Bug happens on ubuntu 19.10 on a dell 7520. Here's what the command
lspci -k | grep -iA2 VGA returns:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
Subsystem: Dell 3rd Gen Core processor Graphics Controller
Kernel driver in use: i915
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01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Chelsea LP [Radeon HD 7730M]
Subsystem: Dell Chelsea LP [Radeon HD 7730M]
Kernel driver in use: radeon
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https://bugs.launchpad.net/bugs/847001
Title:
Adjusting display brightness is very slow on several Dell laptops
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