On mar., 2013-09-17 at 17:23 +0800, Aaron Lu wrote: > v1 has the subject of "Rework ACPI video driver" and is posted here: > http://lkml.org/lkml/2013/9/9/74 > Since the objective is really to fix Win8 backlight issues, I changed > the subject in this version, sorry about that. > > This patchset has three patches, the first introduced a new API named > backlight_device_registered in backlight layer that can be used for > backlight interface provider module to check if a specific type > backlight > interface has been registered, see changelog for patch 1/3 for > details. > Then patch 2/3 does the cleanup to sepeate the backlight control and > event delivery functionality in the ACPI video module and patch 3/3 > solves some Win8 backlight control problems by avoiding register ACPI > video's backlight interface if: > 1 Kernel cmdline option acpi_backlight=video is not given; > 2 This is a Win8 system; > 3 Native backlight control interface exists. I've tested this on my x230 (using pure UEFI with CSM disabled). As far as I can tell, it works as I would expect: - brightness keys work in initramfs, in console after boot, in lightdm prompt and in Xfce (wether or not xfce4-power-manager is running). I don't have brightness notifications (from xfce4-power-manager) but I don't usually need them so I'm fine with that. Regards, -- Yves-Alexis
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