12-31-2014 01:56 PM
My W540 (Windows 7 Pro) display intensity keeps on changing every 3-5 seconds. I tried to change the Power Setting "DIM THE DISPLAY" to Never for both On Battery and Plugged-in options but nothing happened. How can I disable the auto/dynamic brightness? It is really annoying. Thanks in advance.
01-01-2015 02:12 AM
The following might be a solution to solve your issue:
(you should disable the automatic brightness adjusting in the Intel GPU settings)
01-01-2015 08:33 AM
Try turning the Adaptive Brightness off in the Windows Power Manager.
Which version of the Intel driver are you running?
01-01-2015 09:11 AM
01-11-2015 11:06 PM - edited 01-11-2015 11:07 PM
I had this very same issue on my new (about 2 weeks old) W540. The power supply was bad. There is no blue light on the plug, nor a red or green LED on the power supply a.k.a., brick (part of the black box concept).
Are you getting clean power into the power brick? About 2-3 years ago I had a similar issue with another vendor's brick in a 220v country, but the diagnostic was easy. The LED would waver on the power brick. The issue was bad voltage input from the mains and the 'brick'. Most likely the brick was trying to regulate to the correct voltage.
Lenovo chose wisely to keep you in the dark. We need a "W540 for Dummies" book. Hello Wiley? Do you hear us??
01-13-2015 08:16 PM
On my W520, the relevant registry keys are:
They're found in:
(The GUID may be different; look for the above two registry keys)
Disabling all three power saving options causes the last byte in DCUserPreferencePolicy to become 00, and the last byte in PowerDcPolicy to become 5C.
Intel's been removing options from their graphics control panel for a while for no good reason.