Yes, this beahaviour in W7 is areal PITA.
When a screensaver or a light sleep bumps in, the LUT load jumps out. There are some workaround mentioned by Windowspeople but these doesn’t work in real life.
The idea is that W7 should take care of the lutload for the systemprofile as this is default set in the colorprefs of the system. One can uncheck a box well hidden if stepping around in the tabs and pushing some “avance” buttons. This would disconnect the W7/VISTA managment of this and make the thirdpart calibration loader we use to take over. However the problems are the jump out - not the loading.
Getting it back into a videolut load is the harder part…
Hitting the lutloader in the startupfolder most often is dead end - nothing happens. There is some stuck stuff.
When using the workaround Patrick point at, sometimes the load works, sometimes not. At the same x-rite downplace, another little program is for free; the Calibration Tester.
The Calibration tester is a controller of the lutloading. It can load a new lut table which is not from an ICC profile. It can be a saved version in a textdokument. The program can also unload the current lutcurves from the display card. Resetbutton does that. That’s what we’re after now…
The funny thing is that when W7 drops the lutload, the calibration tester still shows the curves as loaded. Even the refresh button still doesnt show the dropout of the lutload. You have to hit the RESET button and then use the program Patrick mention. Now the profile can be loaded without the need to restart the whole thing without a computerreboot.
So, these two litte free programs are in a combo-workaround. Open them side by side if the Display profile on it’s own doesnt load the profile. Hit RESET in the calibrationtester to free upp whats ever is stuck under the hood…and hit then the profile in Dispalyprofile. You’re back in the ballpark.
This is really a crappy system. As far as I heard it was even worse in the VISTA system.
As long as the computer doesn’t get any sleeps or dialogs that darken the screen for a moment, the profile vcgt tag is loaded. On a monitor which in it’s native state is a clear bit off the spot, you notice the droput and can reload. On a monitor that is very well calibrated out of the box with clean greyramps, it is easy to miss the drop of the videolut curves. Photoshop uses the profile as a description of what is NOT loaded as calibration.
Anyway, these two programs makes the windos system behave the way macs always had in regards of videolut load/profileswitch from a list. Still Microsoft can’t solve it… more than in theory. Shame on you, Microsoft.