Verified with kernel parameter video.use_native_backlight=1 and 3.16 kernel
Both of them could make the brightness control back to work.
Thanks
** Changed in: hwe-next
Status: Incomplete => Fix Committed
** Changed in: hwe-next
Status: Fix Committed => Confirmed
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1393644
Title:
[Dell Inspiron 3531] Brightness control does not work on 14.04.1
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