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Lenovo L430 malfunction brightness control 13.04

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1391 / 2 Years ago, fri, february 25, 2022, 8:26:47

I use a Lenovo L430. Unfortunately after updating to 13.04 the brightness control does not work any more. Hitting Fn + F8/F9 the popup appears but it is changing only one step and the brightness remains the same. Hitting once more the control remains in its position.

How can I fix it?

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gliroopy

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answered 2 Years ago ippalogu · Accepted Answer

A bug report has already been filed: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098216

The latest kernels (3.8.20 and above) should have fixed the issue.

Workaround

Add to /etc/default/grub
in the variable "GRUB_CMDLINE_LINUX_DEFAULT": acpi_osi="!Windows 2012"

e.g:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="!Windows 2012""

Then run sudo update-grub and reboot.