User Guide

Keyboard (for ThinkPad X390 only) . . . . . 56
Chapter 8. Help and support . . . . . 63
Frequently asked questions . . . . . . . . . . 63
Error messages . . . . . . . . . . . . . . . 64
Beep errors . . . . . . . . . . . . . . . . 65
Self-help resources . . . . . . . . . . . . . 66
Call Lenovo . . . . . . . . . . . . . . . . 67
Before you contact Lenovo . . . . . . . . 67
Lenovo Customer Support Center . . . . . . 68
Purchase additional services. . . . . . . . . . 69
Appendix A. Important safety
information . . . . . . . . . . . . . . . 71
Appendix B. Accessibility and ergonomic
information . . . . . . . . . . . . . . . 85
Appendix C. Supplemental
information about the Ubuntu operating
system . . . . . . . . . . . . . . . . . 89
Appendix D. Compliance
information . . . . . . . . . . . . . . . 91
Appendix E. Notices and
trademarks . . . . . . . . . . . . . . . 105
ii T490s and X390 User Guide