Toshiba Satellite L30 (PSL33) - Manual (Page 142)

User’s Manual B-9
Display Controller and Modes
5. When the LCD (internal liquid crystal display) display mode is selected,
the Virtual (Virtual Screen) display mode can be set. However,
afterwards, it may not possible to change the screen resolution to more
than 1280 × 1024 pixels in Highest (32bit) mode (for example, when
you attempt to set the resolution to 1600 × 1200 using the Screen
resolution slide bar and then select Highest (32bit) mode from the Color
quality drop-down menu).
In these cases, perform the steps below:
First, use the Screen resolution slide bar to select the 1280 × 800
resolution, and then change the resolution to more than 1280 × 1024
and select Highest (32bit) from the Color quality drop-down menu.
Some models only support a maximum resolution of 1024 Ч 768.