lkml.org 
[lkml]   [2013]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] video: backlight: Remove backlight sysfs uevent
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


\
 
 \ /
  Last update: 2013-11-21 16:41    [W:0.070 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site