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Questions tagged [backlight]

A backlight is a form of illumination used in liquid crystal displays (LCDs).

Kernel team backlight debugging page:

460 questions
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5 answers

Backlight can't be turn on in Acer Aspire 4736

When I booted up my newly installed Ubuntu 11.04, I discovered, to my dismay, that the backlight was off by default. The keyboard shortcut (which is Fn+F6 on my Acer Aspire 4736) for turning on the backlight doesn't seem to work. I have been trying…
Shubham
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Adjust backlight level according to environment

In the Ubuntu world,is there a tool that can adjust backlight level according to environmental light levels with the help of a front camera?
吴环宇
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0 answers

Laptop brightness resets on opening lid?

So I just installed Ubuntu 16.04 on my laptop(fresh install) and am having an issue I did not have in Ubuntu 15.10. So I have set the When the lid is closed to Do Nothing as I don't want my laptop to suspend or hibernate when I close the lid. I…
mayank budhwani
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1 answer

how to change ubuntu brightness?

i have repeatedly found it very difficult on desktops. echo 40 > /sys/class/backlight/ doesn't work as there are no backlight files. in laptop too sometimes there are not there but fn key works! so i from where does the fn key change backlight when…
doeydha
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0 answers

*ERROR* Cannot find a backlight controller

So I just updated my kernel version on Ubuntu 15.04 64bit to Kernel 4.1.6 latest mainline. Now every boot of my laptop, I got this error. starting version 219 _ ...screen blink... starting version 219 [ 15.450992 ] [drm:radeon_acpi_init [radeon]]…
RoldanLT
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2
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2 answers

How to fix backlight for Dell inspiron on ubuntu 12.0.4 LTS?

I work on a Dell Inspiron laptop. The backlight is not working on Ubuntu. Is there any known issues like this with Ubuntu on Dell machines? I've tried some solutions such as changing grub like the following sample but still it's not working. sudo…
Ima Vafaei
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1 answer

LCD backlight keys on Fujitsu Siemens Amilo Pro

I have a FS Amilo Pro V3505, which runs 12.04 fine, apart from an anomoly with the brightness. The function keys (Fn-F8 & Fn-F9) both control the LCD brightness as you would expect. However only the first key seems to register with the…
Mark Williams
  • 474
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1 answer

How can I permanently apply this workaround to get the backlight working on an eMachines E525?

There is a display bug that I've been trying to find information on for a while now involving the "eMachines E525 Notebook computer" and it's "backlight", when using Ubuntu, Xubuntu, Lubuntu, and Kubuntu 11.04-11.10. Every time my computer gos to…
David Yenor
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Backlight turned on on boot

I'm running Ubunut 16.04 on a lenovo x240. Evrytime at boot, or when my laptop wakes up my keyboard backlight is turned on. I would like to see it turned off. It's a very annoying problem.
Stefanski13
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1 answer

How to make a patched DSDT work in 12.04?

My Samsung R428 laptop can't adjust the backlight with Ubuntu 12.04. Under Mac OS X 10.8.2, I patched the DSDT file and solved the same problem. I did some search, well, it seems DSDT overriding is no longer suported by Ubuntu. How can I fix this…
tony
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1 answer

Backlight controle is not working

i recently updatet my laptop to ubuntu 15.04 and my backlightcontrole is not working with the fn keys i tried a few things but it did not worked out for me. hp pavilion dv6 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]…
pipo
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0
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1 answer

How can I keep my backlight from turning off on my Lenovo G50-30 laptop?

How would I keep the screen backlight from going out after a very short time? My laptop is the Lenovo G50-30 and this is causing me issues with this happening all the time. Could you please assist me with this? Thank you.
user378860
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1 answer

Backlight issue on dell xps

I just installed Ubuntu on my dell XPS and everything seems to work fine but the backlight that is constantly turn off. I've tried several options read through previous posts but none of those worked. I also tried to install Intel graphic drivers…
Pietro
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1 answer

Backlight flickers after lid close and switch to battery

Ubuntu 12.10 32bit with Fallback DE. I need to set to Classic for Citrix Receiver to work properly. When screens are maximized with Unity, the mouse is offset. I can close and re-open the lid if on AC power but on battery, the backlight starts to…
user133726
0
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0 answers

Backlight Keyboard Not working

I have a backlight Keyboard Banda k77. Recently I switched from Windows to Ubuntu 22 LTS version. In windows, when I press scroll lock button. The backlight would turn on and off. But after switching to Ubuntu, I realized that it's not working. I…
shoaib hossain
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