I was not able to open an upstream bug at bugzilla.kernel.org because
it is still offline.
It turns out that this laptop requires the 'samsung-laptop' platform
driver in order for backlight control to work. The driver contains a
whitelist of the DMI strings of models known to require this driver.
This laptop identifies itself thusly:
$ sudo dmidecode -s system-product-name
N150P
The attached patch adds this model to the whitelist which causes the
driver to load and work as expected. The boot parameter
"acpi_backlight=vendor" seems to have the same ultimate affect as this
patch but needs to be manually set.
I was not able to open an upstream bug at bugzilla.kernel.org because
it is still offline.
It turns out that this laptop requires the 'samsung-laptop' platform
driver in order for backlight control to work. The driver contains a
whitelist of the DMI strings of models known to require this driver.
This laptop identifies itself thusly:
$ sudo dmidecode -s system-product-name
N150P
The attached patch adds this model to the whitelist which causes the =vendor" seems to have the same ultimate affect as this
driver to load and work as expected. The boot parameter
"acpi_backlight
patch but needs to be manually set.
I have forwarded the patch upstream: /lkml.org/ lkml/2011/ 12/22/364 thread. gmane.org/ gmane.linux. drivers. platform. x86.devel/ 2808
https:/
and
http://