I have had the same problem with my Satellite P-105, The screen brightness hot key (flash card) will display but it doesn't respond. All other hot keys seem to be working.
I purchased the laptop new in May 2007, I noticed the problem started about a year ago, probably after an automatic update was applied but not sure exactly when. I have unistalled/reinstalled Toshiba Flash Cards and updated the vid driver but no change. I also called Toshiba Tech Support, they would not give advise over the phone , suggested sending it to a repair center "probably a hardware problem". I didn't send it in because I don't think they really knew what to do about it. Just living with a dim screen :-(
I would be interested in hearing if anyone has any more info on this issue.
ps. Out of curiosity I used the Spybot S&D System Startup tab (Mode>Advanced Mode>Tools>System Startup) to unselect the loading of "TCrdMain.exe" at startup and after rebooting the F6/F7 screen brightness controls are working! It appears that other Fn keys are working as well.
Edited by layup, 29 January 2009 - 11:30 AM.