Lenovo T420i Technical Information download pdf (Page 47)

Powermanagement

Toreducepowerconsumption,thecomputerhasthreepowermanagementmodes:screenblank,sleep

(standbyinWindowsXP),andhibernation.

Screenblankmode

Ifthetimesetonthe“Turnoffmonitor”timerintheoperatingsystemexpires,theLCDbacklightturnsoff.

Toputthecomputerintoscreenblankmode,doasfollows:

1.PressFn+F3.Apanelforselectingapowerplan(inWindowsXP,powerscheme)appears.

2.SelectPoweroffdisplay(keepcurrentpowerplan)(inWindowsXP ,keepcurrentpowerscheme).

Toendscreenblankmodeandresumenormaloperation,pressanykey.

Sleep(standby)mode

Whenthecomputerenterssleep(standby)mode,thefollowingeventsoccurinadditiontowhatoccurs

inscreenblankmode:

•TheLCDispoweredoff.

•Theharddiskdriveispoweredoff.

•TheCPUstops.

Toentersleep(standby)mode,pressFn+F4.

Note:YoucanchangetheactionoftheFn+F4keycombinationbychangingthesettingsinPowerManager.

Incertaincircumstances,thecomputergoesintosleep(standby)modeautomatically:

•Ifa“suspendtime”hasbeensetonthetimer,andtheuserdoesnotdoanyoperationwiththekeyboard,

theTrackPoint,theharddisk,theparallelconnector,orthediskettedrivewithinthattime.

•Ifthebatteryindicatorblinksorange,indicatingthatthebatterypowerislow.

Note:Evenifyoudonotsetthelow-batteryalarm,thechargeindicatornotiesyouwhenthebatteryislow,

andthenthecomputerentersthepower-savingmodeautomatically.

Tocausethecomputertoreturnfromsleep(standby)modeandresumeoperation,dooneofthefollowing:

•PresstheFnkey.

•OpentheLCDcover.

•Turnonthepowerswitch.

Also,ineitherofthefollowingevents,thecomputerautomaticallyreturnsfromsleep(standby)modeand

resumesoperation:

•Theringindicator(RI)issignaledbyaserialdeviceoraPCCarddevice.

•Thetimesetontheresumetimerelapses.

Note:Thecomputerdoesnotacceptanyinputimmediatelyafteritenterssleep(standby)mode.Waita

fewsecondsbeforetakinganyactiontoreenteroperationmode.

Hibernationmode

Inhibernationmode,thefollowingoccurs:

•Thesystemstatus,RAM,VRAM,andsetupdataarestoredontheharddisk.

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Lenovo T420i Technical Information Page 47