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[ubuntu] Yet annother laptop backlight thread

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http://ubuntuforums.org – Hello, I understand that these topics litter all of the different distributions forums, but I have not been able to find a satisfactory answer to my issue. I'm trying to set up a gateway M-7301u laptop (intel mobile 4 vga controller and some intel mb I'm not sure which) but I've been having trouble with the backlight. Originally I couldn't adjust the backlight at all without the computer freezing and eventually crashing the unity session. I normally use fedora so I tried the usual solution from there of setting acpi_backlight=vendor and acpi_osi=Linux in grub.cfg. Now I am able to change the b (Hardware)

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Submitted by linuxfan on 12/27/2011 – Made popular on 12/27/2011

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Welcome to the Arch Forums @Dronte. I have been having similar issues with my backlight on my HP G62 lappy (Intel HD along with ATI HD 5470). Basically, if I add acpi_osi=Linux and acpi_backlight=vendor to the kernel line I'm unable to control my backlight like you.So, I'm disabling my discrete graphic with an acpi call and using the Intel one only.

I have this laptop that doesn't handle the backlight very well.

In /etc/default/grub, I have added a acpi_backlight=vendor function to get it to work at all. Which is cool, and the backlight now actually works, but the minimum backlight setting is still pretty high.

Is there any way to decrease the backlight below minimum?

I have a laptop mySN QMG6 / Chiligreen Mobilitas NW which is Quanta TW9 barebone with intel i3 and nvidia 335m GT onboard. On ubuntu distros 10.04, 10.10, 11.04 and 11.10 i had problem with changing screen backlight with nouveau and nvidia drivers.

ebait wrote:Tried this. Did not work. Updated kernel to 3.8, still nothing.Not surprising. acpi_backlight is about the screen backlight, not the keyboard backlight. This is a bit strange that 3.8 killed the screen backlight, despite the acpi_osi="!Windows 2012" argument. I'm somehow glad that I bought the UX32VD instead of the UX31A.

HP kde backlight nvidia 313.18 15 weeks 2 days ago

Hi, i have an elitebook 8560w. Under gnome the backlight seemed to work fine. In kde the function keys made the popup to appear, but the backlight was not changed. After latest updates even the popup does not show up.I've tried echoing into /sys/class/backlight/acpi_video0/brightness and it workedI tried also the solutions from this thread: https://bbs.archlinux.org/viewtopic.php?id=1511191.

When going to sleep mode to save battery, in the power management options, the option to dim the backlight won't work : the image on the screen turns black OK, but the backlight remains on :mad:

PS: Unity can't work on this system (Intel 82855GME)

EDIT: ls /sys/class/backlight/ returns nothing

I have a Toshiba l755 laptop, and I installed 12.04 64bit on it. The default brightness of the laptop is set to maximum value, and I can't change it.

If I go to Configuration → Brightness, the brightness doesn't change and neither does pressing the function keys.

I just installed Arch Linux with Gnome and the nvidiabl driver from https://github.com/guillaumezin/nvidiabl , and it seems to work. If I do "echo x > /sys/class/backlight/nvidia_backlight/brightness" the brightness does change. However, if I try to use my shortcut keys (Fn+F5, Fn+F6), the brightness does not change.

Hi, I have a really strange problem with the laptop-mode tools. First off, the details. I'm using an Asus UX32VD(fixed the backlight buttons with the script etc.