This problem affects only the new 1080p model of XPS13.
It was introduced in 3.8.0-18.28 by this fix for another regression, LP:
#1162026:
[ Kamal Mostafa ]
* SAUCE: (no-up) drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13
backlight
- LP: #1162026, #1163720
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
** Changed in: dell-sputnik
Status: New => Confirmed
** Changed in: dell-sputnik
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
** Summary changed:
- Display backlight stopped working after update
+ XPS13 backlight stopped working after update 3.8.0-18.28
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https://bugs.launchpad.net/bugs/1169376
Title:
XPS13 backlight stopped working after update 3.8.0-18.28
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