[SRU][PRECISE & QUANTAL][PATCH] d627b62 i915: initialize CADL in opregion

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Fri Nov 23 14:38:22 UTC 2012

On Fri, Nov 23, 2012 at 05:20:21PM +0800, AceLan Kao wrote:
> BugLink: https://bugs.launchpad.net/bugs/806032
> d627b62 i915: initialize CADL in opregion
> Some BIOS will read the CADL field to check the current active display device.
> Without this patch, this field will be empty and then we can't control
> the brightness.
> This issue affects Clevo and ASUS laptops.

Nack, this can cause issues on Precise and Quantal probably, as
discussed on this thread (and pointed out on the freedesktop bug
comments mirrored on the LP bug):
there was this problem exposed by the change in i915, the patch only
got reapplied and went in 3.7. So unless it's figured out which and if
some changes are needed for Precise/Quantal to avoid the regression,
and if they are ok for the stables, I don't see a good thing applying

> Best regards,
> AceLan Kao.
> --
> Chia-Lin Kao(AceLan)
> http://blog.acelan.idv.tw/
> E-Mail: acelan.kaoATcanonical.com (s/AT/@/)


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