See commit 751109aad5834375ca9ed0dcfcd85a00cbf872b5. Setting
video.use_native_backlight=0 is a workaround because it makes
/sys/class/backlight/acpi_video0/brightness come back.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1341108
Title:
[Lenovo ThinkPad T510] Backlight brightness control regressed from
logarithmic scale to linear scale
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