User manual

Table Of Contents
Before you contact Lenovo . . . . . . . . 65
Lenovo Customer Support Center . . . . . . 65
Purchase additional services. . . . . . . . . . 66
Appendix A. Important safety
information . . . . . . . . . . . . . . . 67
Appendix B. Accessibility and
ergonomic information . . . . . . . . 81
Appendix C. Supplemental information
about the Linux operating system . . . 85
Appendix D. Compliance
information . . . . . . . . . . . . . . . 87
Appendix E. Notices and
trademarks . . . . . . . . . . . . . . . 101
ii L390, L390 Yoga, S2 4th Gen, and S2 Yoga 4th Gen User Guide