So I restored windows 8.1 saved image to get my first windows 8.1 rebuild. As Intel video driver gets installed, kills control function and Dell Intel driver(Win7-8_64_15.28.14_3040_Dell_setup_ZPE) does not restore it. Format partition and 15 mins later, repeat of story. so regardless of any other drivers, Intel driver kills it and dell Intel video driver does not restore brightness control. As soon as windows found HD 3000 and installed driver, fn+brightness stopped working. This all according to Dell reinstall guides. I immediately installed chipset driver, rebooted, noticed that windows installed its generic Intel HD 3000 driver in the background(which broke brightness), and right away on the top, installed latest DELL Intel video driver and rebooted brightness control still broken. It popped brightness window and moved up and down, adjusting brightness. I was working fine using windows 8.1 native control. when windows 8.1 came up, I was always checking brightness. I created system image of what I already had rebuilt in windows 8.1, and did full clean re-install. I started doubting my install process, if I missed anything. Some posts suggested that it is critical to install drivers in order. I researched this topic, found some other reference to Windows 8 having the same issue. I made sure I had Dell Intell HD 3000 driver, Dell Nvidia driver and Dell feature pack installed. I tried with Dell feature pack and without it. Then eventually I noticed that LCD brightness does not work. Nvidia video driver crash seems to be gone too. I have 2 other windows 8 machines so my windows 8 experience was there and I am quite happy with everything in windows 8.1 I installed most critical programs and all was cool and working. All device manager entries were with no warnings, some drivers were found and some I installed from Dell site. As soon as I booted I installed Dell chipset driver, video drivers and other drivers. Windows 8.1 install was amazingly fast, 15 mins. I saved all my data and wiped out windows and recovery partitions, leaving dell system partition. When windows 8.1 became available via corporate, I got hold of it and decided to reinstall fresh. it mostly worked besides I was getting "Nvidia Kernel Mode Driver has stopped responding and has recovered issue" at times and I had no choice but to reboot to make it work again, that is for a while. I have been using Windows 7 on M6600 for a while. Thanks for any suggestion or advice you can provide.
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