This is actually a kernel bug where the PWM isn't saved. It affects the
specific display type in this machine. It's been fixed upstream
already, and was brought into Ubuntu 16.04 (See SRU
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1625932).
The Precision 5510 however ships with Ubuntu 14.04 + vivid HWE stack.
The vivid HWE stack does not contain the fix, which is why this issue is
happening.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: xorg (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: xorg (Ubuntu Vivid)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Vivid)
Importance: Undecided
Status: New
** Changed in: xorg (Ubuntu Xenial)
Status: New => Invalid
** Changed in: xorg (Ubuntu Vivid)
Status: New => Incomplete
** Changed in: xorg (Ubuntu Vivid)
Status: Incomplete => Invalid
** Changed in: xorg (Ubuntu)
Status: Confirmed => Invalid
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Released
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1646537
Title:
Backlight sometimes fails to resume from suspend & screen brightness
sometimes will not dim below 100%
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