These are the keys that functions when held down with Fn key. Sometimes, these keys are disabled so you will not be able to use them. Such as, adjust brightness, turn wi-fi on/off. The fix for the issue is very simple:
First test it by pressing the Fn key and the function key such as (F6). Doesn’t work?
Troubleshoot the Flash card Settings:
1. Click Start and go to All Programs -> Toshiba -> Utilities.
2. Click on the “Restart Flash Card” option.
3. Locate settings for flash card settings, and make sure that the disable all function keys option is unchecked.
If this does not works, go to the Toshiba site https://support.dynabook.com/drivers to re-download Flash Card drivers. Once you are on the site, search for the drivers for your model. It is easy to do, and once you have them downloaded, run and install them.