On the Asus X570VD laptop with AMD Ryzen 7 with Radeon Vega Mobile Gfx, if you use the brightness keys to reduce the screen brightness to the minimum level under GNOME, the display flickers disturbingly. This is reproducible under Ubuntu 18.04 with all updates applied (Linux 4.15). It's also reproducible with AMDGPU-PRO All-Open drivers installed on top. It's also reproducible under Linux 4.18.5. It's hard to capture on camera, but you can get some appreciation of the issue in this video: https://youtu.be/tCoA45TJlAk When the screen is in this state, the /sys/class/backlight/brightness file has value 1. If I manually adjust to value 2, the flicker goes away.
Created attachment 141305 [details] Asus X570ZD dmesg with debug params Typo above - product name is Asus X570ZD. Here is the dmesg log
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