Messages in this thread | | | Date | Thu, 21 Nov 2013 14:33:26 +0000 | From | Matthew Garrett <> | Subject | Re: [PATCH] video: backlight: Remove backlight sysfs uevent |
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On Thu, Nov 21, 2013 at 09:43:32AM -0200, Henrique de Moraes Holschuh wrote:
> With this patchset applied, as far as I can tell anything that used to be > uevent-driven by the backlight class will break: when a process changes the > backlight using sysfs, other processes will not be notified of the change > anymore. This patchset seems to break backlight uevent support in such a > way that basically renders the entire thing useless and you might as well > just remove uevent support entirely.
The uevent support was initially added to handle systems where pressing a hotkey generates an event (good) but the firmware automatically changes the brightness (bad). I have absolutely no idea why I added BACKLIGHT_UPDATE_SYSFS - BACKLIGHT_UPDATE_HOTKEY solves the problem I was trying to solve. I'm not aware of any userspace that relies on BACKLIGHT_UPDATE_SYSFS.
-- Matthew Garrett | mjg59@srcf.ucam.org
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