Support in other languages: 
Showing results for 
Search instead for 
Do you mean 

Welcome to the Forums!

Welcome to Lenovo's Peer-to-Peer Discussion Community!
Please note our guidelines. How to register and login and Community FAQs.

Help Lenovo Shape the Future of PCs

Take the ownership survey. Share your ideas with our product team

Community Spotlight

Visit the Community Blog

Are you ready for Windows 10?

Get to know Windows 10
Visit the Windows 10 Support Center

Display contrast reduced while on battery mode on ThinkPad X220

0 Kudos
Helpful?
Click ►
Started ‎09-26-2011 by
Modified ‎09-26-2011 by
(1,995 Views)

Display contrast reduced while on battery mode on ThinkPad X220

Question

 

When my ThinkPad X220 desktop background is black and no windows are opened (only the taskbar is shown), the screen appears to switch to a reduced display quality.  The effect looks like a 256-color mode, raising the contrast to extreme levels so that colors of the taskbar look and all icons seem to be 'pixelated'.

 

When I then open a window, the screen needs up to 5 seconds to adjust.  Within these 5 seconds, some colors are not clearly shown and menus and window title bars look weird.

 

It slowly adjusts until it looks normal again.

 

This is reproducible with a black desktop background (I needed to switch to a colorful background image to prevent this), but also sometimes noticable when opening the lid after leaving it closed for a while (not in standby).

 

I use the latest drivers from the Lenovo website, all utilities are installed, and I haven't changed anything in the Intel graphics settings.

Answer

 

This is a normal power-conservation feature built into the Intel HD Graphics driver.  It can be disabled via the Intel Graphics Control Panel.

 

To disable it, right-click the desktop and select "Graphics Properties..." from the menu.  Within the Intel control panel, select the Power tab on the left side, then select 'On battery' in the top right corner of the Power Source area.  Finally, untick the checkbox next to "Display Power Saving Technology" to prevent contrast from being lowered.

 

intel_HDgraphics_power_settings.jpg




Comments
by acertain on ‎12-04-2011 10:55 AM

 

In case anybody comes across this and can't find the option.  On newer drivers, the Power tab is separated into "Power Plans" and "Power features."  This option is under the second sub-tab.

 

Andrew