Unable to change screen brightness - Mint 17.1 [Solved]

[su30mki117]

Hello,

I am unable to change screen brightness on my Lenovo Z570.

I tried the solutions 6.2, 6.3, 6.4 and 6.5 given in this link - https://sites.google.com/site/easylinux ... adjustable

Out of those only 6.5 works, but this solution is applied only at the software level, not hardware.

I didn't try 6.1 since my laptop has two video cards, and this doesn't work on laptops with two video cards.

Is there any solution out there that will work?

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System:    Host: MiGPilot Kernel: 3.13.0-37-generic x86_64 (64 bit) Desktop: Gnome Distro: Linux Mint 17.1 Rebecca
Machine:   System: LENOVO (portable) product: HuronRiver Platform version: Ideapad Z570
           Mobo: LENOVO model: Emerald Lake version: FAB1 Bios: LENOVO version: 45CN28WW date: 02/22/2011
CPU:       Dual core Intel Core i3-2310M CPU (-HT-MCP-) cache: 3072 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) 
           Clock Speeds: 1: 800.00 MHz 2: 2100.00 MHz 3: 1200.00 MHz 4: 2100.00 MHz
Graphics:  Card-1: Intel 2nd Generation Core Processor Family Integrated Graphics Controller 
           Card-2: NVIDIA GF108M [GeForce GT 520M] 
           X.Org: 1.15.1 driver: nvidia Resolution: 1366x768@60.0hz 
           GLX Renderer: GeForce GT 520M/PCIe/SSE2 GLX Version: 4.4.0 NVIDIA 331.113
Audio:     Card-1: NVIDIA GF108 High Definition Audio Controller driver: snd_hda_intel Sound: ALSA ver: k3.13.0-37-generic
           Card-2: Intel 6 Series/C200 Series Chipset Family High Definition Audio Controller driver: snd_hda_intel
Network:   Card-1: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller driver: r8169 
           IF: eth0 state: down mac: f0:de:f1:4c:0c:76
           Card-2: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) driver: ath9k 
           IF: wlan0 state: up mac: 68:a3:c4:40:76:79
Drives:    HDD Total Size: 640.1GB (1.0% used) 1: id: /dev/sda model: TOSHIBA_MK6465GS size: 640.1GB 
Partition: ID: / size: 19G used: 5.2G (30%) fs: ext4 ID: /home size: 7.7G used: 729M (10%) fs: ext4 
           ID: swap-1 size: 3.00GB used: 0.00GB (0%) fs: swap 
RAID:      No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 49.0C mobo: 40.0C gpu: 43C 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 173 Uptime: 7 min Memory: 754.0/2856.8MB Client: Shell inxi: 1.8.4 

[Buzzsaw]

Post the output of this command:

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ls /sys/class/backlight

[su30mki117]

Post the output of this command:

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ls /sys/class/backlight

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acpi_video0  acpi_video1  intel_backlight

[Buzzsaw]

Each of those directories should contain a text file called 'brightness'. Changing the number in these files changes the brightness. You'll probably find that more than one of the 'brightness' files can be used change the brightness, but they might do it differently.

Follow the instructions in this post. The only difference between that and your situation is that you have an extra directory 'acpi_video1' because you have a second graphics card, so include 'acpi_video1' too.

[su30mki117]

Each of those directories should contain a text file called 'brightness'. Changing the number in these files changes the brightness. You'll probably find that more than one of the 'brightness' files can be used change the brightness, but they might do it differently.

Follow the instructions in this post. The only difference between that and your situation is that you have an extra directory 'acpi_video1' because you have a second graphics card, so include 'acpi_video1' too.

Thank you! I am able to change the brightness by chaning the 'brightness' file inside 'intel_backlight'.

Is it possible to alter the brightness using the hotkeys on my laptop? It's 'Fn + Up Arrow' to increase the brightness and 'Fn + Down Arrow' to decrease in my case.

Or is changing it manually each time the only option?

[Buzzsaw]

Try doing section 6.1 of that page you originally looked at. It might work for you because it mentions the 'intel_backlight' directory. I don't think there are any other things you can try that aren't on that page.

[su30mki117]

Try doing section 6.1 of that page you originally looked at. It might work for you because it mentions the 'intel_backlight' directory. I don't think there are any other things you can try that aren't on that page.

6.1 did not work.

I am happy that I am atleast able to change the brightness in some way. This problem was really frustrating as the brightness used to be maximum all the time.

Thanks for your help.

[EuroStoxx]

I'm also unable to change brightness.
Any updates on this issue?

[zeyjam106]

Use Mate edition in both Ubuntu and Linux Mint thats only way I found. Have the same issue and laptop.