Can't set brightness

Quick to answer questions about finding your way around Linux Mint as a new user.
Forum rules
There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions use the other forums in the support section.
Before you post read how to get help. Topics in this forum are automatically closed 6 months after creation.
Locked
Gratian

Can't set brightness

Post by Gratian »

I just bougth a new Acer E15-511 and I installed Linux Mint 17.1 Cinnamon and I can't change brightness on it. I have that applet for it and no matter how i move it brightness is always 100% . I tried with hotkeys as well (fn+) and the same , it apear how the light should be lower but in fact no change in happening. But before i installed , when i was still booting from USB this function was available among with other feature but those i managed to fix them. I tried different solution but non of them work. Sorry for my gramatical mistakes if were any.
Last edited by LockBot on Wed Dec 28, 2022 7:16 am, edited 1 time in total.
Reason: Topic automatically closed 6 months after creation. New replies are no longer allowed.
Top
BlackVeils

Re: Can't set brightness

Post by BlackVeils »

firstly, open the Terminal, and run these commands:

Code: Select all

inxi -Fxz

Code: Select all

ls /sys/class/backlight
post the results in a reply, inside code tags, by using the code button above the editor.
Top
Dans564

Re: Can't set brightness

Post by Dans564 »

For me this issue is usually solved by editing the grub config file to include "acpi_backlight=vendor". To do this open the config in the text editor of your choice (I'm using gedit):

Code: Select all

gksu gedit /etc/default/grub
Then add "acpi_vendor=backlight , as follows:

Code: Select all

GRUB_CMDLINE_LINUX_DEFAULT="splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
then update grub:

Code: Select all

sudo update-grub2
Finally reboot.
Top
Gratian

Re: Can't set brightness

Post by Gratian »

I've tried the method sugested by Dans564 and now i can set the brightness from the applet or from settings but now my Fn keys (left/right for brightness) don't work anymore so in response for BlackVeils this is what i get using those commands

Code: Select all

gratian@gratian-Aspire-E5-511 ~ $ inxi -Fxz
System:    Host: gratian-Aspire-E5-511 Kernel: 3.13.0-37-generic x86_64 (64 bit, gcc: 4.8.2) 
           Desktop: Gnome Distro: Linux Mint 17.1 Rebecca
Machine:   System: Acer (portable) product: Aspire E5-511 version: V1.06
           Mobo: Acer model: Aspire E5-511 version: V1.06 Bios: Acer version: V1.06 date: 09/25/2014
CPU:       Quad core Intel Celeron CPU N2940 (-MCP-) cache: 1024 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 14665.2 
           Clock Speeds: 1: 498.00 MHz 2: 498.00 MHz 3: 498.00 MHz 4: 1827.00 MHz
Graphics:  Card: Intel ValleyView Gen7 bus-ID: 00:02.0 
           X.Org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: 1366x768@60.0hz 
           GLX Renderer: Mesa DRI Intel Bay Trail GLX Version: 3.0 Mesa 10.1.3 Direct Rendering: Yes
Audio:     Card: Intel ValleyView High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture ver: k3.13.0-37-generic
Network:   Card-1: Broadcom BCM43142 802.11b/g/n driver: wl bus-ID: 02:00.0
           IF: wlan0 state: up mac: <filter>
           Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller 
           driver: r8169 ver: 2.3LK-NAPI port: 1000 bus-ID: 01:00.1
           IF: eth0 state: down mac: <filter>
Drives:    HDD Total Size: 500.1GB (6.0% used) 1: id: /dev/sda model: WDC_WD5000LPVX size: 500.1GB 
Partition: ID: / size: 455G used: 28G (7%) fs: ext4 ID: swap-1 size: 4.17GB used: 0.00GB (0%) fs: swap 
RAID:      No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 43.0C mobo: N/A 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 160 Uptime: 6 min Memory: 774.1/3839.9MB Runlevel: 2 Gcc sys: 4.8.2 Client: Shell inxi: 1.8.4 
gratian@gratian-Aspire-E5-511 ~ $ ls /sys/class/backlight
intel_backlight
Top
BlackVeils

Re: Can't set brightness

Post by BlackVeils »

it may take a few different tests, but try what the other person said, except instead of:

Code: Select all

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
do:

Code: Select all

GRUB_CMDLINE_LINUX="acpi_osi=Linux"
remember to update grub after:

Code: Select all

sudo update-grub
Top
Gratian

Re: Can't set brightness

Post by Gratian »

I've tried and the Fn key still don't work
Top
BlackVeils

Re: Can't set brightness

Post by BlackVeils »

when I use that kernel I have both of those parameters in the line, separated by a space, maybe try that.

here's a webpage that might also help:
https://sites.google.com/site/easylinux ... adjustable
Top
Locked

Return to “Beginner Questions”