[Bug 47941] [snb] Backlight control broken between 3.6.0-rc1 and 3.6.0-rc4

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=47941

--- Comment #100 from Evan Callicoat <apsu at propter.net> ---
@Daniel I'm not sure what the right answer is necessarily. It's easy to say
"Boot in Legacy mode!" as the fix, but on an XPS 13 IVB FHD, Secure Boot
requires the pure UEFI mode; it's mutually exclusive with the Legacy Option
ROM/Legacy BIOS mode.

So, aside from the off-topic discussion of whether anyone cares about Secure
Boot, and given that this *used* to work in pure UEFI mode until a kernel
revision or two ago, I'm not sure the patch is right yet. The solution probably
requires gathering drm.debug information in both modes and comparing to find
out what the legacy ROM is telling the driver differently.

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