Dual Screen Desktop Change Timing Error

Question

Hi,
First a short background to my question:
I have a MacPro with 2 x 30 inch cinema displays on which I want to change the desktop images at certain intervals: every 5 seconds, every minute, every five minutes etc. I want to enjoy the full benifits and visual beauty of having a large image split over two screens, See example here:
http://badtastic.com/temp/screens2.png
The images are of course split into 2 versions, a left & right version that are stored in correspondingly named "left" and "right" folders from which the right and left screen preferences access the images. Note the images are also named so that they left and right image are in the same order irrespective of folder.
For some unknown reason the internal timers for each desktop change / interval are no longer in sync which results in something looking like this:
http://badtastic.com/temp/screens.png
And now the question:
How does one reset or sync the timers in the desktop preferences so that the changing desktops sync up nicely again. Is there a script...a simple terminal command or trick?
Any help or input is highly appreciated.
Kind Regards / Badtastic
Message was edited by: Badtastic

Answer 1

some update last few weeks has broken xgamma (or x?) here  too.
In my case xf86-video-ati 6.12.99.git20091014-1 and xfwm4. I used to disable my notebook monitor with
xrandr --output LVDS --off
and then correct the gamma of my external monitor using:
xgamma -rgamma 0.95 -ggamma 0.99 -bgamma 1.18
Now if I issue the xgamma command before the xrandr command I get this output
[user1@dell-notebook ~]$ xgamma -rgamma 0.95 -ggamma 0.99 -bgamma 1.18
-> Red 1.000, Green 1.000, Blue 1.000
<- Red 0.950, Green 0.990, Blue 1.180
But nothing visually changes. If I issue xgamma *after* xrandr x even crashes, but not always. in Xorg.0.log
Backtrace:
0: /usr/bin/X (xorg_backtrace+0x28) [0x45b808]
1: /usr/bin/X (0x400000+0x62939) [0x462939]
2: /lib/libpthread.so.0 (0x7fb99ddb8000+0xee80) [0x7fb99ddc6e80]
3: /usr/bin/X (0x400000+0x13ea49) [0x53ea49]
4: /usr/bin/X (VidModeSetGamma+0x6b) [0x534deb]
5: /usr/lib/xorg/modules/extensions/libextmod.so (0x7fb99bf4d000+0x9431) [0x7fb99bf56431]
6: /usr/bin/X (0x400000+0x46684) [0x446684]
7: /usr/bin/X (0x400000+0x2205c) [0x42205c]
8: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7fb99d064b6d]
9: /usr/bin/X (0x400000+0x21c09) [0x421c09]
Segmentation fault at address 0x1b8
Last edited by rwd (2009-12-01 22:14:44)