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Sierra on E7270 Brightness and Sleep not working properly


orbislacteus
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Finally gave up High Sierra and tried my luck with Sierra. It looks better, but Brightness and sleep do not work properly. Brightness Slider is there and keys work with karabiner. but ii can only switch between full brightness and no brightness (blank screen).

 

If the screen goes black on energy saving it hardly comes back again.

 

Debug Files attached.

debug_10956.zip

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There where different packages in there. tried all of them - didn't change something for the better.

 

Maybe I need a newer bios version. The System says i have 1.5.3.

The Dell Web Page says current version is 1.17.5

is there any way i can upgrade without windows?

Tried to test install windows on external drive, but that doesn't seem to be so easy.

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