Comment 8 for bug 1218547

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Surak (smkozasa) wrote : Re: Clevo W350ST brightness keys don't work on Kubuntu

I did a clean boot with Kubuntu Raring 13.04 64 bits Live DVD. The problem persists exactly the same:

The Fn keys change the value of

/sys/class/backlight/acpi_video0/brightness

but to change laptop internal screen brightness, it should be changing the value of

/sys/class/backlight/acpi_video0/brightness

When I changed this last one, the screen brightness changed accordingly.

So, I believe this is NOT a bumblebee issue and it seems to be happening only with the Haswell chipset, since I have not found any complains from users with older chipsets using bumblebee or not. After all, it still happens with a clean boot from the Live DVD.

Unfortunately, I have no idea what package should be handling this. Maybe KDE itself or LightDM?

Thanks in advance.