Screen brightness wont change

HI
For my HP Pavilion 15-e017tx.
It was working fine till yesterday. But today when i tried to change screen brightness it wont change.
I did it from the special keys provided for it and also from the windows mobility center.
Tried to change the Power plan as well.
Restarting the system also didnt help.
Please let me know what to do about it.
Thanks

Try doing System Restore to a previous good state, at least 24-hours before the problem started:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&lc=en&docname=c03327545
OR
http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&lc=en&docname=c01867418
Thanks,
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EDIT: never mind, it seems to of gone away now...i have no idea what happened, it stopped working randomly then started working just as randomly.....whatever...
Just yesterday i was using my laptop with arch linux with the brightness turned all the way down, as of course it saves battery
but now i turn it on today and the screen is at maximum brightness, and every time i try to change it it just says (in kernel.log) :
Sep 8 10:28:46 Polygon kernel: ACPI: Failed to switch the brightness
Sep 8 10:28:46 Polygon kernel: ACPI: Failed to switch the brightness
so...what got upgraded that broke this? does anyone else have this problem?
here is the past few days of my pacman.log: (it has some entries for kernel-my, a custom compiled kernel, but i get no screen brightness control on my custom compiled kernel, or the default arch one)
[2009-09-01 11:24] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:24] installed kernel26-my (2.6.28-1)
[2009-09-01 11:25] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:25] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:26] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:26] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:29] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:29] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:30] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:30] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:34] removed kernel26-my (2.6.28-1)
[2009-09-01 11:34] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:34] installed kernel26-my (2.6.28-1)
[2009-09-01 11:38] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:38] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:40] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:40] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:40] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:40] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:42] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:42] upgraded kernel26-my (2.6.28-1 -> 2.6.28-1)
[2009-09-01 11:46] removed kernel26-my (2.6.28-1)
[2009-09-01 11:47] >>> Updating module dependencies. Please wait ...
[2009-09-01 11:47] installed kernel26-my (2.6.28-1)
[2009-09-01 12:21] installed rsync (3.0.6-1)
[2009-09-01 12:21] installed abs (2.3.3-1)
[2009-09-01 12:32] installed nvidia_arch-mark-grandi (185.18.36-1)
[2009-09-01 13:01] synchronizing package lists
[2009-09-01 13:02] starting full system upgrade
[2009-09-01 13:03] upgraded python3 (3.1-2 -> 3.1.1-1)
[2009-09-02 09:22] synchronizing package lists
[2009-09-02 09:23] starting full system upgrade
[2009-09-02 09:23] upgraded coreutils (7.4-1 -> 7.5-1)
[2009-09-02 09:23] upgraded libarchive (2.7.0-2 -> 2.7.1-1)
[2009-09-02 09:23] upgraded module-init-tools (3.8-1 -> 3.10-1)
[2009-09-02 09:23] upgraded raptor (1.4.18-1 -> 1.4.19-1)
[2009-09-02 09:23] upgraded redland (1.0.8-3 -> 1.0.9-1)
[2009-09-02 09:23] upgraded syslog-ng (3.0.3-2 -> 3.0.4-1)
[2009-09-02 12:11] removed kernel26-my (2.6.28-1)
[2009-09-02 12:30] >>> Updating module dependencies. Please wait ...
[2009-09-02 12:30] installed kernel26-my (2.6.28-1)
[2009-09-02 12:52] removed nvidia_arch-mark-grandi (185.18.36-1)
[2009-09-02 12:53] installed nvidia_arch-mark-grandi_ver2 (185.18.36-1)
[2009-09-03 10:23] synchronizing package lists
[2009-09-03 10:24] starting full system upgrade
[2009-09-03 19:34] synchronizing package lists
[2009-09-03 19:35] starting full system upgrade
[2009-09-04 09:08] synchronizing package lists
[2009-09-04 09:09] starting full system upgrade
[2009-09-04 12:27] synchronizing package lists
[2009-09-04 12:27] starting full system upgrade
[2009-09-04 12:28] upgraded apr (1.3.8-1 -> 1.3.8-2)
[2009-09-04 12:28] upgraded damageproto (1.1.0-2 -> 1.2.0-1)
[2009-09-04 12:28] upgraded dmxproto (2.2.2-2 -> 2.2.99.1-1)
[2009-09-04 12:28] upgraded fontsproto (2.0.2-2 -> 2.1.0-1)
[2009-09-04 12:28] upgraded videoproto (2.2.2-2 -> 2.3.0-1)
[2009-09-04 12:28] upgraded xf86dgaproto (2.0.3-2 -> 2.0.99.1-1)
[2009-09-04 12:28] upgraded xf86vidmodeproto (2.2.2-2 -> 2.2.99.1-1)
[2009-09-04 12:28] upgraded xineramaproto (1.1.2-2 -> 1.1.99.1-1)
[2009-09-04 12:29] installed pyxdg (0.17-1)
[2009-09-04 12:29] installed setuptools (0.6c9-2)
[2009-09-04 12:29] installed libtorrent-rasterbar (0.14.4-2)
[2009-09-04 12:29]
[2009-09-04 12:29] >>> Deluge's daemon is running with the "deluge" user. The default download directory is /srv/deluge/
[2009-09-04 12:29]
[2009-09-04 12:29] installed deluge (1.1.9-2)
[2009-09-04 12:29] installed python-chardet (1.0.1-2)
[2009-09-04 19:58] synchronizing package lists
[2009-09-04 19:59] starting full system upgrade
[2009-09-06 12:47] synchronizing package lists
[2009-09-06 12:48] starting full system upgrade
[2009-09-06 12:48] upgraded cloog-ppl (0.15.3-1 -> 0.15.7-1)
[2009-09-06 12:48] upgraded gnupg (1.4.9-4 -> 1.4.10-1)
[2009-09-06 12:48] upgraded gstreamer0.10-bad (0.10.13-1 -> 0.10.14-1)
[2009-09-06 12:48] upgraded gstreamer0.10-bad-plugins (0.10.13-1 -> 0.10.14-1)
[2009-09-06 12:48] upgraded gstreamer0.10-good (0.10.15-3 -> 0.10.16-1)
[2009-09-06 12:48] upgraded gstreamer0.10-good-plugins (0.10.15-3 -> 0.10.16-1)
[2009-09-06 12:48] upgraded libdrm (2.4.12-1 -> 2.4.13-1)
[2009-09-06 12:48] upgraded libfontenc (1.0.4-2 -> 1.0.5-1)
[2009-09-06 12:48] upgraded libice (1.0.5-1 -> 1.0.6-1)
[2009-09-06 12:49] upgraded libpciaccess (0.10.6-1 -> 0.10.8-1)
[2009-09-06 12:49] upgraded libxau (1.0.4-1 -> 1.0.5-1)
[2009-09-06 12:49] upgraded libxcursor (1.1.9-2 -> 1.1.10-1)
[2009-09-06 12:49] upgraded libxinerama (1.0.3-2 -> 1.0.99.1-1)
[2009-09-06 12:49] upgraded libxxf86dga (1.0.2-2 -> 1.0.99.1-1)
[2009-09-06 12:49] upgraded libxxf86vm (1.0.2-1 -> 1.0.99.1-1)
[2009-09-06 12:49] upgraded man-db (2.5.5-2 -> 2.5.6-1)
[2009-09-06 12:49] upgraded mesa (7.5-2 -> 7.5.1-2)
[2009-09-06 12:49] upgraded nss (3.12.3.1-1 -> 3.12.4-1)
[2009-09-06 12:49] upgraded pixman (0.14.0-2 -> 0.16.0-1)
[2009-09-06 12:49] installed rasqal (0.9.16-1)
[2009-09-06 12:49] upgraded redland (1.0.9-1 -> 1.0.9-2)
[2009-09-06 12:49] upgraded xf86-input-synaptics (1.1.2-2 -> 1.1.3-1)
[2009-09-06 12:49] upgraded xorg-font-utils (7.4-2 -> 7.4-3)
[2009-09-06 12:49] upgraded xorg-server (1.6.3-4 -> 1.6.3.901-1)
[2009-09-06 17:54] synchronizing package lists
[2009-09-06 17:54] starting full system upgrade
[2009-09-07 12:06] synchronizing package lists
[2009-09-07 12:07] starting full system upgrade
[2009-09-07 12:07] synchronizing package lists
[2009-09-07 12:07] starting full system upgrade
[2009-09-07 12:07] upgraded alsa-lib (1.0.20-1 -> 1.0.21-1)
[2009-09-07 12:07] upgraded alsa-utils (1.0.20-2 -> 1.0.21-1)
[2009-09-07 12:07] upgraded hdparm (9.21-1 -> 9.26-1)
[2009-09-07 12:07] upgraded usbutils (0.84-1 -> 0.86-2)
[2009-09-07 13:15] installed gedit-plugins (2.26.2-1)
[2009-09-07 17:43] synchronizing package lists
[2009-09-07 17:44] starting full system upgrade
[2009-09-07 17:44] Install jack-audio-connection-kit, libsamplerate, ffmpeg
[2009-09-07 17:44] or pulseaudio to get their respective plugins working
[2009-09-07 17:44] upgraded alsa-plugins (1.0.20-1 -> 1.0.21-1)
[2009-09-07 17:44] upgraded gnupg2 (2.0.12-1 -> 2.0.13-1)
[2009-09-08 10:18] synchronizing package lists
[2009-09-08 10:19] starting full system upgrade
[2009-09-08 10:22] upgraded fftw (3.2.1-1 -> 3.2.2-1)
[2009-09-08 10:22] upgraded fuse (2.7.4-3 -> 2.8.0-1)
[2009-09-08 10:22] upgraded gparted (0.4.6-1 -> 0.4.6-2)
Last edited by Polygon (2009-09-10 01:51:39)

Do you happen to know what package broke this? I had this issue a couple weeks ago, and just recently it reappeared.

I am unable to change my screen brightness using the fn+f2/fn+f3 keys. i understand that it can stil

I am unable to change my screen brightness using the fn+F2/fn+F3 keys. I understand that it can still be adjusted differently but I want this way to work. Also whenever I change my volume using the fn+F7/fn+F8/fn+F9 keys, the little on-screen display doesn't pop-up any more. I would like to fix this and any help would be greatly appreciated.

Hi
You have a couple of options as I see it please find the web link given below and the steps might help you to fix your issue on the unit.
Resolving Problems with the Brightness of the Display
Let us know how it goes!
*Although I am an HP employee, I am speaking for myself and not for HP.
****Click the White Kudos star to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath
Let us know how it goes!
"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath

Screen brightness changes between standbys

I just received my new Macbol Pro C2D after realizing that the Macbook, just didn't have enough graphic power. And the quality of the screen was suspect, considering all f the ghosting.
But I noticed that when I start up my macbook from a sleep, the brightness often changes. The only thing i can hope it is is that the laptop is trying to be helpful by adjusting it's brightness to suit the the current envionment; because it has to have a light sensor because of the keyboard black light. But I would rather it didn't do it. Or is my laptop just broken?

This is usual behaviour and is drriven by the ambient light sensor. You can turn this behaviour off in the Displays System Preference.

How to change the screen brightness on a macbook?

How to change the screen brightness on a macbook?
My Macbook is a May 2010 model in white
I am looking how to change the brightness using the keyboard, because I know how to change it using System Pres

The F1 and F2 keys control brightness. Depending on how you have your function keys set up, you may have to also hold down the fn key to activate.

Screen brightness wont change

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