Jack Ramsay, thank you for performing the requested test. Could you please advise if any of the following kernel parameters individually provide a WORKAROUND following https://help.ubuntu.com/community/BootOptions :
acpi_backlight=vendor
video.use_bios_initial_backlight=0
thinkpad-acpi.brightness_enable=1
Jack Ramsay, thank you for performing the requested test. Could you please advise if any of the following kernel parameters individually provide a WORKAROUND following https:/ /help.ubuntu. com/community/ BootOptions : vendor bios_initial_ backlight= 0 acpi.brightness _enable= 1
acpi_backlight=
video.use_
thinkpad-