With atiwinflash i have killed 2 times my bios :/ but with atiflash ( the DOS/FreeDOS tool ) it work like a charm.
Originally Posted by zhark
Just a word of warning, modifying the bios of a mobile card is more risky than what I did. If something goes wrong, you'll have to restore the bios blind (so make sure you make a thorough list of steps and keyboard commands that restore the original bios *before* you try anything risky).
Originally Posted by piete
What I did was create a freedos bootdisk (I used an old 128MB usb stick I had lying around). On the stick, I loaded a dos program that can backup/flash the bios of your graphics card (unfortunately, I don't recall the name - but it's pretty well known).
Once I had the usb stick working, I booted from it and backed up my bios.
I then booted to windows (used a VM running in VirtualBox, actually) and used RBE (Radeon Bios Editor) to modify my bios settings. What I did was lower the clocks of the idle power state - you may have to modify the clocks for the second power state instead.
Finally, I saved my modified bios to the usb stick, booted from it and flashed my card.
My advice is to take your time and make sure you know the capabilities of your card before flashing them permanently. Test thoroughly first (if necessary, install windows and use an over-/underclocking tool like ati tray tools to discover the limits of your card). M oreover, don't use the absolute limits for your card but rather try to leave some headroom (I clocked my HD4850 100MHz higher than the absolute lowest core clock, for example).
That's it more or less. Disclaimer: there is a very real chance that this process will brick your computer, without any way to recover. If you cannot afford to buy a new laptop, don't do this. That's all