ubuntu-x-swat team mailing list archive

[Mahendra Tallur <635724@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hi !

Ubuntu automatically generates an xorg.conf file when installing the
proprietary Nvidia drivers. It works very well overall, however, one
cannot get a smooth Compiz experience without addiing two options in
xorg.conf.

* Option "TripleBuffer" "True" : without this option, some effects like
the "scale" effect (like the OSX Exposé) are *very* jerky. Moreover it
might make things generally smoother at a cost of a little more delay in
games which is generally not visible (I personally never noticed it)

* Option "DynamicTwinView" "false" : this is sadly more annoying because
it would disable some important features of the Nvidia drivers. However,
I think it should be discussed with Nvidia, because this feature makes
the nvidia driver report a bad vertical frequency value, which renders
animations less smooth.

* Moroever, the "Sync to VBlank" setting in "nvidia settings" should
also be enabled by default.

(I also filled in a report about the default Compiz value).

All in all, getting a smooth Compiz (& OpenGL) experience with an nvidia
GPU implies changing 4 values... I think this is a major concern for
mainstream users... Because most of them will stay with the default
values and have jerky / torn animations. (in movies / games / compiz)

Cheers !

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: nvidia-current 256.53-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic-pae 2.6.35.4
Uname: Linux 2.6.35-20-generic-pae i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module  256.53  Fri Aug 27 21:03:42 PDT 2010
 GCC version:  gcc version 4.4.5 20100909 (prerelease) (Ubuntu/Linaro 4.4.4-14ubuntu1)
Architecture: i386
CurrentDmesg:
 [   11.776250] ata1.00: configured for UDMA/133
 [   11.776254] ata1: EH complete
 [   14.963059] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
 [   15.915077] EXT4-fs (sda3): re-mounted. Opts: commit=0
 [   22.116006] eth0: no IPv6 routers present
Date: Sat Sep 11 14:44:27 2010
DkmsStatus: nvidia-current, 256.53, 2.6.35-20-generic-pae, i686: installed
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100910)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-20-generic-pae root=UUID=b632dd94-9cc0-4762-9480-28b067d8d171 ro quiet splash
ProcEnviron:
 LANG=fr_FR.utf8
 SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers
dmi.bios.date: 03/30/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.40
dmi.board.name: P43DE
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.40:bd03/30/2009:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnP43DE:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
glxinfo: Error: [Errno 2] Aucun fichier ou dossier de ce type
system:
 distro:             Ubuntu
 codename:           maverick
 architecture:       i686
 kernel:             2.6.35-20-generic-pae

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


** Tags: apport-bug i386 maverick

-- 
Nvidia : default xorg.conf settings prevent smooth Compiz operation (jerky animation)
https://bugs.launchpad.net/bugs/635724
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