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E6420 Brightness control no longer works after upgrading from 10.12 to 10.12.4?


someitalian123
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For what ever reason the brightness control in the System Preferences no longer works. I think it may be related to these two previous issues that I posted about in the past

 

https://osxlatitude.com/index.php?/topic/9131-solved-e6420-monitor-sleep-turn-off-on-boot-fresh-install-of-el-capitan/

 

https://osxlatitude.com/index.php?/topic/9504-solved-black-screen-on-e6420-sierra-upgrade/

 

I am using the following DSDT because the one in Jake Lo's Sierra bootpack was not working despite me having updated to the same bios version that the bootpack is meant for, as discussed in the above threads.

 

https://osxlatitude.com/index.php?/topic/9131-solved-e6420-monitor-sleep-turn-off-on-boot-fresh-install-of-el-capitan/?p=61321

 

But that DSDT was patched back when I was on El Capitan, do I need a new freshly patched DSDT for Sierra? Also why does the LoRes DSDT in the Sierra bootpack not work for me? This has been an issue for me since El Captain, is there something different about my E6420's monitor? It uses the Intel HD 3000 with the max resolution of 1366x768.

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