@kaxing
Can you add kernel parameter to grub without the workaround you found
and test the backlight function again?
Either "acpi_video=vendor" or "video.use_native_backlight=1"
** Changed in: linux-lts-trusty (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1354313
Title:
[Dell Inspiron 5721] Brightness control does not work with
12.04.5(with kernel 3.13)
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