Looks like the xf86-video-intel driver chooses the acpi_video0 driver
[ 5632.883] (II) intel(0): found backlight control interface
/sys/class/backlight/acpi_video0
I have impression that changing the xf86 driver to take the
intel_backlight it works better.
Rgds,
Chris
--- a/src/intel_display.c
+++ b/src/intel_display.c
@@ -126,9 +126,9 @@ static const char *backlight_interfaces[] = {
"fujitsu-laptop",
"sony",
"samsung",
+ "intel_backlight",
"acpi_video1", /* finally fallback to the generic acpi drivers */
"acpi_video0",
- "intel_backlight",
NULL,
};
/*
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https://bugs.launchpad.net/bugs/828296
Title:
[Latitude E6220/E6420] Brightness hotkeys are sluggish
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