[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[stocchero]

Working on my Lenovo Ideapad U350.

lspci
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)


Needed both boot parameters, 

acpi_backlight=vendor && thinkpad_acpi.brightness_enable=0

added to /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor thinkpad_acpi.brightness_enable=0"
GRUB_CMDLINE_LINUX="acpi_backlight=vendor thinkpad_acpi.brightness_enable=0"

after that, sudo update-grub.

The gnome applet for the panel is not working, but the keys work
perfectly.

Thank you very much, Kamal.

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Screen brightness control fails on Dell Studio 1558
https://bugs.launchpad.net/bugs/568611
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