https://bugzilla.kernel.org/show_bug.cgi?id=70231
Bug ID: 70231
Summary: Resuming from system sleep the ACPI backlight settings
take over the native Intel video backlight
Product: ACPI
Version: 2.5
Kernel Version: 3.14-rc1
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 125071
--> https://bugzilla.kernel.org/attachment.cgi?id=125071&action=edit
Dmesg from the machine after resume
I'm using /sys/class/backlight/intel_backlight to tune the backlight brightness
on HP revolve 810 laptop. After resuming from system sleep the backlight seems
to get the ACPI video values and not the values in the Intel driver.
I typically use the backlight sysfs interface directly as I'm running DWM as my
window manager (there is no way to tune it from DWM). Switching to gnome seems
work but my guess is that it just picks the first backlight device and it
happens to be acpi_video0.
The patch I've been using to fix this is here:
http://lkml.indiana.edu/hypermail/linux/kernel/1402.0/00521.html
Which basically blacklists the ACPI driver so that I only have the native
intel_backlight.
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