I did the full reverse commit bisect and found out the commit that fixes
the issue is:
commit 0434848e444b31ea862743b720585c127b8114c2
Author: Adam Lee <adam....@canonical.com>
Date: Wed Jan 28 15:30:27 2015 -0500
Bluetooth: ath3k: workaround the compatibility issue with xHCI
controller
I have no idea why this BT driver change affects backlight, but I
checked twice, and I can confirm that with commit
9786567e45eee30e68af97926de96905e765e48d the display is indeed black
(i.e. the issue reported in this ticket manifests) and with
0434848e444b31ea862743b720585c127b8114c2 the display works again.
I looked into BIOS Setup to see if I could perhaps disable bluetooth
there to see if it changes anything, but there it no option to disable
bluetooth.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1472794
Title:
[Acer Aspire 5250] Black screen after upgrade to 3.19.0-22-generic
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