Lenovo e531 - Fn keys don't work properly

Question

Although Fn + F1, F2 or F3 work well (they stand for audio volume), Fn + F5 or F6 don't. They should make the brightness of a display more and less, but instead they just make the brightness 0 and 10 of 100 and nothing else.

Has anybody faced with the same problem? Have you solved it?

By the way, they work properly in Window, at least at Windows 8.

score 2 · Answer 1 · edited Apr 13 '17 at 12:24

2

I got the same problem under 12.04.3 amd64.

I found a post with a similar problem: 12.04 - How to control Brightness

There is a workaround described :

Login as root (or use sudo vim) and open "/etc/default/grub"

Change the line (line# 11 or near)

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and close
Execute grub-update
Reboot

With this the keys work properly but only the brightness bar has still the wrong behaviour.

edited Apr 13 '17 at 12:24

Community

1

answered Oct 02 '13 at 19:10

Johann

31

Sorry for my first post. Finally I found a workaround ... – Johann Oct 02 '13 at 20:28
Could you please link to and quote from the original post? – gertvdijk Oct 02 '13 at 22:30
I added the link to the other post. – Johann Oct 03 '13 at 08:18
sudo grub-update -- command not found – Alan Coromano Oct 03 '13 at 12:17
well, thank you, it works. 1) do you have any idea how to make the brightness bar show the right value? 2)do you know how can I turn off the display? there was a special key on my previous lenovo laptop, this one doesn't have it. – Alan Coromano Oct 03 '13 at 12:24
@AlanDert please accept the answer if it solved your initial problem. – guntbert Oct 03 '13 at 16:29
I'am afraid that I am not firm enough with the internals to answer the question with the brightness bar. I assume its a problem with a kernel driver or with an acpi profile. To switch off the screen either you can switch to suspend mode or wait until the idle timeout (in the power settings) power it off. – Johann Oct 09 '13 at 18:05

score 0 · Answer 2 · edited Mar 21 '15 at 16:34

0

I can confirm the Fn keys is working on my 14.04.1 thus, by upgrading from 13.04 through 13.10 to 14.04.1 and applying the HWE, your Fn keys will work.

ubuntu@ubuntu:~$ uname -a
Linux ubuntu 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

edited Mar 21 '15 at 16:34

fossfreedom

172,746

answered Mar 21 '15 at 15:59

Kelvin Ng

51
2

Lenovo e531 - Fn keys don't work properly

2 Answers2