The brightness issue was solved in my end with the latest proposed kernel
(7.0.0-31-generic). Here's the info of my system:
Kernel: Linux 7.0.0-31-generic
Architecture: x86-64
Hardware Vendor: Lenovo
Hardware Model: ThinkPad X250
Hardware SKU: LENOVO_MT_20CL_BU_Think_FM_ThinkPad X250
Firmware Version: N10ET63W (1.42 )
Firmware Date: Thu 2021-07-29
Firmware Age: 5y 3w 3d
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https://bugs.launchpad.net/bugs/2161309
Title:
Backlight regression
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