control: forwarded -1 https://bugs.freedesktop.org/show_bug.cgi?id=87286
control: tags -1 patch
control: tags -1 jessie
I filed a bug for the backlight control issue on freedesktop.org.
There are 2 possible solutions:
1.) Disable native backlight and return to use acpi, as it was in 3.14.
2.) Fix intel_backlight
I don't know which one the upstream solution will be, but I guess for
Jessie native backlight should just be disabled (which fixes both the
inital brightness level and the control issue). See attached patch.
The same is already done for other product classes in 3.16.7-ckt2-1. And
looking at the bugreports at freedesktop even more will be added to
"disable native backlight" in the next time.
So probably just wait for now to see if the patch gets applied and
backported upstream.
Greets
jre
commit ea05c0cd09531bc9834cd176f17d9b7da24cae5f
Author: jre-winesim <jre.wine...@gmail.com>
Date: Mon Dec 15 14:17:13 2014 +0100
disable native backlight
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f1e3496..24d7444 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -694,6 +694,15 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
},
},
+ {
+ /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
+ .callback = video_disable_native_backlight,
+ .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "900X3C/900X3D/900X3E/900X4C/900X4D"),
+ },
+ },
{}
};
