Problems with GPU switching, Computer is on | Lenovo U455 manual

Chapter 5. Troubleshooting

My screen goes blank while	• Your screen saver or power management may be
the computer is on.	enabled. Do one of the following to exit from the
	screen saver or to resume from sleep or hibernation
	mode:
	- Touch the touchpad.
	- Press any key on the keyboard.
	- Press the power button.
	- Press Fn+F2 to confirm whether the LCD screen
	has been turned off.

Problems with GPU switching

The system does not respond when I slide the GPU switch.

When I slide the GPU switch, a warning dialog box pops up.

•Make sure switchable graphics feature is enabled in BIOS setup utility.

•Make sure the driver for switchable graphics is properly installed.

•Make sure you are under Windows operating system when sliding the GPU switch.

•Close all running applications and try again. If you are performing GPU switch while a game application is running, quit the game and try again.

•If this happens when your computer is connected with an external display and the external display is active, switch the display device back to the LCD screen on your computer and then try again.

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Lenovo U455 manual Problems with GPU switching, Computer is on

Contents

Lenovo IdeaPad U455 First Edition December Copyright Lenovo Dear user Explanation of hard disk capacity Page Page Contents Contents Appendix B. Use and care Appendix F. FeaturesAppendix C. Lenovo limited 120 Important safety information Important safety information„ Read this first Iii Important safety information Unpack Important safety information Working place Important safety information Correct usage procedures Important safety information Vii Important safety information Service and upgrades Viii Getting to know your computer Power button Getting to know your computerIntegrated Camera Touchpad FingerprintReader Left-side view Adapter jack Right-side view Bottom view Battery pack Compartment Battery latchSIM card slot Select models only Memory „ Connecting to the power Installing the battery packConnecting the computer to an electrical outlet Learning the basics „ Configuring the operating system „ Turning on the computerLearning the basics Putting your computer into sleep state „ Shutting down your computer Using AC adapter and battery „ Checking battery status„ Charging the battery „ Removing the battery pack „ Handling the battery Using the touchpad Left click buttonRight click button „ Gestures Pinch zoomTwo-Finger Scrolling Rotating Learning the basics Three-Finger Flick Using the keyboard „ Numeric keypad „ Function key combinations Fn + Esc Fn + F1Fn + F2 Fn + F3 Connecting external devices „ Using memory cards not supplied „ Connecting a universal serial bus USB device „ Inserting a memory card„ Removing a memory card „ Connecting a Bluetooth device Select models only Enabling Bluetooth communications on your computer Switching GPU Select models only Learning the basics Special keys and buttons Volume buttons ~ Learning the basics OneKey Rescue system button System status indicators IndicatorTouchpad indicator Securing your computer „ Attaching a security lock not supplied „ Using VeriFace „ Using passwords „ Fingerprint reader Using the Internet Wired connection „ Software configuration Using the Internet„ Hardware connection Cable Wireless connection Wi-Fi „ Using Wi-Fi/WiMax Select models only Enabling wireless connectionSoftware configuration Hardware connection „ Using Mobile Broadband Select models only Inserting the SIM card Removing the SIM card Using the Internet OneKey Rescue system OneKey Rescue system„ Introduction OneKey Rescue system OneKey Rescue system Troubleshooting Frequently Asked Questions Troubleshooting Where are the recovery discs? What can I do if the backup process fails? Troubleshooting Display problems Problems with GPU switching Computer is on Troubleshooting Password problem Keyboard problemsSleep or hibernation problems Mode immediately after Troubleshooting Computer screen problems Sound problems Troubleshooting Battery problems Hard disk drive problemStartup problem Troubleshooting OneKey Rescue system problems Other problems Connected external Replacing the battery To replace the battery, do the followingUpgrading and replacing devices Upgrading and replacing devices Replacing the hard disk drive Handling a hard disk drive Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Replacing memory Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Appendix A. Getting help and service Appendix A. Getting help and service Getting help on the Web Appendix A. Getting help and service Appendix A. Getting help and service Getting help around the world „ Be careful about where and how you work Appendix B. Use and care informationCaring for your computer „ Notice of static-electricity Appendix B. Use and care information „ Be gentle with your computer „ Carry your computer properly „ For outdoor use „ Handle storage media and drives properly „ Data safety „ Take care in setting passwords„ Other important tips Appendix B. Use and care information Accessibility and comfort „ Ergonomic information „ What if you are traveling? „ Questions about vision? Maintenance „ General tips for maintenance Appendix B. Use and care information „ Cleaning the cover of your computer „ Cleaning your computer keyboard „ Cleaning your computer display Appendix C. Lenovo limited warranty „ What this warranty covers „ How to obtain warranty service „ What your service provider will do to correct problemsAppendix C. Lenovo limited warranty Information „ Replacement of a product or part „ Your additional responsibilities „ Use of personal information „ What this warranty does not cover „ Limitation of liability „ Dispute resolution „ Other rights „ European Economic Area EEA „ Lenovo Turkey address Lenovo Technology B.V. Turkiye Istanbul Subesi Warranty information „ Types of warranty service Customer Replaceable Unit CRU Service Appendix C. Lenovo limited warranty On-site Service Courier or Depot ServiceCustomer Carry-In or Mail-In Service Product Exchange Service Appendix D. Customer replaceable units CRUs Appendix D. Customer replaceable units CRUs Appendix E. Notices Appendix E. Notices „ Export classification notice 100 Energy Star model information 101 102 Windows Wireless related information „ Wireless interoperability103 „ Usage environment and your health 104 „ Safety information related to Mobile Broadband 105 106 Electronic emissions notices „ Federal Communications Commission FCC Statement107 „ Industry Canada Class B Emission Compliance Statement 108 „ Avis de conformité à la réglementation d’Industrie Canada „ German Class B Compliance Statement109 110 „ European Union Compliance Statement Class B Compliance 111 112 „ Japan Compliance Statement for Power line Harmonics „ Korea Class B113 Weee and recycling statements „ General recycling statement114 EU Weee statements 115 Japan recycling statements 116 „ Disposing of a Lenovo Computer Components 117 118 119 Appendix F. Features and Specifications 120Model Name IdeaPad U455 Form Factor Appendix F. Features and Specifications Ports 121Others Trademarks 122 Index 123 124 Index 125 Page Do not Return IT to the Store If your product is not working correctly New World. New Thinking.TM