[PATCH v3] ACPI / video: Add systems that should favor native backlight interface

[Aaron Lu]

Hi Igor,

On 01/18/2014 09:54 PM, Igor Gnatenko wrote:
> From: Aaron Lu <aaron.lu at intel.com>
> 
> Some system's ACPI video backlight control interface is broken and the
> native backlight control interface should be used by default. This patch
> sets the use_native_backlight parameter to true for those systems so
> that video backlight control interface will not be created. To be
> specific, the ThinkPad T430s/X230/X1 Carbon, Lenovo Yoga 13, Dell
> Inspiron 7520, Acer Aspire 5733Z and HP ProBook 4340s are added here,
> if they appear in some other DMI table before, they are removed from there.
> 
> Note that the user specified kernel cmdline option will always have the
> highest priority, i.e. if use_native_backlight=0 is specified and the
> system is in the DMI table, the video module will not skip registering
> backlight interface for it.
> 
> Thinkpad T430s:
> Reported-by: Theodore Tso <tytso at mit.edu>
> Reported-and-tested-by: Peter Weber <bugs at ttyhoney.com>
> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=51231
> Thinkpad X230:
> Reported-and-tested-by: Igor Gnatenko <i.gnatenko.brain at gmail.com>
> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=51231
> ThinkPad X1 Carbon:
> Reported-and-tested-by: Igor Gnatenko <i.gnatenko.brain at gmail.com>
> Lenovo Yoga 13:
> Reported-by: Lennart Poettering <lennart at poettering.net>
> Reported-and-tested-by: Kevin Smith <thirdwiggin at gmail.com>
> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=63811
> Dell Inspiron 7520:
> Reported-by: Rinat Ibragimov <ibragimovrinat at mail.ru>
> Acer Aspire 5733Z:
> Reported-by: <sov.info at mail.ru>
> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=62941
> HP ProBook 4340s:
> Reported-and-tested-by: Vladimir Sherenkov <a_12300 at mail.ru>
> Reference: http://redmine.russianfedora.pro/issues/1258
> 
> Signed-off-by: Aaron Lu <aaron.lu at intel.com>
> Signed-off-by: Igor Gnatenko <i.gnatenko.brain at gmail.com>

Thanks for updating this patch.

In the meantime, I plan to make some small modifications to this patch
in next revision:
1 remove the win8 OSI check, I've seen win7 laptops that also needs to
  have only the GPU interface left and checking win8 doesn't make much
  sense now;
2 add more entries for laptops that appeared in bugzilla recently.