cc333 Posted February 11, 2018 Share Posted February 11, 2018 Hi, Just got an M6800 (excellent machine, by the way!), and I've successfully installed macOS Sierra on it. Other than built-in audio, everything seemed to be working okay under 10.12.0 (including the Expresscard slot). However, when I updated to 10.12.6, the brightness of the internal display seems to be stuck at 50%, and I can't change it. The brightness slider is useless, as it has only two positions: 50% on and 100% off). I installed the brightness fix bootpack for the m6800, but it hasn't helped. Switchable graphics is off, and the Graphics card is Nvidia K3100M. Any help would be greatly appreciated. Thanks! c 1 Link to comment Share on other sites More sharing options...
cc333 Posted February 12, 2018 Author Share Posted February 12, 2018 I figured it out! Apparently, all I had to do was install the AppleBacklight.kext and AppleBacklightExpert.kext from Sierra 10.12.0, and everything's working fine again! I have full brightness, and I can adjust it to any level at will. So, for anyone with this problem, rather than go through a bunch of rigamarole to patch your DSDTs and adding extra kexts that may or may not work, simply installing older versions of these two kexts appears to the problem quite nicely (at least with the Precision M6800; your mileage may vary with other models). c Link to comment Share on other sites More sharing options...
vanquybn Posted February 23, 2018 Share Posted February 23, 2018 Or you can use AppleBacklightInjector.kext to resolve it Link to comment Share on other sites More sharing options...
sabranivudu Posted March 18, 2018 Share Posted March 18, 2018 I too have an M6800 and I'm very happy with it, but for the life of me I am not able to run with hardware acceleration. I have an eDP display that seems the problem. Can you tell me what is your configuration? Thank you! Link to comment Share on other sites More sharing options...
JJDizz1L Posted April 19, 2018 Share Posted April 19, 2018 Try my thread. https://osxlatitude.com/topic/10582-dell-m6800-high-sierra-helpful-kext/ Link to comment Share on other sites More sharing options...
sabranivudu Posted April 25, 2018 Share Posted April 25, 2018 Thank you JJDizz1L, but I must point that you sent me to a high sierra thread with no trace of eDP display. Link to comment Share on other sites More sharing options...
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