntu1
>
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