[Bug 97486] Backlight does not change when adjust it higher than 50% after S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97486

--- Comment #20 from Yuan Chao <yuanchao at gmail.com> ---
Regarding a long out-standing bug on Maabook Air 6,2 (2013), there is a similar
behavior on back light after S3. [Bug 67454] With the suggested test on Comment
10 to 14 here, I found that instead of SOUTH_CHICKEN1 reg., SOUTH_CHICKEN2 reg.
needs to be kept and restored. The output of 'lspci -nns 2' is 

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT
Integrated Graphics Controller [8086:0a26] (rev 09)

Would the proposed patch be extended and cover the issue on MBA? Thanks!

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