HAL and screen brightness

So for some reason I could change screen brightness, but only by setting the default in gnome-power-manager. In order to get the function keys to work too I had to play around with HAL config (using an example I found in an ubuntu bug report)
Given that HAL is now deprecated, what is replacing it for handling screen brightness?

pl give the details of your graphics card. in some cases you need to use setpci command. Most of the Intel integrated graphics work out of box. For latest nvidia cards still some issues to be resolved.

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Is there a way to save keyboard backlight and screen brightness settings?

It seems like my settings for the keyboard backlight and screen brightness reset to some sort of default after I don't use my macair for an extended period of time. Is there a way to change these settings so it always stays at what it was last left on?

Are you making the changes through System Preferences? If not, try that and they should hold.

Gnome-power-manager and screen brightness

gnome-power-manager appears to be screwing with my ability to adjust the screen brightness. Now there are only two brightness settings that work - the ones defined in gnome-power-manager settings. Using the keyboard shortcuts "works" in that I can increase the brightness one level but then the change gets overridden. Decreasing the brightness sets it at the minimum level then I can get it back without entering gpm settings. This definitely work before the last update and I think for a while after.
Is there anyway I can get it to listen to manual adjustments?
Edit: I think this was due to the latest hal update.
> lshal | grep bright
laptop_panel.brightness_in_hardware = false (bool)
Edit 2:
Found http://ubuntuforums.org/archive/index.php/t-290994.html
Adding "video" to MOD_BLACKLIST in /etc/rc.conf fixed this. This is just a kernel module right? Nothing else will be screwed...?
Last edited by Allan (2007-10-31 11:30:37)

I have Sony Vaio VGN-FZ38M with Nvidia 8400M GT. I used package 'nvclock' (it is in repo) to control lcd brightness, here site with more info: NVClock. Some time ago I also configured Fn keys to work with it (on Ubuntu), but on Arch I didn't manged but I didn't try hard (in general i don't need, my laptop is stationary all the time). Solution I've found somwehere in Ubuntu forums.
edit: typo in address
edit2:
here's the solution from Ubuntu: http://newyork.ubuntuforums.org/showthr … ?t=1004568
Last edited by folletto (2009-06-14 20:58:56)

Default Sound Balance and Screen Brightness?

Recently my iBook G4 has been booting up with the screen brightness all the way down and the speaker balance all the way to the left. Did these settings somehow get set as the defaults? How do I change it back to normal so that I dont have to keep changing the settings every time I boot up?

There has been a bug in OSX in regards to sound balance for notebooks since 10.3.5 (IIRC). To fix it look for a free app called Balanced, that should correct the problem.
As for the screen brightness, I've never heard or seen anything like that.

MacBook Air Ambient Light and Screen Brightness

I've installed windows 7 on my macbook air and everything is working great for over a year now. The only thing that's not working is the auto adjustment of the screen brightness. I It is working on MacOS but not on Windows 7.
Thank you,
Christos Polydorou

This is one of those situations where the word "probably" applies. It just depends on whether you want to trust a product with no stated applicability to the purpose for which you intend it.
I think I would stick to products either indicating that they are safe for use on computer LCD displays, or follow Apple's recomendation of using just water to moisten a lint-free soft towel.

Beats volume animation, fn+b which triggers beats, and screen brightness animation aren't working.

My hard drive crashed and i had to get a new one. when i got my laptop back all of the utilites were gone. what i want is to be able to adjust the screen brightness and have the same animation as before. i also want to turn the volume up and down and see a beats music volume animation. also when i press fn+b it turns beats music on and off but since i got my hard drive fixed it doesnt do that either. can some one please help me. thank you.

My hard drive crashed and i had to get a new one. when i got my laptop back all of the utilites were gone. what i want is to be able to adjust the screen brightness and have the same animation as before. i also want to turn the volume up and down and see a beats music volume animation. also when i press fn+b it turns beats music on and off but since i got my hard drive fixed it doesnt do that either. can some one please help me. thank you.

Envy sleekbook speaker rattling and screen brightness won't go down

Hello! I have an hp envy that when I play any music on there is a rattling sound coming from the top left speaker. The sound stops when I press mute. I restarted the computer and tried to play a song file and it seemed fine until I started another program (windows movie maker) and the sound again started to rattle. It has not done this in months. I bought the computer in October 2014 and I remember hearing that rattling sound briefly, but then it stopped and I never noticed it again.
Also, just in the past day I noticed that my screen was super bright and in an effort to save energy I hit the key on the the keyboard and nothing happened. I went to settings and scrolled the brightness down but the screen did not change.

Holly_J wrote:
Here are some troubleshooting steps to try for the screen brightness: http://h10010.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c00832191
As for the speaker, you may want to try reinstalling the wireless driver: http://h30434.www3.hp.com/t5/Other-Notebook-PC-Questions/Buzzing-and-Crackling-Sound-w-HP-ENVY-Sleek...
Let me know if that helps!
I've checked out the link and tried a few of those options however my screen brightness will not change. The slider in the options says that it is all the way down but the screen does not change. And when I press the keys on the keyboard for brightness nothing pops up on the screen saying that it is going up or down. This is just strange. It doesn't adjust when I unplug the power adapter either.

XFCE and screen brightness meter

Recently I have notice a brightness meter shows up in the center lower part of my screen when i adjust the brightness on my laptop. Was this due to something in the recent GNOME upgrade - it was never there before?
The reason I want to know is that is doesn't work... There is no actual value displayed, just a blank meter and I would like to get it working. Something similar for volume would be good too but first things first

Update: it works fine when I unplug/plug the power to my laptop, but not when I change it manually...
Strange

HT201401 After io6 upgrlade on my iPhone 4S battery life is about 1/2 what it was. I turned wifi and Bluetooth off and screen brightness down low. After about 4 hours battery is dead. Also my screen enlarges randomly and only way to fix hold lock back ke

After updating to iOS six my iPhone battery life is about a third of what used to be. my screen enlarges the font and I can't make it go back to a smaller font without totally doing a hard reset

Are you asking a question here?
Batterly life has been discussed ad nauserum on this forum. Please use the search box at the top right hand corner of this page.

[SOLVED] ASUS Screen Brightness Not Working

I have been trying for a few hours to get my screen brightness to work properly. I'm on an ASUS Zenbook Prime UX31A with kernel 3.9.6-1. I'm using efibootmgr to boot.
According to the wiki page and numerous posts, I need to use the acpi_osi="!Windows 2012" boot parameter. When I set it using efibootmgr, the keyboard backlight keys work (Fn+F[34]), but the screen brightness keys (Fn+F[56]) do not work. I have tried the following in efibootmgr:
# efibootmgr -c -w -d /dev/sda -p 1 -L "Arch Linux" -l '\EFI\arch\vmlinuz-arch.efi' -u initrd=EFI/arch/initramfs-arch.img root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 efi_no_storage_paranoia elevator=noop acpi_osi=Linux add_efi_memmap
# efibootmgr -c -w -d /dev/sda -p 1 -L "Arch Linux" -l '\EFI\arch\vmlinuz-arch.efi' -u initrd=EFI/arch/initramfs-arch.img root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 efi_no_storage_paranoia elevator=noop acpi_osi=intel add_efi_memmap
# efibootmgr -c -w -d /dev/sda -p 1 -L "Arch Linux" -l '\EFI\arch\vmlinuz-arch.efi' -u initrd=EFI/arch/initramfs-arch.img root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 efi_no_storage_paranoia elevator=noop acpi_osi= add_efi_memmap
and a few others. The particularly peculiar thing is when I use a UEFI shell to boot with my script:
echo -on
\EFI\arch\vmlinuz-arch.efi root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 add_efi_memmap efi_no_storage_paranoia initrd=EFI/arch/initramfs-arch.img elevator=noop acpi_osi="!Windows 2012"
it works fine (both keyboard backlight and screen brightness).
What am I doing wrong? My hunch is that I'm doing something wrong with the formatting of acpi_osi="!Windows 2012" but I'm pretty sure I've tried every combination of different quotes and escaping different things. It's also worth nothing that the "!" gets interpreted by bash in some of these permutations making efibootmgr not actually run.
Last edited by tobit (2013-06-30 02:37:30)

WonderWoofy wrote:
Because you are entering it in a shell, you need to escape some of the things in the acpi_osi="!Windows 2012" string. So for example, the double quotes are intended to be entered exactly as is in the resulting efibootmgr entry, so these should be esacped since they would otherwise have a special meaning in the command line. The same is true for the exclamation point. So I think you would have to do:
efibootmgr -c -w -d /dev/sda -p 1 -L "Arch Linux" -l '\EFI\arch\vmlinuz-arch.efi' -u "initrd=/EFI/arch/initramfs-arch.img root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 efi_no_storage_paranoia elevator=noop acpi_osi=\"\!Windows 2012\" add_efi_memmap"
BTW, this is just a copy/paste of one of the entries above (slightly fixed). I added a '/' to your initrd entry, as it is supposed to be an absolute path, not a relative one.
Edit: I too started out with a direct efibootmgr entry when getting to know UEFI. But I think that a better solution is to use a boot manager. I like gummiboot, but I also keep rEFInd set up as well. By doing this, if you ever want to chane something on your kernel command line, you can just edit the config before reboot. But I think that were it is really useful is if you need to modify the kernel command line before you boot, as it is not possible with a direct efibootmgr entry. If you want to make it seem seamless, just set the timeout to zero in efibootmgr, and then if you want to get to the menu, you just hold the spacebar while booting.
The reason I wanted to use a direct efibootmgr entry was because I thought it would be faster. But because gummiboot and systemd will actually give you the time it takes to boot which includes the time in the firmware (POST) as well as the time it takes to get through the boot manager, I have actually found that my system takes a whole 14ms from the end of POST to starting to load the kernel.
Edit2: BTW, I also quoted the entire srting of arguments on the kernel command line, which it need in order to be fed to the '-u' option as a single string.
I'm afraid that still doesn't work. I've tried similar things and tried that specifically. In case you're wondering, the command you listed gives me the following output:
$ sudo efibootmgr -v
BootCurrent: 0000
Timeout: 2 seconds
BootOrder: 0000
Boot0000* Arch Linux HD(1,800,96000,bee2185e-de97-4dc0-9614-830639991bc3)File(\EFI\arch\vmlinuz-arch.efi)i.n.i.t.r.d.=./.E.F.I./.a.r.c.h./.i.n.i.t.r.a.m.f.s.-.a.r.c.h...i.m.g. .r.o.o.t.=.U.U.I.D.=.d.0.b.3.2.0.8.0.-.8.4.f.0.-.4.c.6.b.-.9.3.3.b.-.f.6.2.b.8.8.0.a.f.c.0.9. .r.o. .r.o.o.t.f.s.t.y.p.e.=.e.x.t.4. .e.f.i._.n.o._.s.t.o.r.a.g.e._.p.a.r.a.n.o.i.a. .e.l.e.v.a.t.o.r.=.n.o.o.p. .a.c.p.i._.o.s.i.=.".\.!.W.i.n.d.o.w.s. .2.0.1.2.". .a.d.d._.e.f.i._.m.e.m.m.a.p...
I also tried putting the -u argument in single quotes so that I don't have to escape the double quotes or the !. That also didn't work. Thanks for your suggestions, I'd be happy to try more, I've tried a lot already to no avail :-(
count0 wrote:On my Asus X201E, the screen brightness keys only work when I add "acpi_osi=" to my kernel parameters, with no arguments. You could try that.
That's the third option I say that I tried in my original post.

HI all, i'm using Mac Pro 15" Retina. My screen goes darker and after brighter after a while? How to fix it?

HI all, i'm using Mac Pro 15" Retina. My screen goes darker and after brighter after a while? How to fix it?

System Preferences > Displays.
De-select "Automatically adjust brightness"

Have Upgrade Graphic Card Driver, But Still Cannot Adjust Screen Brightness and Sleep Button Not Showing After Clean Installation of Windows 8.1

I have done clean installation of Windows 8.1 on my HP Pavilion G4.
Then I realize that I cannot put my computer on sleep mode and cannot adjust screen brightness.
I understand that those problems caused by the graphic card driver.
My computer is running on AMD Radeon HD 6400 series.
Thus, I manually search on internet and found a latest graphic card update on microsoft site that is claimed compatible on windows 8.1 (link: http://msdn.microsoft.com/en-us/library/windows/apps/dn344644.aspx).
I've upgraded it into the latest one. I've check on Device Manager, the driver is running well.
But my problem did not solved!
Please give me the solution!

Hi,
How about go to Device Manager, then uninstall Graphic driver and restart your computer, system will install its build in graphic drver. You can have a try.
In addition, access to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Brightness and set its value to 100 for test.
Roger Lu
TechNet Community Support

24" iMac Screen Brightness Bug and others

Hi,
There seems to be some serious issues with the 24" iMac. About 6 days ago I bought a 24" iMac (2.66 Mhz model w/4 GB RAM + 640HD).
Out of the box it had Leopard 10.5.5 installed; there were several problems.
1. Screen brightness was way too BRIGHT. Display preferences would not pull brightness down. At least not down far enough so that the screen could be viewed without extreme discomfort. Plus add insult to injury a reboot would reset the preferences to maximum brightness. NOTE: An upgrade to 10.6.1 did NOT fix the issue.
2. Viewing a browser page via either Safari or Firefox (latest versions of each) was not good. A vertical scrolling would be jumpy and appear pixelated. Upgrade to 10.6.1 seemed to fix most of the issue in Safari, but Firefox was still not working properly. The issue appeared like a horizontal "ripple" in about the bottom 2/3 of the browser window. The effect did NOT extend outside of browser window. Changing screen resolutions did not work.
3. Connecting a USB Logitech head set caused issues with Sound preferences.
If the head set was connected during startup the machine would recognize them as main sound. The internals speakers did NOT appear in the Sound preferences. as an optional choice. Removing USB headset and reboot would return the internal speakers to the Sound preferences. Plugging in headseat would work for a while. We could repeat and same problem would occur.
These are all in 10.6.1 - definate bugs.
Returned with the iMac to the Apple store. Bottom line, after nearly three hours; the Apple technician, and everyone could see what we were talking about.
Regarding the screen brightness. Nothing they could do about it. They stated that "not too many people have complained about it, to their knowledge." They stated that the electronics in the "florescent" panel could not be turned down the same way. TRANSLATION: The programers at Apple let this one slip past them. As a customer (software programmer & network analyst) I expected a bit more of an intelligent answer.
However.
Examining the 20" model I noticed that we could turn down the screen brightness - at least to a level that my wife and I could live with. PLUS the settings remained after a restart. Something that was NOT happening with the 24" model.
So - we exchanged the 24" for a 20". Frankly we are a LOT happier. The Safari/Firefox issue is still carried over to the 20". However it is not nearly so noticable on the smaller screen.
Plus the USB headset did not cause the same Sound Preference issues.
So - Thanks for the speedy return/exchange of the iMac. But someone needs to look at this from the programming side of things.

HI, in response to 1_pixelperson, we've returned TWO iMacs with 24 inch screens, both so bright our eyes bugged out ... the current 20 inch is our third computer in 8 days ... he reported specifics
We did find a SCREEN DIMMER app <www.adpartnership.net/DarkAdapted/> ... no solution via Apple ... iPhoto migration funky, dates out of sync, not valid, but thankfully Time Machine really works ... Firefox remains wobbly, not smooth ...
Also, be careful when loading pics from phone with Bluetooth, it sucked my entire address book into my phone.
People at Apple store were nice, today's 20 minute scheduled Genius meeting morphed into two hours+ ... including return ... would have preferred 20 inch with larger HD, came with 320 ... they couldn't do, upgraded ram while there.

How do I make screen brighter and the sound quality better with W8 OS on my iMac through bootcamp assistant like it is with my mac os ?

How do I fix my screen brightness on my imac via W8 OS on my Imac through boot camp assistant and How do I fix the quality of the sound coming from my imac when in w8?

Alright, first off, thank you for your help so far. I really appreciate it. However, now I have a new problem that I need help with.
I did exactly what you've said to do, and it worked fine, the screen itself became brighter again, it was just too dim before and the brightness settings were all the way up, but after doing what you said to do, It's as it is when using my Apple/Mac OS. The sound coming from the computer speakers and all the other audio issues have been fixed as well. It all sounds like it should in terms of quality. It's just now that I did that, I'll shutdown my computer, or even restart it for some reason, and each and every single time I do that, It's all back to the way it was before installing anything, dim and poor audio quality. Until I install the drivers again like before.
Am I going to have to get used to that or something? Or is there an option I'm just not seeing that would make these preferences and instalations permanent until I input/imply otherwise??
Thanks in advance!!

T420s - screen brightness increases and decreases

Hi,
I have noticed on my T420s that screen changes screen brightness depending on the picture on the screen.
For example:
- I look at some site with dark background and few grey letters
when I switch screen to my outlook or for example firefox with this forum that has white background at first few minutes white is gray and then it gradually becomes whiter and whiter until after about 2 seconds it settles.
I thought at first my eyes have issue, but it is definetly behaviour of my laptop.
Anyone with the same issue? Can this be fixed by some software/power manager tweak?
Solved!
Go to Solution.

Yes, I run it on battery and with Intel HD
It is display power saving thing - thank you

HAL and screen brightness

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