--- Comment #9 from Victor Lemeshev ( ---
Okay, the dimness was due to NVIDIA graphic card not controlling backlight.

After adding `video.use_native_backlight=1` and setting `Option
"RegistryDwords" "EnableBrightnessControl=1"` in XOrg conf the brightness
restores after suspend.

So, given that ACPI errors go away with the patch and I found a way to fix
screen issues there is nothing else from my side on this bug.

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