T420i screen brightness issue

This one is a little hard to explain.
I should note that this only happens when I am not plugged in with an AC adapter.
On my brand new Thinkpad, my screen's backlight will brighten when there is a lighter image on the screen and dim when there is a darker image on the screen.
The way it works is when I transition from a lighter image to a darker one, the screen will slightly lower its brightness level about twice a second. It will do this 4-5 time, dimming the screen little by litte. It isn't a lot, the total difference between the 2 brightness level is about 1 brightness leve if I were to adjust it manually. It might even be less. The annoyance is how it changes bit by bit.
I'm led to believe that this is actually a feature with the notebook, but I just can't find a way to turn it off.
Any help would be greatly appreciated.
EDIT: After a ton of fiddling, I finally got it fixed. In case anyone else wants to disable this, you have to go into the control panel, open up Intel GPU options, select Advanced, go to power, change power source to battery, and uncheck the box that says "Display Power Saving Technology"

Computer monitors may need to be calibrated. If you have AMD graphics you can go into the Catalyst control panel and adjust the gamma and white balance settings.

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HP Beats Special Edition 15-p030nr Notebook PC (ENERGY STAR) screen brightness issue

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Hi @Twright2014
Welcome to the HP Support Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I see your having some sound issues with your new notebook. I will be happy to help you with this. How does the audio sound when you use a set of headphones? Try the troubleshooting steps in this HP document No Sound from Speakers which includes using the built-in Windows troubleshooter.
Please click “Accept as Solution ” if you feel my post solved your issue.
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BHK6
I work on behalf of HP

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My new Lumia 735 has an issue with the screen brightness dimming for no reason. For completeness I have done a reset, it is nor on auto, and does I when on mains or battery. The screen is supposed to be extremely bright when set to max. However it is for about 10 secs then dims then goes bright again then dims for ages then suddenly goes bright. I have been Through all settings and changed/tried all things to no avail. I think this is not a unique problem and is prob software linked. Anyone got any ideas?

Although you say you've set the screen so the brightness is NOT set to 'auto', this sure sounds like the light sensor is still active.
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[SOLVED] Screen brightness issues with Acer 5372Z

The screen of my laptop goes black whenever I boot into ArchLinux, after "reading Udev events" on startup. Most of the time I have to use a flashlight to see the console on my screen and type
sudo setpci -s 00:02.0 F4.B=20
to set screen brightness manually. The `Fn` + `Brightness up` combination doesn't work on my machine, but that's not an issue with Arch, but fault to sugar in coffee.
There are a lot of similar threads in this forum, but none of the solutions described there really worked 100% or not at all, that's why I'm opening a new thread as this seems to be specific to my hardware.
Details:
Graphics controller:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
Screen resolution:
1366*766
/boot/grub/menu.lst:
# (0) Arch Linux
title Arch Linux
root (hd0,0)
kernel /vmlinuz-linux root=/dev/sda10 resume=/dev/sda5 ro vga=775
initrd /initramfs-linux.img
/etc/rc.conf#DAEMONS:
DAEMONS=(hwclock syslog-ng network netfs crond laptop-mode dbus gdm)
I will describe here what I have did so far on hacking:
Installed the video driver for my Intel card as described here in the wiki
Set kernel mode to `nomodeset`, without specifying vga, of course, which surprisingly solved the issue, but prevented me from using Gnome.
The supposed solution in the Arch wiki doesn't work for me. It makes it worse, in the sense of dumping screen brightness even before "reading udev events" on boot.
My current workaround (to avoid using a flashlight) is to put this line into my `/etc/rc.local`:
setpci -s 00:02.0 F4.B=20
I wonder if you can help me to solve this issue, or point me to any of the great documentation provided by the Arch community I might have missed...
Last edited by kennym (2011-09-06 16:03:58)

rg_arc wrote:I have this problem as well for my Acer Aspire 4810TZ. The only thing I can think of is to make some sort of temporary fix. But I agree with you, There should be a permanent fix. Every time I've installed Arch on this computer the same problem arises and the only way I can change the brightness is the setpci terminal method.
This is bad news for new Arch (and Linux) users. This will be probably the point where they will turn over to another distribution.
It seems to be something which has been included in newer kernels, because I can remember that in the 2.6 series this issue did not exist.
Last edited by kennym (2011-09-05 16:05:08)

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on Playbook press power button and both Vol + - buttons for 10 seconds to reboot it.
and see if it persists.
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Card Reader & Screen Brightness Issues with 3000 N100 Running Fedora 10

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Hi ugaarguy,
It sounds to me like there's some power settings that are powering down the card reader after a certain period of inactivity. This could also be the case for your brightness settings and keys.
You may find a better answer in the Fedora forums regarding these issues, so you might want to try posting there as well.
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J

Z1 screen brightness issue

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i have GE60 0ND.. (gtx660m i5 etc.)
Fn keys working with other comb.
And sometimes i get windows updates but that day i didnt update.
Also now i tried Ec reset according your advice. like there,
https://forum-en.msi.com/index.php?topic=112416.0
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i about to blow my cap.. its really annoying..

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http://img254.imageshack.us/my.php?image=img0135wb2.jpg
http://img58.imageshack.us/my.php?image=img0138xd0.jpg
http://img507.imageshack.us/my.php?image=img0136fg5.jpg
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It doesnt block the sensor, I made sure - it barely covers all of the metal part around the edges. I never noticed a problem until I read this article: then when I was testing the "glowing battery" theory I noticed that the one with the glowing battery also had a much brighter screen, even at lowest and highest brightness settings.
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I just upgraded to MacOS 10.6.8 yesterday, and since then, the screen on my Macbook is acting strange.
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[SOLVED] YASBI (yet another screen brightness issue)

i feel silly posting this, as there seems to be a lot of documentation about this, but i'm kind of baffled. if i run
echo "5" > /sys/class/backlight/acpi_video0/brightness
as root, everything works nicely, my screen turns it's brightness down to half-way (max brightness is 10).
if i run the same command as sudo, i get a permissions error. my final goal is to bind this to a key in openbox, but first i need to figure out what i'm doing wrong. do i need to be part of a certain group? do i need to edit my sudoers file?
thanks in advance.
Last edited by williamkray (2012-02-02 22:49:56)

i have solved this, and am posting how here for anyone else who might come across this in a search. this is what i came up with:
added the following to my /etc/rc.local:
chgrp users /sys/class/backlight/acpi_video0/brightness && chmod g=+rw /sys/class/backlight/acpi_video0/brightness
then i came across this script on another forum post, and saved it to /usr/sbin/brightness, made it executable and chgrp users:
#!/bin/bash
file="/sys/class/backlight/acpi_video0/brightness"
level=$(cat $file)
if [[ "$#" -eq 0 ]]; then
cat $file
elif [[ "$1" = "-" ]]; then
echo $(( level - 1 )) > $file
elif [[ "$1" = "+" ]]; then
echo $(( level + 1 )) > $file
fi
then in my ~/.config/openbox/rc.xml i added the following code to bind the commands to my Super+Up and Super+Down :
<keybind key="W-Up">
<action name="Execute">
<command>brightness +</command>
</action>
</keybind>
<keybind key="W-Down">
<action name="Execute">
<command>brightness -</command>
</action>
</keybind>
Last edited by williamkray (2012-02-02 22:51:28)

Ideapad s405 screen brightness issue on win8

I read about issues after downgrading to windows7, i have the same issue with light control on windows 8, what is the solution to that problem?

hi attilakk,
Welcome to Lenovo Community Forums!
The Issue is "Only high and low option for Brightness" This only show under WIndows 7 and can be fix by reverting to Windows 8.
You said you have WIndows 8, can you share if the same is happening or what exactly is happening in your system.
Thanks
Solid Cruver
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LE Screen Brightness issue

I have the Excite LE and have noticed that with auto brightness OFF when the battery reaches certain levels the display dimms and cannot be raised in the settings. Any idea what controls this annoying setting? For example i noticed at 88% of battery life it went down to about 30% brightness and when you try to move the brightness level, it won't move. Thanks.

I have an Excite 10LE as well and have had the same problem. Seems to happen at random. Doesn’t matter if it's plugged in or not. I've turn the auto-brightness off and slid the slide bar to the brightness setting and at some random point mine will dim to I'd say about 10 or 15% and I can't budge the slide to increase the brightness. It will slide to decrease it though. Has anyone else experienced this issue?
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Thank you! That worked. Someone please tell Lenovo tech support about this.

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Could you please tell me how can I check the screen for dead pixels or uneven screen brightness issues?
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Normally you will see any stuck (colored) or dead (black) pixels right from the get go. Many times stuck pixels will unstick over time or by running pixel fixers.
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