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[Launchpad Bug Tracker <370597@xxxxxxxxxxxxxxxxxx>]

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Binary package hint: compiz

I am noticing a problem when I have Sync to VBlank enabled for
applications which involve OpenGL, particularly when in fullscreen. If
there is consistent fast scrolling action at the very top of the screen,
then screen tearing occurs there, a problem does not happen with
Metacity, so I have concluded this is a problem with Compiz - I am using
the non-free NVidia driver.

It happens on Wine applications as well as on native Linux applications
as well, such as Gens GS and Google Earth, but doesn't occur on Firefox
or Totem.

VSync to Blank is of course enabled on both the OpenGL section of NVidia
settings and in CompizConfig Settings Manager.

NVidia settings tell me that my LCD monitor is currently using a refresh
rate of 75.02Hz. Asking Compiz to detect the refresh rate causes Compiz
to jerk along. Setting it to 75Hz (my monitor's refresh rate) and above
causes the problem with screen tearing at the top of the screen. I did
note that this problem from memory did not occur on Gutsy and Hardy, but
occurs on Intrepid and Jaunty, which I am currently using.

What should happen:

No screen tearing occurs.

What happens instead:

Screen tearing occurs at the top of the screen during fast paced action
on fullscreen OpenGL applications.

Output of lspci | grep -i vga:
01:00.0 VGA compatible controller: nVidia Corporation GeForce 8800 GT (rev a2)

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
MachineType: System manufacturer System Product Name
NonfreeKernelModules: nvidia
Package: compiz 1:0.8.2-0ubuntu8.1
PackageArchitecture: all
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.30-020630rc3-generic root=UUID=3f23e463-0763-4534-b006-ec5880198328 ro vga=795 #GRUB_DISABLE_LINUX_UUID=true quiet quiet splash
ProcEnviron:
 LANG=C
 SHELL=/bin/bash
ProcVersionSignature: Error: [Errno 2] No such file or directory: '/proc/version_signature'
SourcePackage: compiz

** Affects: ubuntu-release-notes
     Importance: Undecided
         Status: Invalid

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug compiz fullscreen nvidia
-- 
Screen tearing at top of screen with VSync enabled on Compiz with fullscreen OpenGL programs
https://bugs.edge.launchpad.net/bugs/370597
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