User`s guide

Release 260 Graphics Drivers for Windows - Version 260.89 RN-W26089-02v01

Known Product Limitations

problemisgeometricstructuresthatincorrectlydisappearandre‐appearasthescene

shifts.

Poor Quality S-Video Output on Some TVs

NVIDIAdriversdifferentiateanS‐videoTVfromacompositeTVbysearchingfor75‐

Ohmloadsonthechrominanceandluminancelines.Ifthedriverdetectsonlyonesuch

load,itassumesthatithasacompositeTVanddrivesbothchromaandlumaontothat

line.Thisapproachallows

bothtypesofTVtodisplayincolor.

Unfortunately,someS‐videoTVsdonotapplythecorrectloadtobothlines,causingthe

drivertodetectanS‐videoTVasacomposite.Thedriver,inturn,sendsthelowerquality

signaltotheS‐videoTV.Toworkaround

thisproblem,usetheControlPaneltooverride

theAuto‐selectfeature.Thiscanbedonefollowingthesesteps:

1 IntheSettingstaboftheDisplayPropertiesControlPanel,clickAdvanced.

2 InthenViewtab,clickDeviceSettingsandclickSelectOutputDevice.

3 IntheDeviceSelectiontab,clicktheTVoption.

4 ChangetheVideooutputformattoS‐video.

AGP and PCI-E Programs May Hang With AMD K7 and K8

Processors

 Issue

Microsoft®Windows®2000andWindowsXPsystemsusingAMDK7andK8

processorscanhangwhenanAGPorPCI‐Eprogramisused.

 RootCause

ThereisaknownproblemwithMicrosoft®Windows®2000andWindowsXP

systemsusingAMDK7andK8CPUsthatresultsintheMicrosoftoperatingsystem

allocatingoverlapping4Mcachedpageswith4kwrite‐combinedpages.This

conditionresultsinundefinedbehavioranddatacorruption,andisexplicitly

disallowed

bytheAMDCPUmanual.

Thisproblemcanaffectanydevicedriverinthesystemthatallocateswrite‐combined

systemmemory,butisusuallymosteasilyreproducedwithgraphicsdriverssince

graphicsdriversgenerallymakeheavyuseofwrite‐combinedsystemmemoryfor

performancereasons.

 Resolution

Microsofthasaknowledgebasearticleontheissue,thetextofwhichisunfortunately

quiteoutdated.WhilethearticleonlymentionsWindows2000,AGP,andK7,boththe

rootcauseandresolutionalsoapplytoWindows2000orWindowsXP,AGPorPCI‐E,

andAMDK7orK8.

Thearticlecanbefoundathttp://support.microsoft.com/

?id=270715.