[Bug 563100] Re: Mouse movement corrupted with Xinerama enabled

[Mackenzie Morgan]

** Description changed:

+ Impact:  mouse movements are incorrect when a display is placed to the left of or above the "primary" display (negative coordinates in use)
+ How the bug is addressed: revert to having signed ints representing coordinates on screens so that negative coordinates can be properly used
+ Patch: http://bugs.freedesktop.org/attachment.cgi?id=35383
+ Testcase: see original report
+ Regression potential:  no obvious regression potential
+ 
+ === Original report  ===
+ 
  Binary package hint: xorg
  
  The mouse is unusable on a second monitor using the nvidia drivers and
  Xinerama (Installed: 2:1.1-2).  Upon moving to the second screen, the
  mouse cursor movement is erratic (although it does respond vaguely to
  physical mouse movement).
  
  The problem was introduced with lucid (and continues in beta 2).  The
  mouse works as expected on the second screen in both intrepid and karmic
  with exact same xorg.conf and nvidia drivers.
  
  The problem appears even with only the minimal settings in xorg.conf to
  enable dual monitors.  The problem appears whether the second monitor is
  rotated or not rotated.  The problem does not occur with nvidia's
  TwinView implementation.
  
  The mouse and all other aspects of X work fine in lucid *without*
  Xinerama enabled.  Enabling Xinerama causes no problems except this one.
  The bug is not present in Debian unstable.
  
  The new bug of course forces one to use separate X servers when wishing
  to rotate only one monitor in a set -- a limitation that was not present
  in prior releases of Ubuntu or other distributions.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: xorg 1:7.5+5ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-20.30-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-20-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Wed Apr 14 09:15:52 2010
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100406)
  MachineType: Gigabyte Technology Co., Ltd. EP45-UD3P
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-20-generic root=/dev/mapper/vg0-root ro
  ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  PATH=(custom, no user)
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  Xrandr:
-  Error: command ['xrandr', '--verbose'] failed with exit code 1: Xlib:  extension "RANDR" missing on display ":0.1".
-  RandR extension missing
+  Error: command ['xrandr', '--verbose'] failed with exit code 1: Xlib:  extension "RANDR" missing on display ":0.1".
+  RandR extension missing
  dmi.bios.date: 04/16/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F9
  dmi.board.name: EP45-UD3P
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd04/16/2009:svnGigabyteTechnologyCo.,Ltd.:pnEP45-UD3P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnEP45-UD3P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: EP45-UD3P
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  glxinfo: Error: [Errno 2] No such file or directory
  system:
-  distro:             Ubuntu
-  codename:           lucid
-  architecture:       x86_64
-  kernel:             2.6.32-20-generic
+  distro:             Ubuntu
+  codename:           lucid
+  architecture:       x86_64
+  kernel:             2.6.32-20-generic

-- 
Mouse movement corrupted with Xinerama enabled
https://bugs.launchpad.net/bugs/563100
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