[Bug 75917] backlight switches off when starting X - since kernel-3.13

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75917

--- Comment #3 from Alex Deucher <agd5f at yahoo.com> ---
Does disabling runpm help?  Boot with radeon.runpm=0 on the kernel command line
in grub.

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