Asus Laptop Brightness Too Low
Eduviges Gearlds
Well... after to much researching and testing (I'm a linux noob btw :P), I found that the Fn keys change the value of the file /sys/class/backlight/asus_laptop/brightness. But, to change correctly the brightness, the file /sys/class/backlight/intel_backlight/brightness must be changed.
I even created a script to change it through bash, works alright and stuff... i just type ./brightness 50, where 50 means the % of the maximum brightness... but i still miss my Fn keys, for God's sake!!
Then I tried to simply change the symlinks that redirects the folders (asus_laptop and intel_backlight are symlinks to very opposed directions), but not even sudo was capable to change these symlinks...
After I failed to activate the brightness button on my Asus laptop running vega8 graphic chip using methods above, I finally had it fix installing the proprietary AMD gpu linux driver 20.45. Apparently, the open source Mesa driver will not with the brightness button. And at this time of the writting, I have to downgrade my ubuntu kernel to 5.4 to work with AMD driver 20.45. Kernel 5.8 in ubuntu 20.04.2 seemed to have crippled many AMD and nVidia driver at this time.
The only effect setting acpi_backlight to native/vendor has is that the GUI stops recognizing the fact I'm pressing the fn keys and doesn't display the brightness icon with it's current level (as it thinks). Without these settings it shows the icon with its level but the real brightness stays at maximum.
The most funny part is that in BIOS and BIOS splash screen I can change the brightness using fn+f5 and fn+f6 without any problems but as soon as the Linux starts it sets the brightness to the maximum level and doesn't let to change anymore.
1a) Figure out which /dev/input/event* device is for your keyboard. (Look at /dev/input/by-id or /dev/input/by-path and follow the symlinks, look at demsg/syslog, or just test all of them). Run evtest on this device, and press the Fn brightness keys. Do you get key events? If yes, good. If no, it probably generates ACPI events, if it does generate events at all without special drivers.
If you can answer "yes" to all these questions, all that is needed is some program (e.g. your window manager, or whatever desktop you run) to react to the key events and change the brightness. If the answer is "no", it will get more difficult.
If the built-in keyboard on your laptop is experiencing abnormalities such as unresponsive keys, slow response when pressing keys, or issues with shortcut key functions, please refer to this article for troubleshooting steps. If you are using an external keyboard, please refer to this article: How to fix External Keyboard problems.
Updating software usually helps the system stability and optimization, so we recommend you check and often update to the latest version in your laptop. Here you can learn more about How to update BIOS:
Answer : The hotkeys driver and utility are different in different generations of ASUS laptops. Please follow the below steps in flow chart to find the correct driver and utility on the ASUS support site.
The laptop is ASUS FX503vd, I tried several versions of Linux kernels (currently running one is the 4.17.1), but still have not managed to make the keyboard backlight control keys work. After the system boot on, the backlight is always on. There are two function keys (reused the numerical keypad) which is to control the brightness of the backlight. In windows, I can adjust down its brightness until fully off. But pressing the same keys in Linux has no effect at all. My feeling is the kernel did not detected the corresponding WMI device
The impression I get from the comments is that the battery is simply not able to supply sufficient power to run all of the components within the laptop. Other components (e.g. HD, processor, etc) don't seem to be affected by the reduction in power, but the screen controller seems to be much more sensitive.
By reducing the overall power used (e.g. reducing screen brightness, or deactivating USB charging ports) it seems to be reducing the overall power requirements enough that the screen controller is able to get enough power so that it can function without flickering. I will try similar changes myself in the power settings and see if I can get my own laptop to work better. Thanks everyone for all the comments!
this is my second laptop x541u because i asked them to replace the first one which is also flickering, now i had a new one and it is still flickering. is it the display driver or in the hardware? thank you!
I fixed it! I was the drivers. I installed a clean version of windows 10 as it installs Microsoft basic display driver. Problem solved except now I could not change brightness. After I started windows updated it found the correct driver from Intel. Installed and problem solved. Hope this helps. The drivers from manufacturers web site would not work at all.
Choosing Windows 10 balanced power plan under PC Settings.... System.... Power & Sleep.... Click on Additional power settings on the top right under Related settings... Choose Balanced (Recommended) and click on Change plan settings then set the brightness level on battery to 75% or below. Save settings.
Some people (like me) are not even running Windows and still see the issue. I am not saying that there aren't different causes for the screen flicker. Many laptops just have faulty hardware and no kind of software teak will ever fix it.
I had the same problem with the flickering screen when on battery. I replaced the battery and still the screen flickered. I followed Dirk's advice above and reduced brightness level to 70% and there is no more flickering. Thanks Dirk!
I fixed it! I was the drivers. I installed a clean version of windows 10 as it installs Microsoft basic display driver. Problem solved except now I could not change brightness. After I started windows updated it found the correct driver from Intel. Installed and problem solved. Hope this helps. The drivers from manufacturers web site would not work at all
My laptop model ASUS TP550L and same problem above comments. Replaced new battery pack which is cost me 60$ . Same problem, after replaced new battery. I think my laptop was happened after up-great Window 8 to Window 10. Window 10 may use more power consumption than window 8. Thanks to all
I have an X553M and my screen started flickering one year after I purchassed the laptop. I updated to windows 10 and still no solution. The flickering only happens when I unplug the laptop...te battery is fine, I even ordered a new motherboard and still no solution. I tried everything this and other groups have recommended and still no solution. I am convinced that it looks like a design issue or some sort of power management conflict. I don't like to hate on anyone but this is the second time I have issues with ASUS and their products...it is frustrating to have such a serious issue not being resolved by the manufacturer...ASUS, please look into this..not right having people that buy your laptops deal with something that makes the product essentially useseless...I could have purchased a desktop if I needed to keep it plugged in forever...just a shame
It does make sense though that replacing the LCD could solve the problem if the replacement has a less hungry backlight, presumably ASUS realised the problem and newer ones are "fixed"? The question is where to get a new LCD and how much would it be? My laptop is out of warranty so I can't see ASUS replacing it free of charge (even though its pretty clear that it's a design fault right from the start).
I have a Lenovo Yoga 2 Pro with the same problem. I had screen flicker when my battery was around 85%. Yesterday I updated my display driver to the one I found on Lenovo website. I have been using my laptop on battery since then and so far there is no flicker problem. I hope the problem is permanently fixed.
I decided to buy a 75 donor laptop off eBay that had a faulty motherboard, so I had all the parts available to me to correct the problem. After just a couple of minutes, I discovered it was a problem with the back light on the LCD panel and by replacing the LCD panel I was able to correct the problem.
I am going to try the suggested workaround above with the power plan settings, I hope it will work out because after 1 year of using this laptop having it always plugged in to power is pointless, If i cant move it around without power I'd rather get a desktop.
I've tested that too while diagnosing the first laptop, and it wasn't the problem. Poking at the cable seemed to make some difference in flicker but I believe it was just flexing the bad LCD power board or slightly varying the voltage to the LCD that has the problem.
So far 2 different ASUS 5xx series had faulty InnoLux LCD panels. Fixed both by replacing the LCD panel, $40 to $50 for a fix ain't that bad. Never touched the LCD cable at the motherboard on the 2nd laptop. Open your lid to remove the LCD, I bet you have an InnoLux LCD.
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