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

[AceLan Kao]

Yes, you are right.
The CADL patch introduced another black screen issue and is not really
fixed until now.
https://bugassistant.libreoffice.org/show_bug.cgi?id=43577

I'll keep an eye on this issue and sort out all the related patches.

2012/11/23 Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>:
> 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):
> http://lists.freedesktop.org/archives/dri-devel/2012-June/024661.html
> 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
> this.
>
>>
>> Best regards,
>> AceLan Kao.
>>
>> --
>> Chia-Lin Kao(AceLan)
>> http://blog.acelan.idv.tw/
>> E-Mail: acelan.kaoATcanonical.com (s/AT/@/)
>
> --
> []'s
> Herton
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
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-- 
Chia-Lin Kao(AceLan)
http://blog.acelan.idv.tw/
E-Mail: acelan.kaoATcanonical.com (s/AT/@/)