Toshiba SATELLITE M300 - Manual (Page 210)

210 Hot Keys/TOSHIBA Cards
Hot key functions
5.375 x 8.375 ver 2.3
Zoom (Display resolution)
or
Fn +
[Space bar]
This TOSHIBA Card or hot key switches screen resolution.
Selecting this Card or pressing the hot key displays the
following options:
(Sample Image) Screen resolution options
Cycle through the screen resolutions, then select the desired
resolution.