We have a use for a lot of Pis powering a monitoring wall where we have a whole lot of dashboards that we are monitoring.
This setup requires that our monitors invert their colours every 30 minutes or so, so that we minimise the burn-in on these monitors.
xcalib -d :0 -s0 -i -a works perfectly on a normal 32/64bit Linux machine, but even though there is an armhf port of xcalib, it doesn't seem to be doing anything on the Pis.
What could the problem be? Where do I need to start troubleshooting?
EDIT: According to the readme of xcalib: xcalib README
This program is intended for X11-Servers like XFree86 that come with XVidModeExtension
Tested, Raspbian Wheezy has this extension.
If you are experiencing problems with the X.org server because of missing XVidMode header files, search for the additional packages that are available for most distributions. Debian provides the headers by the package libxxf86vm-dev package.
Tested, those packages are installed.
I've tried manually loading an ICC profile using xcalib, even messing with the gammas, and xcalib just doesn't seem to do anything.
Any other ideas?