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I installed the Ubuntu 14.04 on Asus Q502LA laptop. Most of the things work fine, but brightness control does not work.
First, everytime on reboot, the brightness resets to 100% brightness.
Second, the keys (Fn+F5 and Fn+F6) do not work either.

I tried pretty much all of the suggestions that I could find here. None of them worked.
Did anyone have any success with getting the Fn+ keys working again to control the brightness in 14.04?

Thanks,

Mudit Kapil
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JavaFan
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  • Run acpi_listen in a terminal and press both Fn+F5 and Fn+F6. What's the output? – kos Feb 24 '15 at 05:17
  • Thanks for the advise, #kos. I ran the listener . When pressing Fn+F5 and Fn+F6, there is no action from acpi_listen (ie the combo does not trigger an event) – JavaFan Feb 24 '15 at 05:22
  • Do the other Fn combos work correctly? – kos Feb 24 '15 at 05:27
  • yes, the other Fn keys work fine with an exception for the airplane mode (Fn+F2). The airplane mode light is always on even though I have wifi but that is another issue I believe. – JavaFan Feb 24 '15 at 05:34
  • Ok, are both asus_wmi and asus_nb_wmi modules loaded? You can check it with lsmod – kos Feb 24 '15 at 05:51
  • I will check that first thing tomorrow morning and give an update. Thanks! – JavaFan Feb 24 '15 at 06:10
  • I checked my machine and indeed both modules asus_wmi and asus_nb_wmi are loaded. What do I do next? – JavaFan Feb 24 '15 at 19:06
  • That's what i have on the topic, sorry :) i upvoted your question as i'm interested as well, since my wifi hotkey has the same issue – kos Feb 24 '15 at 19:47
  • For Asus laptops acpi_osi= boot parameter helps in many cases. – Pilot6 Jun 10 '17 at 13:40

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I am answering my own question... ... so at the end after all the sufferings and bumps I ended up switching to openSuse. Never looked at Ubuntu Unity again, since openSuse does not have any of the problems I have been facing with Unity.

It is my personal opinion, but I think Unity is still a raw meat, while openSuse is a sizzling pepper steak.

JavaFan
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