Why does my monitor calibration disappear briefly after standby and then return?
Asked 9/26/2010
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I calibrated my laptop display with a Spyder3 Pro. After the screen blanks or the computer wakes from standby, the display looks calibrated for a second or two, then flickers and appears uncalibrated. After several more seconds, the Datacolor software reapplies the calibration profile.
Why does this happen after standby, and is there any way to stop Windows or the graphics system from temporarily dropping the calibration?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
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When you go into standby mode, the amount of power draw is very low, just enough to keep things in RAM. Anything else is shut off to eliminate power consumption and that may include your video card if it supports it (and it most likely does). So, what I think is happening is that when you wake the machine, the initial display is effectively what was in the video buffer at time of sleep, the device driver then kicks in and resets the display, then, finally, the calibration software kicks in and recalibrates the display.
I see the same effect on my machine, so it's not specific to the Spyder3 as I use the Pantone Huey Pro. So, I think it's the video, it's effectively been shut off, and so it's largely the same effect as when you reboot.
Originally by user472. Source · Licensed CC BY-SA 4.0
user472
15y ago
0
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This is usually normal behavior after standby/sleep. In low-power standby, much of the hardware is powered down to save energy, and that can include the graphics subsystem. When the laptop wakes, the screen may briefly show the old image buffer, then the graphics driver reinitializes the display, which can reset the video LUT/display settings. After that, your calibration software loads the calibration again.
So the brief shift you see is likely the order of wake-up:
- old screen image appears,
- graphics driver resets the display,
- calibration software reapplies the profile.
It’s not specific to Spyder3; similar behavior can happen with other calibrators too. In practice, it’s much like what happens during a reboot. There may not be a complete way to prevent it if the video hardware/driver is being reset during wake, other than relying on the calibration loader to reapply the profile as quickly as possible.
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