Testing with 4.5-rc1 results:
/sys/class/backlight/acpi_video0/ appeared.
Brightness changes if i echo the value to
/sys/class/backlight/acpi_video0/brightness
Tracked it down to this kernel.org bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=108971
It seems to be exactly the same issue.
I've tested it on v4.4-wily and v4.4-rc8-wily. Same problem:
/sys/class/backlight/intel_backlight/brightness changes, but the actual
screen brightness doesn't.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
--
You received this bug
** Description changed:
Backlight control does not work, but there are entries in
/sys/class/backlight.
Laptop model: NP530U4E-K01RU
Video adapter: Intel HD graphics 4000
I've tried all the suggestions from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
kernel parameters
** Summary changed:
- No brightness control on Samsung NP530U4E-K10RU
+ No brightness control on Samsung NP530U4E-K01RU
** Description changed:
Backlight control does not work, but there are entries in
/sys/class/backlight.
- Laptop model is: NP530U4E-K10RU
+ Laptop model: NP530U4E-K01RU
Public bug reported:
Backlight control does not work, but there are entries in
/sys/class/backlight.
Laptop model is: NP530U4E-K10RU
Video adapter: Intel HD graphics 4000
I've tried all the suggestions from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
kernel parameters acpi_backlight=ven
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