I recently updated my system to 12.04; it has two screens driven by an NVidia GeForce 8400GS graphics card. Xinerama is enabled. When I move the mouse left across screens, it jumps from left edge of one to left edge of the other. It does not do this in the reverse direction. This right-to-left behavior is really weird; left-to-right is okay.
More details:
* xorg.conf shows screen 0 is left, screen 1 is right, and Xinerama is enabled. (See below.)
* Moving the mouse on the desktop from screen 1 to 0 (i.e., to the left), it leaves the left edge of screen 1 and shows up on the left edge of screen 0; it does not glide across screen 0 to get there... unless I move across the edge at !very! slow speed; I can then pick up speed after crossing, and it behaves normally. (Yes, speed sensitive.)
* It does not do this when moving right (screen 0 to screen 1). In that case, it mouse glides across the desktop with no problem.
To add some confusion, running 'nvidia-settings', it talks about a single screen and two displays.
* X Screen 0 shows dimensions 2960x1050, and displays Dell 2005FPW (DFP-0) and Sharp LL-172C-B (CRT-1).
* GPU 0 shows:
- CRT-1 (Sharp) refresh rate (60.02 Hz), but no dimensions;
- DFP-0 (Dell) resolution 1680x1050 and refresh rate of 59.88 Hz, 'Full Force GPU Scaling', GPU Scaling Method: 'Stretched'. (But it looks fine to me.)
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.40 Thu Apr 5 21:37:00 PDT 2012
GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.tmp.unity.support.test.1:
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,move,resize,imgpng,regex,gnomecompat,snap,animation,vpswitch,unitymtgrabhandles,place,grid,wall,expo,workarounds,fade,scale,session,ezoom,unityshell]
CompositorRunning: None
Date: Fri Aug 10 22:16:34 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
nvidia-current, 295.40, 3.2.0-27-generic, x86_64: installed
nvidia-current, 295.40, 3.2.0-29-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
NVIDIA Corporation GT218 [GeForce 8400 GS] [10de:10c3] (rev a2) (prog-if 00 [VGA controller])
Subsystem: eVga.com. Corp. Device [3842:1302]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
JockeyStatus:
xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
ProcEnviron:
TERM=xterm
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=1f2bbac2-f259-4fe0-97e7-5e95995e52ad ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-nouveau
UnitySupportTest: Error: command ['/usr/lib/nux/unity_support_test', '-p', '-f'] failed with exit code 1: Error: no composite extension
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2009
dmi.bios.vendor: Intel Corp.
dmi.bios.version: KGIBX10J.86A.3878.2009.1028.1049
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DP55KG
dmi.board.vendor: Intel Corporation
dmi.board.version: AAE47218-404
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrKGIBX10J.86A.3878.2009.1028.1049:bd10/28/2009:svn:pn:pvr:rvnIntelCorporation:rnDP55KG:rvrAAE47218-404:cvn:ct2:cvr:
version.compiz: compiz 1:0.9.7.8-0ubuntu1.2
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
After a lot of manipulation, including switching to nouveau and back to nvidia a few times, the problem has now disappeared. Looking at the lastmod date on /etc/X11/xorg.conf, this should have occurred Aug-12 16:07 or later. But since I was under a crash deadline and lack of sleep, I wasn't able to analyze exactly what had happened.
I am attaching a couple of files to capture the state of the current working system:
* /etc/X11/xorg.conf as