While stating this - do you two use the same hardware? … 
That I don’t know which is why i stated he could have an issue with something in his system.
How can you state such a thing, then?
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Where are the millions of others with the same issue?
Excuse me. Not on any Novidia myself, it sometimes isn’t so easy guessing the ins-and-outs of such “modern” systems. 
I am no Nvidia fan boy trust me I much prefer ATI now AMD. My laptop came with Nvidia which is the only reason I have it.
Honestly though neither of us is Helping the OP if we argue with each other. I would rather just try to help with the issue at hand. Which I unfortunately don’t seem to be able to do ATM.
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Same here. 
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I say we just go grab a beer and leave it to the pro’s 
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As always, troubleshooting is done by investigating system logs.
Since there is a difference between GPU boot modes, compare logs from succeeding and failing boots, looking for:
- backlight names in /sys/
- relevant journal messages
- backlight values (amdgpu had an issue)
Maybe test different kernel backlight values, and reviewing logs.
When it is a system hw/sw singularity, it needs investigation by the user. Remote friends can only suggest things 
.
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Gooble gobble.
The production branch of nvidia drivers fixes the backlight issues.
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