Toshiba PORTEGE X30-E User Manual page 129

Maximum brightness is only available when operating in AC power mode.
Screen dims when the computer is operated on battery power and you
might not be able to increase the brightness of the screen.
Wireless LAN
The transmission speed over the wireless LAN and the distance over which
wireless LAN can reach might vary depending on surrounding
electromagnetic environment, obstacles, access point design and
configuration, and client design and software/hardware configurations.
The actual transmission speed is lower than the theoretical maximum
speed.
Copy Protection
Applicable copy protection standards included in certain media may
prevent or limit recording or viewing of the media.
User's Manual 7-20