Screen dim after waking from sleep

Recently I have been finding that when I wake my laptop from sleep, the screen is set to minimum brightness, even though it was at maximum brightness when I put it to sleep. I've only been having this problem recently — before that I was using Windows 10 without running into this problem. It's an annoyance rather than a catastrophic malfunction, but it is starting to annoy me quite a lot. How can I get the machine to wake with the same brightness as when I put it to sleep?

I've got a Lenovo Yoga 710 with Intel Graphics (plus NVidia graphics as well).

It looks like I'm still on 1709. I'm not sure what changed. But it's changed again since I posted. When I posted, the login screen was dim and it stayed dim once I'd logged in. Now it brightens back up when I log in, which makes it a bit less annoying.

It's due to a Lenovo setting.

Open Lenovo Vantage, navigate to Hardware Settings > Audio/Visual, then turn off Dynamic Brightness Control.

iTechieGamer said:

It's due to a Lenovo setting.

Open Lenovo Vantage, navigate to Hardware Settings > Audio/Visual, then turn off Dynamic Brightness Control.

Perhaps - seems to be a Lenovo thing anyway - there is lots on reddit regarding 1803 and Lenovo.

It happened to me yesterday (Lenovo X201) but I don't have any Lenovo software installed - just a clean install of 1803 - and usual fixes (close/open lid, adaptive brightness) didn't work. I've clean installed every version of 8 and 10 on this laptop and it is the first time it happened to me although from my limited research the issue seems to date back to Windows 7 at least.

A simple reboot (without doing anything else) fixed it for me and I've not been able to make it go wrong again.

Some say setting sleep (Alt+F4) and then shutting lid before sleep state is completed will reproduce this error but so far I can't. It may be worth changing what closing the lid does to "nothing" and playing around.

I found it quite alarming initially tbh - I thought the screen backlight had broken or something (this laptop is 8 years old so quite likely to start falling apart).