[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 #102 from Evan Callicoat <apsu at propter.net> ---
@Kamal I'm not necessarily suggesting you revert what just helped lots of
folks. 

However, as I mentioned, the pure UEFI mode is the only mode available when
Secure Boot is enabled, and I imagine quite a few Dell XPS13 users (all the
non-DE purchasers at least) are replacing Windows 8 with Linux, meaning their
BIOS will have Secure Boot on by default. Therefore I disagree with your
statement that the majority aren't in the same boat as how I'd like to boot my
XPS.

There's another bug affecting the pure UEFI boot since 3.10.x,
https://bugzilla.kernel.org/show_bug.cgi?id=59841, which causes constant
display corruption upon KMS engaging, with it's own patch that's yet to go
upstream. As you can see towards the end of that bug report, some folks are now
getting hit by *this* patch, with a dark screen unable to be made brighter.

I submit that we need to have a better solution to discovering what the Legacy
ROM is providing that these patches (or lack thereof) are working with yet
breaking without.

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