Adjust Brightness Button Not Working

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Colby DuLin

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Aug 3, 2024, 4:39:38 PM8/3/24

to haymiczane

ACPI is a power interface management standard which is implemented inoperating system kernels. By default Linux kernel uses an inbuiltdriver for keyboard keys, which is often non compatible with somekeyboards.

Hence, we specify the option acpi_backlight=vendor which tells thekernel to take precedence of vendor driver over kernel driver. Theoption acpi_osi=linux tells the kernel to enable inbuilt ACPIworkarounds for Linux drivers; which can be the case if the devicedriver has issues for Linux architecture.

My computer is a Lenovo Legion Y740-15I with a nvidia GeForce RTX 2060.I have tried all solutions available but none worked. One day by chance when I installed tensorflow I had to install CUDA Toolkit 11.0 and his compiler.

Obviously, you should run this with the package of your current boot kernel. If you are unsure, run uname -r to get the kernel name. Moreover, package names after dpkg-reconfigure auto-complete in my bash, but your settings may vary.

Note that Nvidia drivers on MacBook Air 3,2 have a whole set of other, unrelated issues, some specifically related to brightness control. In particular, you need to add X-related device option settings EnableBrightnessControl=1 as per Brightness not working after installing NVIDIA driver. Also, MacBook Air 3,2 by default may fail to boot usable graphics altogether in Nvidia drivers, which is fixed by setting certain PCI-E registers in grub as per Proprietary NVidia drivers with EFI on Mac, to prevent overheating. Both were applied before on my machine and remained active after the upgrade, so not related.

I had much easier solution. Somehow unintentionally I've disabled "Handle display brightness keys" option in Xfce Power Manager. When pressing the brightness keys, the notification popup was displayed but the brightness bar wasn't moving. I took quite a while before I realized this.

Open the "Ubuntu Mainline Kernel Installer" app. Select the latest Kernel version which is at the very top of the list and click the Install button. As of this writing, version 5.15.1 is the latest. Restart the computer and the brightness keys work.

This worked for me. Ubuntu's own brightness control and keyboard brightness control work. Even when I turn the computer off and on, the setting does not change. This is real brightness control. When I lowered the brightness in third party programs, the screen became slightly bluish.

As a reference, my GRUB_CMDLINE_LINUX_DEFAULT is set to be that of the original one, i.e. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". In addition, I installed the brightness-controller, but I'm not sure whether it helped me or not.

For a Lenovo Legion 5 with AMD Ryzen and Nvidia 1060Ti on Ubuntu 21.04 I tried multiple fixes listed by others in this thread (adding EnableBrightnessControl=1 in xorg.conf, updating kernel - yes, I was desperate, etc.), however that what helped was the following:

I have a similar problem on Ubuntu 22 (brightness slider doesn't change anything) and tried the proposed solution without success. So I tried to change acpi_backlight=video instead acpi_backlight=vendor (as other answer propose) and brightness slider start to work.

2 From all the options choose the latest one (the one that has the greater number) and you'll see that there are lots of the, some end in -server, others end in -open; what you have to do is choose the one that ends in nothing, for example, in the picture above I used the first one 'Using NVIDIA ... nvidia-driver-535 (propietary)' and then I clicked on apply changes, it made me restart and voila!

I recently bought my laptop and suddenly overnight, the display adjustment function keys (f2 & f3) stopped being able to adjust the display brightness. The keys still work for other functions and the other function keys still work like normal. I have tried all the tricks provided in other forums, like updating the drivers, but so far nothing has worked.

I've solved this on multiple 830 G5 and 840 G5 laptops. They are running Windows 10 Enterprise 64-bit with update 1803 installed. I have installed the latest BIOS, HP Hotkey Support, AND the HP Collaboration Keyboard. It seems that the brightness Fn keys will only work after installing the collaboration software.

I've got this LCD Monitor @ home that works but the "menu" button doesn't seem to be working. I need to be able to adjust the brightness, but how can I do that if I can't even get into the monitor's menu? Is there a software solution that I can use?

I also was suffering greatly from this problem - especially when external lighting was dim and the monitor would flashing powerful beams of light in my eyes. On computer with integrated intel graphics, you can use the Graphics Control Panel for brightness settings -

For the Fn + F5 (its F5 on my computer, might be different on yours) to change the brightness you have to have the Samsung "Easy Display Manager" installed. Check to see that the program is still installed. If its not installed goto the Samsung website look up the model of your computer and it will display all the software dowloads that were pre-installed on your model of PC, if you need to you can download the "Easy display manager" again, once installed reboot you system and Fn + F5 should work again.

I am not sure I fixed everything, but I am finally able to adjust my brightness. I used my model number, NP88OZ5E and went to the Samsung website. I downloaded SW update and used it to download a myriad of new drivers and updates. It took quite a while. I still can't use my Fn keys to adjust brightness (I am missing that "easy display manager" program you referred to and I can't figure out how to find it, though I looked), but it works now when I use the control panel to adjust brightness now.

Thanks for all the help with what I am sure is normally very basic stuff. I feel a little smarter now at least. If you have any more suggestions for me, I am happy to hear them. If not, then thanks again.

I have a Samsung N210 Plus laptop which developed the same problem you were having,no brightness control. This happened a few years ago. The LCD display was on full brightness all of the time, which made using it uncomfotable on my eyes. This appears to be an issue with Samsung. The problem started just after the guarantee had expired. I also tried all different ways to sort the problem out, nothing worked. I contacted Samsung and spent over half an hour on the telephone, with a technician. We got the brightness control working. Next time I switched on the laptop it had gone back to full brightness with no conrol. I stopped using the laptop until I found out about f.lux. This program auto adjusts the brightness, you can also manually adjust the brightness with ( Alt-PageUp or Alt-Page Down).

My problem was the same: all Fn buttons had worked fine, except brightness buttons. All the same I was not able to change the brightness in windows control panel (brightness adjustment was missing) and in samsung control center (nothing happened when moved the brightness adjustment).

Check programs that can "override" your screen. My problem was TeamViewer 13. Don't know how TeamViewer had been overriding brightness settings, but when I had deleted it, Fn-buttons for brightness were on.

Hey guys, just got my k70 in and its sweet but the colors for the brighness and windows key lock buttons aren't changing. Pretty sure I've seen videos where they do change. I can select them and change them in the lighting settings but nothing happens. They won't change on any profile either, even if imported from the forum. Any Ideas on how to fix it?

I had the same issue from new (out of the box), deleting all profiles didn't work for me. Instead, I right-clicked on the window lock/brightness button and selected "Clear". This enabled me to assign new colours using CUE.

Had the same issue. You inspired me to check lighting profiles already assigned. If you right-click in the lock button and click edit light. Then you can change the 'on' light colour and brightness. Save re-configuring the switch to turn off then its off.

I have the same problem for the last 5 months after the Big Sur update.My issue is that I can't adjust the brightness in anyway. The touchbar show the bar of the brightness but nothing changes, the brightness is always at maximum.I updated my OS 4 or 5 times and nothing changes.Machine info:MacBook Pro (13-inch, 2017, Four Thunderbolt 3 Ports)3,1 GHz Dual-Core Intel Core i5Intel Iris Plus Graphics 650 1536 MB

Same issue here on a 2017 Macbook Pro 13 inch 4 Thunderbolt 3 ports. had the problem in Big Sur and still have it in Monterey, downgrading to Catalina now hoping that helps. This has to be solved or recalled...I tried to reset NVRAM and SMC and all the fixes one can find online, nothing worked.

I connected my M2 Macbook Pro to studio display. usually i closed the Macbook pro and only use studio display as my monitor. Then i connected with a bluetooth keyboard with mac compatible function key on top such as volume control, keyboard back brightness control.

All other function seem working fine, I can control Studio display volume, control bluetooth keyboard brightness. So i find out the brightness control key only can control my macbook screen even i closed lid. im still able to control the brightness manually in setting.

The page you linked to doesn't describe anything about the brightness as far as I can tell. Why is this by design, its very strange that suddenly with this new and expensive Apple display the brightness keys on your Apple keyboard don't change the brightness...

Sometimes I can't help but roll my eyes at those folk in Cupertino ? Is it that they they think we're too dumb to even control our own screen brightness now? Or that they're so smart we'd never want to?