BrightnessCtrl.docx
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BrightnessCtrl.docx
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BrightnessCtrl
Windows7BrightnessControlforIntegratedDisplays
January9,2009
Abstract
ThispaperprovidesinformationaboutintegrateddisplaybrightnesscontrolfortheWindows®familyofoperatingsystems.ItprovidesguidelinesforsystemmanufacturersandfirmwaredeveloperstoexposebrightnesscontrolinfrastructuretoWindows.ThenewbrightnesscontroluserexperiencesforWindows 7arediscussed.Additionally,thispaperprovidespowerpolicyconfigurationinformation,includingnewpoliciesfortheadaptivedisplaybrightnessfeatureandinformationonhowtoobservebrightnesscontrolchangesbyusingthePwrTestutility.
ThisinformationappliestotheWindows 7operatingsystem.
Referencesandresourcesdiscussedherearelistedattheendofthispaper.
Forthelatestinformation,see:
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DocumentHistory
Date
Change
January9,2009
Firstpublication
Contents
Introduction4
BrightnessControlUserExperiences4
PowerOptions5
WindowsMobilityCenter8
HardwareHotKeys8
BatteryMeterBrightnessWarnings9
BrightnessControlPlatformInfrastructure9
ACPI-BasedBrightnessControlInterface9
WDDMDriverDDIBrightnessControlInterface10
HotKeyIntegration11
FadingTransitions11
BrightnessControlPoliciesandActions12
DefaultDisplayBrightnessPolicies12
AdaptiveDisplayBrightnessPolicies12
AdvancedAdaptiveDisplayBrightnessPolicies13
BestPracticesforBrightnessControlPolicyConfiguration14
BestPracticesforSoftwareDevelopers15
IntegrationwithAmbientLightSensorDevices15
ValidationofPlatformBrightnessControl15
ThePwrTestMONITORScenario15
ObservationofBrightnessLevelChangeswiththeMONITORScenario16
CalltoAction18
Resources19
Introduction
Duringordinaryuse,theintegrateddisplayinmostportablecomputersisthegreatestconsumerofpower.Toreducepowerconsumptionandextendbatterylife,Windows®providesaninfrastructureforcontrollingthebrightnessofthedisplay.
Windows 7simplifiestheuserexperienceforbrightnesscontrolandconfiguration.BrightnesscontrolsareavailableintheWindowsMobilityCenter,theControlPanelPowerOptionsapplication,andhotkeysonthesystemkeyboard.Useradjustmentstothebrightnesslevelarenowappliedtothecurrentpowerpolicy,whichpreservestheuser’sbrightnessleveladjustmentacrosssleep,resume,shutdown,andrestarttransitions.Afteraperiodofuserinactivity,thedisplaybrightnessautomaticallydimstohelpextendbatterylife.
Windowssupportstwowaystointegratebrightnesscontrol:
WindowsDisplayDriverModel(WDDM)miniportdevicedriverinterfaces(DDIs)andAdvancedConfigurationandPowerInterface(ACPI)firmwarecontrolmethods.ACPIcontrolmethodsarethepreferredimplementationsolutionfornewplatforms.Theunderlyingbrightnesscontrolinfrastructureisconfiguredbyusingpowerpolicysettings.Systemmanufacturerscancustomizethesesettingsbasedonthetargetplatformsordisplaytechnologies.
SystemmanufacturersandfirmwaredevelopersshouldreviewthispaperfordetailsontheWindowsbrightnesscontrolinfrastructure,newuserexperiences,andpowerpolicyconfigurationdetailsfordisplaybrightness.
BrightnessControlUserExperiences
Windows 7improvesthebrightnesscontrolconfigurationuserexperiencebysimplifyingtheinteractionbetweenthevariousmethodstosetthedisplaybrightness.AdjustmentstothedisplaybrightnessthatausermakesthroughWindowsMobilityCenterorkeyboardhotkeysnowpersistacrosssystempower-statetransitions(standbyandresume).AusercanalsoeasilyadjustthedisplaybrightnesslevelbyusinganewslidercontrolintheControlPanelPowerOptionsapplication.IfthedisplaybrightnessissettoalevelthatisgreaterthanthedefaultdisplaybrightnessoftheOnbatterypolicyfortheactivepowerplan,awarningappearsinthebatterymetertoadvisetheuseroftheeffectofthedisplaybrightnesssettingonthebatterylifeofaportablecomputer.
PowerOptions
TheControlPanelPowerOptionsapplicationistheuser’sprimaryinteractionpointforsettingthedisplaybrightness.InWindows 7,aDisplaybrightnessadjustmentsliderisnowavailableatthebottomofPowerOptions,asshowninFigure 1.
Figure1.TheControlPanelPowerOptionsapplication
TheDisplaybrightnessadjustmentslidersetsthebrightnesslevelforthecurrentpowerplan.
SimilartoWindowsVista®,inWindows 7userscansetthedefaultbrightnessbothforwhenthecomputerisrunningOnbatteryandwhenitisPluggedinforeachpowerplan.ThisfunctionalityisavailableinPowerOptionsbyclickingChangeplansettingsforoneofthepowerplans.ThisdisplaystheEditplansettingspage,asshowninFigure 2.
Figure2.TheEditplansettingspageinPowerOptions
NewforWindows 7arecontrolstoconfigureadaptivedisplaybrightness.ThesecontrolssettheamountofidletimeafterwhichWindowsautomaticallyreducesthedisplaybrightnesstoalowerbrightnessleveltosavepower.ThesecontrolsareavailableintheAdvancedsettingsdialogbox,whichuserscanopenbyclickingtheChangeadvancedpowersettingslinkontheEditplansettingspage.TheadaptivedisplaybrightnesscontrolsareundertheDisplaynode,asshowninFigure 3.
Figure3.PowerOptionsAdvancedsettingsdialogbox
WindowsMobilityCenter
ForWindows 7,theDisplaybrightnesssliderremainsinWindowsMobilityCenter,asshowninFigure 4.UserscanaccessWindowsMobilityCenterfromthebatterymetericonshortcutmenuorbypressingtheÿ+Xshortcutkey.
Figure4.WindowsMobilityCenter
InearlierversionsofWindows,ifusersadjustedthedisplaybrightnessthroughtheWindowsMobilityCenter,thatsettingwasineffectonlyuntilthesystemchangeditspowersource(switchedbetweenrunningonbatteryandbeingpluggedin)oruntilthesystemchangeditspowerstate(sleeporrestart).ThisbehaviorisdifferentinWindows 7.IfusersadjustthedisplaybrightnessthroughWindowsMobilityCenter,thenewbrightnesslevelisappliedtothecurrentpowerpolicy.Therefore,whenthesystemsleeps,resumes,orrestarts,thedisplaycontinuestousethesamebrightnesslevelthattheuserset.
HardwareHotKeys
Manyportablecomputersincludehardwarebuttonsorhotkeysforchangingthedisplaybrightness.Typically,usersaccessthesehotkeysbypressingafunction(Fn)buttonincombinationwithanotherkeyonthekeyboard.
SimilartotheupdatetoWindowsMobilityCenter,iftheuseradjuststhedisplaybrightnessbyusinghotkeysinWindows 7,thenewbrightnesslevelisappliedtothecurrentpowerpolicy.Forexample,iftheuserchangesthedisplaybrightnessto80 percentbyusingthehotkeys,the80-percentsettingisstoredaseithertheOnbatteryorPluggedinbrightnesslevelvalueinthecurrentpowerplan,dependingonwhetherthesystemisrunningonbatteryorispluggedinatthetimethattheuserchangesthedisplaybrightness.
BatteryMeterBrightnessWarnings
InWindows 7,thebatterymeterdisplaysawarningifthesystemisoperatingonbatteryandthedisplaybrightnessissettoalevelthatisgreaterthanthedefaultdisplaybrightnessofthebatterypolicyfortheactivepowerplan,asshowninFigure 5.Thiswarninghelpsusersunderstandthatreducingthedisplaybrightnessisasimplesteptoextendthebatterylifeofaportablecomputer.
Figure5.Batterymeterbrightnesslevelwarning
Systemmanufacturerscanadjustthedefaultvaluesforthedisplaybrightnesspolicyfortheirsystemstotargetthemanydisplaytypesandb
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