I just downloaded and installed the Studio1569 video driver as noted above. This does make the birghtness control for f4 and f5 work properly. The latest dirves posted by Dell for 1558, as of 3/12/10 has 184.108.40.2068 A00, dated release of 1/11. The one that works is 220.127.116.116. Interesting last four digits- transposed??? Why hasn't Dell figured this out?? Thanks for the help.
Post note: I have received a replacement 1558 for the random/ fan shutdown issue which has plauged the 1558 model line and frustrated loyal Dell Customers. It will be interesting to see how that "replacement" laptop is configured with drivers and bios.
Thanks again, Glenn
I Updated bios to A08 for freezing and when laptop go to sleep and then wake up I can't Balance monitor brightness
and intel turbo boost Technology Driver : cannot start
Exactly the same circumstance for me. I updated the Bios to A08 to stop my freezing issues, and now I cannot balance the monitor brightness.
I am also not able to change the brightness in my monitor. i tried updating bios to A12 and it is not helping to resolve the issue.
You mentioned to update the driver. Which driver you are referring ? How to update the driver ? Appreciate your help.