https://bugzilla.kernel.org/show_bug.cgi?id=74421
Bug ID: 74421
Summary: Samsung N145P backlight broken on 3.14.1
Product: ACPI
Version: 2.5
Kernel Version: 3.14.1
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
dmi:
System Information
Manufacturer: SAMSUNG ELECTRONICS CO., LTD.
Product Name: N250P/N145P
Version: Not Applicable
video:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor
D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller (prog-if 00 [VGA
controller])
Subsystem: Samsung Electronics Co Ltd Device c08f
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at f0300000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 18d0 [size=8]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at f0000000 (32-bit, non-prefetchable) [size=1M]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Just upgraded kernel from 3.13.19->3.14.1 and found backlight stays on full -
and
function keys do nothing.
Investigating, using function keys _does_ increase/decrease brightness values
in:
/sys/class/backlight/samsung/brightness
but backlight always remains on full and ignores these values.
I also have:
/sys/class/backlight/intel_backlight/brightness
but that value mysteriously always remains set at 12421.
Backlight control works perfectly on all 3.13.* series, including latest
3.13.10
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