hybrid-graphics-linux team mailing list archive

[Andres Martin <andres.mrtn@xxxxxxxxx>]

Hi all
I recently made a test of bumblebee (1.6.40) in a Dell XPS 15 L501 running
under Ubuntu 11.04. All worked Ok!

However, I tried optirun with matlab, to run some visual stimulus made
through Psychtoolbox 3, who needs deep acces to the hardware. It fail to
syncronize the presentation. Below is attached the output of the program. I
know is a very particualr usage of the hardware, but the very end of the
driver is that it would work in any context!!!!.
Good work (and thanks) for the peple who developed the bumblebee script!!!!.

*
Output from PTB3 Matlab 64bit*

PTB-INFO: This is Psychtoolbox-3 for GNU/Linux X11, under Matlab (Version
3.0.9 - Build date: Jun 19 2011).
PTB-INFO: Type 'PsychtoolboxVersion' for more detailed version information.
PTB-INFO: Most parts of the Psychtoolbox distribution are licensed to you
under terms of the MIT License, with
PTB-INFO: some restrictions. See file 'License.txt' in the Psychtoolbox root
folder for the exact licensing conditions.

PTB-INFO: Using GLEW version 1.5.3 for automatic detection of OpenGL
extensions...
PTB-WARNING: *Your graphics driver doesn't allow me to control syncing wrt.
vertical retrace!*
PTB-WARNING: Please update your display graphics driver as soon as possible
to fix this.
PTB-WARNING: Until then, you can manually enable syncing to VBL somehow in a
manner that is
PTB-WARNING: dependent on the type of gfx-card and driver. Google is your
friend...
PTB-INFO: Intel Corporation - Core Processor Integrated Graphics Controller
GPU found. Trying to establish low-level access...
PTB-INFO: Connected to Intel Core Processor Integrated Graphics Controller
GPU. Beamposition timestamping enabled.


PTB-DEBUG: Unknown NVidia chipset 0xffffffff


PTB-INFO: OpenGL-Renderer is NVIDIA Corporation :: GeForce GT 420M/PCI/SSE2
:: 4.1.0 NVIDIA 270.41.06
PTB-INFO: VBL startline = 768 , VBL Endline = 775
PTB-INFO: Measured monitor refresh interval from beamposition = 16.689836 ms
[59.916707 Hz].
PTB-INFO: Beamposition queries are supported, but disabled. Using basic
timestamping as fallback: Timestamps returned by Screen('Flip') will be less
robust and accurate.
PTB-INFO: Measured monitor refresh interval from VBLsync = 15.429087 ms
[64.812647 Hz]. (53 valid samples taken, stddev=2.035077 ms.)
PTB-INFO: Reported monitor refresh interval from operating system =
16.664722 ms [60.007000 Hz].
PTB-INFO: Small deviations between reported values are normal and no reason
to worry.

WARNING: Couldn't compute a reliable estimate of monitor refresh interval!
Trouble with VBL syncing?!?
----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ----
-- 
Andres