[Bug 79813] [hsw bisected regression] Chromebook loses backlight control in 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79813

--- Comment #31 from damocles <damocles- at hotmail.com> ---
Comment on attachment 101879
  --> https://bugs.freedesktop.org/attachment.cgi?id=101879
dmidecode/product & lscpi/vga


kernel 3.13.x all works
kernel 3.14.x black screen at kernel boot time, but restored by init programs
kernel 3.15.x screen to full bright and not backlight

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