Debian Hardware :: Changing Display Brightness Causes Laptop To Restart

Jul 15, 2015

Today I installed debian-8.1.0-amd64 on my older Samsung Laptop (Model r560). The installation without a desktop environment worked fine and the system booted without any problems into the virtual console. There was however one problem: when I was away from keyboard for some time, the screen turned black and when I came back and hit a button to wake the system up, the laptop immediately restarted. Later I installed the gnome desktop environment. This also worked fine.

But whenever I try to change the screen brightness in the gnome-shell, my system immediately restarts and successive attempts to boot debian fail. Some time later and after countless attempts to boot debian, it finally does boot again. By "debian fails to boot" i mean the following: The initial ram disk is loaded and fschk runs. Usually the system suddenly reboots at this point. SOmetimes, however, the video mode changes, the console font is changed and some services are getting started, but then at some point the system also restarts. I don't reach the point where a login prompt appears, or the graphical environment starts up.

Assuming, it has something to do with buggy acpi implementation of my hardware, I tried the following:

I tried to disable acpi completely by using the kernel parameter "acpi=off". This doesn't work and causes the kernel to hang

I tried to start debian without using a GUI using the single parameter. This also didn't work.

acpi_backlight=vendor also did not fix the problem.

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Ubuntu :: Brightness Not Changing On Sony Vaio Cw Laptop?

Mar 21, 2010

I am having problems with the brightness control on my sony vaio laptop, at virst when i upgraded the driver for the VGA card the whole screen went blank, I had to port a bin file from windows and write my own EDID file to get it to work (nVidia GT 230M), but I am having problems with the brightness, although ubuntu does read the input from the keys (FN+...), the brightness refuses to change, adding the brightness applet to the taskbar does not work either. I really need to be able to change my brightness because the battery usage is off the charts.

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Debian :: Laptop Brightness Gets Set To Maximum On Boot

Jun 10, 2010

My laptop brightness gets set to maximium each boot.

Just wondering if this is the case for other laptop users. I have a Lenovo Thinkpad SL500 (GeForce 9300M GS) and am running Testing.

Ideally I'd like it to remember my last setting (which is usually the lowest). It'd be nice not having to turn it down each time I reboot/power-on.

It actually starts off at a low setting but during the boot process (before gdm and just after the "Waiting for /dev" line I believe) it suddenly gets set to max.

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Debian Hardware :: 7.8 - Laptop Brightness Control

May 7, 2015

I have an issue with Debian 7.8 (wheezy) on my laptop. I've had to reinstall Debian on my laptop and since then I've had issues getting brightness controls to work properly.

It's a Core i3 370M processor with Ironlake graphics, I've had this issue before with Ubuntu and I sought [URL] ..... I've tried the steps that worked for Ubuntu (thinking they'd be the same as they're both Debian based) and it hasn't worked.

What should I try to get it to work? Since I have updated my grub config (as per the Ubuntu fix), brightness doesn't work at all and my screen now tiles ever so slightly when moving the cursor from side to side. I'll revert those changes if need be or if this issue cannot be resolved.

I've tried to install the Intel graphics drivers from 01.org, however I get an issue with libglib dependencies not being satisfied ( libglib2.0-0(>=2.37.3) ) that how to resolve.

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Debian Configuration :: Unable To Change Brightness Of Laptop In Kpowersave?

Feb 17, 2010

I have installed kmilo, modprobed nvram and added line: KERNEL=="nvram", MODE="0666", GROUP="nvram" to 91-permissions.rules. I used command addgroup nvram and add me ( user tomasso ) to nvram group. Kmilo works fine but I am not able to change brightness of my laptop in kpowersave or by using fn key on my laptop keyboard. I am in powerdev group too.

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Debian Hardware :: Brightness Key Does Not Work - ASUS Laptop X553MA

May 6, 2015

how to make brightness key work ?

BOSSLINUX 5.0 derived from debian

contents of etc/brlapi.key :
==============

b356dfb09008831d4630ad46aa743ebe

contents of etc/acpi/sonybright.sh
====================

#!/bin/bash
# TODO: Change above to /bin/sh

[Code].....

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Debian Hardware :: Getting Lenny Working On Macbook / Can't Use Brightness Keys To Change Screen Brightness?

Feb 9, 2010

I'd been trying to get into Linux before I bought it so I figured that I would try to get it onto my new Mac so that I could use it wherever I am. I decided to try Debian Lenny 5.0.3 a whirl after reading about all the different distros available. I've successfully installed it and I can get to it with rEFIt, and I have quite a few things working such as the video drivers and wifi. However, I've had trouble getting it to a level where it'd be usable away from home. Here are the main problems I'm worried about:

1) I installed pommed but I still can't use the brightness keys to change the screen brightness. I'm not sure if there's some other workaround for this?

2) I tried some recommended power management packages (gnome-power-manager) but it doesn't seem to be accessible or functional right now. I don't have any way to control it or get to it that is obvious to me. Is an icon or anything supposed to appear on the task bar when you install or what? Getting some sort of power management on here is important because it gets really lousy battery life otherwise.

3) Being a Macbook, there's no right-click button. Multitouch would be really nice (two-finger scrolling!) but I'd be OK with ANY way to right-click with the touchpad. I have a wireless USB keyboard/mouse combo that works at home at least . . . right out of the box too!

4) I've seen some packages called the Mactel PPA, but they are made for Ubuntu. Since Debian and Ubuntu are so similar, is there any way to make those work on Lenny? I think that if I got those to work, I could fix some of the problems above. Or do I have to install Ubuntu?

5) I just noticed that the sound doesn't seem to work yet either.

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Ubuntu Multimedia :: Can't Control Brightness / Show Brightness Popup / Screen Brightness Don't Work

Mar 3, 2010

I Install Ubuntu 9.10 and I can't control Brightness, show brightness popup (Fn+F5F6) but screen brightness don't work, I install NVIDIA Driver Linux-x86_64 version 190.53, modiffed xorg.conf.

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Ubuntu :: Screen Brightness Randomly Changing?

Jan 3, 2011

Sometimes, out of the blue, my screen will suddenly change brightness. And no, not the gnome power manager dimming the screen when idle, I'm talking about it suddenly going from dimmest to brightest when I haven't even touched the screen brightness buttons in the last few minutes.

what package would I file this bug against)? This is Maverick on a thinkpad T60, and I can provide any other information that people find relevant. On what may be a related note, it seems that one push of the screen brightness up or down buttons causes two increments in brightness.

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Ubuntu :: Changing Brightness Of A Selected Screen Area

Apr 9, 2010

if there is a way of selecting a specific area of the screen and increase brightness? The thing is that I had to reduce my monitor brightness and contrast, due to recurring headaches. The new configuration is fine for most applications, but videos on web pages are too dark. I have created a script that allows me to change nvidia settings quickly, but when switching to the brighter setup my eyes hurt even if it is just for a moment. So I would like to be able to brighten a specific area of the screen.

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Ubuntu :: Changing Brightness / Plugging In USB Device - No Notification

Jun 18, 2010

Changing the brightness and keyboard brightness does not give a notification, though the brightness changes. In addition, ejecting a cd, plugging in a usb device, and seeking/playing music gives no notification (though Rhythmbox tells me what track I've skipped to/played). Again, the cd does eject, the usb device can be accessed, etc. I'm not sure if this last one is a problem, but every notification except for the volume one appears about 80 pixels down from the top panel. This 80 pixels below the panel is only ever occupied by the volume notification. Ubuntu 10.04, gnome-power-manager 2.30.0 ubuntu1, notify-osd 0.9.29-0ubuntu2. I'm using a Dell Studio 1555 notebook.

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Sep 17, 2010

I am wondering if it is possible turn off my display with a key of my laptop's keyboard. I mean if I press ctrl + o then my display turn off and then if I press ctrl + o my display turn on.

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Debian Multimedia :: Using Xrandr To Toggle Laptop Display

Jun 3, 2015

Background: I am running Debian 8 with the Xfce DE on my Toshiba Satellite Laptop.

When at home I will connect my laptop to an external display. I did the same while I was running Ubuntu; however, with Ubuntu I could activate my laptop display by simply disconnecting the external monitor. With Debian + Xfce, unplugging the external monitor leaves my laptop screen blank.

In order to activate my laptop display, I have to open Display settings, turn on laptop display -- which still leaves my laptop screen blank -- and then switch resolution: there are two listings for 1366x768 under resolution, and only the second one restores my laptop display. Please note that if I have both displays on at the same time the size of the output on my external monitor will be reduced to about the size of my laptop's display.

I would like the create a Bash script which can automatically switch between my displays. After some Googling it seems like xrandr is the tool I need for the job. However, I have been having trouble getting it to work.

I tried the command Code: Select allxrandr --output LVDS1 --auto --primary --output HDMI1 --off. This however just turns my external display off without turning on my laptop's display. I suspect this has something to do with the fact that LVDS1 has two modes at 1366x768; perhaps only one of them can actually display? I'm not sure, but anyways here's the output of xrandr:

Code: Select allScreen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768      59.99*+
   1360x768      59.80    59.96 
   1024x768      60.00 
   800x600       60.32    56.25 

[Code] ....

Is there a way I can specify that xrandr should use the second 1366x768 mode?

I just realized that the second mode is, in fact, 1360x768 rather than 1366x768...

The good news is that I fixed my problem. It turns out that my backlight was not turning on, giving the appearance that my laptop screen was not displaying anything.

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Jul 14, 2015

I want to display the image only on the VGA external screen. When I am connecting VGA cable, the image not displaying on the VGA external screen.

My notebook specifications:

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- Video card: Radeon HD 8650G
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Dec 26, 2010

i have a desktop computer with a fresh install of ubuntu 9.1. the display is too dark to see pictures and several websites as well. is there a gui tool for color and brightness correction, or do i need to do something special?

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May 28, 2010

Ubuntu 10.04 lucid with gnome-power-manager installed on a HP elitebook 8530p. FN keys and desktop display applet will not adjust the display. when I first boot my display is pretty bright with either it plugged into ac or not until i either plug or unplug for the first time then the display dims some, but will not get bright again plugged or unplugged, also /proc/acpi/video/DGFX/LCD/brightness shows it set to 100% at all times it never changes. I'm using the ati driver tried running aticonfig --acpi-services off, but it made no difference. It worked fine in karmic and ibex. I'm out of ideas on how to fix this one. Can anyone point me in the right direction on what to try next?

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Mar 16, 2010

After manually setting the display brightness on my laptop, the system re-sets the value. If the laptop is plugged in, the value is set to full brightness; if it is not plugged in, it is set to dimmer. How do I stop that behavior?

Note that I am not talking about what it does in response to the event of plugging in or unplugging my system. It changes on it's own - usually several minutes after I change the brightness value. I have observed this behavior on different systems, different distributions, and different desktop environments.

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Jan 28, 2010

After updating to 9.10 NBR on my MSI U90 it behaves like pressing the function keys "increase brightness" and "decrease brightness" continuously, including show the appropriate pop up.

I guess it is related to power management because it mainly happens while on battery.

How can I get rid of this problem?

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Mar 25, 2010

I am running Karmic (9.10) on my macbook air (2,1) and although many things work fine (I wrote about it here:[URL]) one of the last things that doesn't work is setting the screen brightness. The FN-F11/F12 combo does bring up the brightness adjustment notification window (top right) and I can change the setting, but it has no effect UNTILL I reboot or suspend to RAM and reboot.

A related issue is that the brightness doesn't automatically adjust to the surrounding brightness.

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Jul 25, 2011

I have installed Xubuntu 11.04 on a HP Probook 4510S and the FN Keys of brightness only works when I on the login screen (gdm). Until I enter to my desktop the FN Keys stop Working. This is a XFCE Issue? I have another Laptop, a IBM THinkpad X40, with the same Xubuntu 11.04 and the FN Keys works perfect! Even the keyboard light Works! I think this is a ACPI related problem, I google it the problem with out a specific issue like this. The only thing that I can do it is use of xbacklight when I'm on my session.

root@xavierc-lt-xub:~# ls /proc/acpi/
ac_adapter battery button event wakeup
root@xavierc-lt-xub:~#

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Apr 24, 2011

I have acer Aspire 5742 with mint 9 {64/32 bit both} installed.. I cannot adjust brightness of my laptop in any of them.. The shortcut keys are working fine as increasing or decreasing through keys show icon increasing or decreasing brightness but it is not affecting brightness in anyway.

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Jul 4, 2010

i have an alienware M11X and i have installed fedora. I have a problem with brightness. When i press hotkey for increase or decrease brightness i see the bar increase and decrease on my screen but brigthness don't change and stay maximal. I have tested a live cd ubuntu and it's work.

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Feb 23, 2010

I got a new Sony F series laptop and struggled thru getting the video card to work, the wireless card to work, and the volume to work on 9.10. The brightness controls have stumped me though. The screen is on full bright and the brightness controls (FN+F5 & FN+F6) make the applet display change but the actual screen brightness does not change. I have also tried the brightness applet in the panel and that also has no effect on actual screen brightness.

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May 5, 2010

I have an Asus P50IJ-X2 and in lucid the backlight cannot be adjusted. The panel app doesnt work, when I click on it and try to adjust the slider it just disappears. When I reopen it the slider is at the top left corner of the screen.

The function keys seem to be detected alright, but when I press them I get the notification that the brightness is going down but nothing happens. Also after the first press the notification gets extremely laggy. If I press the brightness keys again it takes 30 seconds or more for the notification to show up. Also after the first press my volume function keys have the same behaviour in the notification area as the function keys.

Also messing with the controls in the power settings doesn't do anything. The strange thing is all of this worked perfectly in Karmic. The function keys, auto dimming, everything just worked out of the box. I have no idea where to start trouble shooting this so can anyone give me some direction?

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Apr 23, 2011

I want to know how can I increase the brightness of my LCD screen. I have a toshiba sattelite A500-1f4 laptop with nvidia geforce gt 330m video card. I work on centos 5.6 x86-64 system.

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Feb 9, 2010

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Apr 4, 2011

Every once in a while my laptop screen gets stuck on the lowest brightness setting. I go to the brightness setting, and it tells me it is on the highest setting. When I reset my settings, nothing happens. And I notice this usually happens after I have put the laptop in suspend mode.

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Apr 25, 2010

I have installed Fedora12 on Dell Inspiron laptop. Here are my key details of my laptop.

<Fn + F4 > ---- For decreasing Brightness
<Fn + F5 > ---- For increasing Brightness
<Fn + F2 > ---- To enable Bluetooth

I am able to enable bluetooth by pressing <Fn + F2>, But I am not able to increase OR decrease brightness of my laptop screen.I have attached keymap of my laptop by the output of

Code:
xmodmap -pke
Please find the attachment keymap.txt.

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Mar 15, 2010

I'm currently trying to setup a minimal Slackware installation. Everything is well, except for screen brightness/hard disk control via laptop-mode-tools. I was wondering if anyone used it, and if they got it to work on their Slack systems, how they went about doing it.

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Mar 23, 2010

I did these steps to change my username: I like to directly edit /etc/passwd and /etc/groups

First open a terminal, become root
Code:
sudo -i
Now:
Code:
usermod -d /home/new -m old
sed -i -e 's_old_new_g' /etc/passwd
sed -i -e 's_old_new_g' /etc/group<-
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