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jonathanmina
Paper Tape
Posts: 3
Registered: ‎12-31-2014
Views: 1,536
Message 1 of 7

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

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.

Guru
Posts: 259
Registered: ‎09-04-2012
Location: DE
Views: 1,506
Message 2 of 7

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

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-...

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

jonathanmina
Paper Tape
Posts: 3
Registered: ‎12-31-2014
Views: 1,491
Message 3 of 7

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

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

Guru
Posts: 760
Registered: ‎04-13-2012
Location: IS
Views: 1,487
Message 4 of 7

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

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
Shawn3090
802.11n
Posts: 276
Registered: ‎10-26-2010
Location: US
Views: 1,480
Message 5 of 7

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

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
Bauden
Token Ring
Posts: 524
Registered: ‎02-24-2014
Location: AF
Views: 1,417
Message 6 of 7

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

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??

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,380
Message 7 of 7

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

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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