ThinkPad laptop standby brightness reduced Solution

When you find that the laptop is restored from the standby mode, the screen brightness becomes low, even if you adjust the brightness, It is very low and the brightness is not normal. The solution is to unplug the power and re-plug the power to restore the brightness. Of course, I used to restart my computer.

However, sometimes it will not decrease. Why? You can do this experiment: In the standby mode, there are plug-in sources and no plug-in power points in the notebook, plug-in power stands for a, do not plug-in power stands for B. Recovery from the standby mode also has a power-in and no-power-in status. Power-In stands for 1, and power-in stands for 2. Now let's try A1, A2, B1, and B2 respectively. You can see which status combination will cause the brightness of the standby recovery screen to decrease.

A1: normal
A2: The brightness is reduced, but the original battery screen is also reduced, and the brightness is restored by plugging in the power supply.
B1: The brightness is very low, and the screen is almost invisible, even if it is adjusted to full brightness. At this time, unplug the power and re-plug the power to restore the brightness.
B2: The brightness is lower, but the brightness is much better than that of B1.

Now I have finally found the pattern of changing the brightness of some ThinkPad laptops in the win7 system. I still don't know why. However, it is good to be able to unplug the power supply to solve this problem.