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4 Posts

12-31-2014

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Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2014-12-31, 21:56 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.

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268 Posts

09-04-2012

DE

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-01, 10:12 AM

The following might be a solution to solve your issue:

https://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/Disabling-Auto-Screen-brightness-on-Intel-HD-Graphics-Thinkpad/ta-p/736335

(you should disable the automatic brightness adjusting in the Intel GPU settings)

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12-31-2014

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-01, 16:02 PM

Thanks but that "Power Conservation Features (Automatic Display Brightness)" is not available in my W540 (Windows 7 Pro).

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758 Posts

04-13-2012

IS

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-01, 16:33 PM

Hello.

 

Try turning the Adaptive Brightness off in the Windows Power Manager.

 

Advanced Settings - Adaptive Brightness.

 

Which version of the Intel driver are you running?

ThinkPad P1 - i7-8750H/32GB // ThinkPad P70 - Xeon E3-1505M/64GB
ThinkPad W540 (20BG) - i7-4800MQ/32GB // ThinkPad W520 (4282-W4Q) - i7-2720QM/32GB
ThinkPad T450s (20BW) - i7-5600U/12GB // Yoga 900 - i7-6500U/8GB
ThinkPad T61 (7665-CTO) - T7700/4GB // ThinkPad T60p (8741-C2G) - T7400/4GB
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304 Posts

10-26-2010

US

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-01, 17:11 PM
I don't have this option either (Windows 8.1 pro). Changing the adaptive brightness setting doesn't bring it up either. I am on the latest driver on the Lenovo website.

W540: i7-4700mq, K2100m, 16 GB RAM, 500 GB Samsung 840 EVO
T510: i7-620m, NVS 3100m, 8 GB RAM, 500 GB Samsung 840 EVO
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599 Posts

02-24-2014

AF

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-12, 7:06 AM

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??

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9644 Posts

12-27-2009

CA

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Betreff: Thinkpad W540 display brightness keeps on changing (dim/bright) on Windows 7 Pro

2015-01-14, 4:16 AM

On my W520, the relevant registry keys are:

DCUserPreferencePolicy
PowerDcPolicy

They're found in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E968-E325-11CE-BFC1-08002BE10318}\0000\
(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.


W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
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