[Gutsy]Brightness applet not working in Gutsy (worked in Feisty)

[Jason J. Herne]

I have an IBM Thinkpad T42 and the Gnome brightness applet does not seem to function under the Gutsy Tribe5 LiveCD or after I've installed Gutsy Tribe5. I can use the brightness keys on the Thinkpad to change the actual screen brightness but the applet does not seem to function.

This applet works perfectly with the final version of Feisty. I've been using it for months now and the applet will pop up a little window in the center of the screen when I use the Thinkpad's brightness keys to adjust the brightness. This does not happen in Gutsy.

[Nic (ntetreau)]

Same problem here with Sony SZ3XWP, nvidia card, Fn keys work fine to manually dim the monitor but the applet doesn't work, neither does the automatic dimming when I unplugged the laptop. When I do so, I can see the brightness applet appear momentarily ont he screen but the screen isn't dimmed.

[nynexman4464 (alex-alexrock)]

I have an IBM T23 with the same problem. I don't know about Feisty (I never used it because of other problems), but it was working in Gutsy a few days ago. There were some updates, and now it doesn't seem to be working. The indicator pops up, but the indicator just stays all the way at the bottom, no matter where the brightness is. At maximum brightness, continuing to press the up brightness keys will make the indicator move one notch up, but then back down again on the next press.

[Philipp Wolter (phwolter)]

I have an IBM X31 with the same problem.
With Feisty it worked perfectly.
In /proc/acpi/ibm/brightness I can read the correct level of brightness.

[Johan Van Hellemont (johan-van-hellemont)]

Same problem here with Thinkpad T43 and up-to-date Gutsy.
Brightness Applet with the red circle and the message ''Cannot get laptop panel brightness'',see screenshot.
I have no sliders in g-p-m for the brightness,see screenshot.
And the ''on screen display'' don't work anymore.
This all worked a few days ago!
When I restart hal everything works.

[arturj (arturj-freenet)]

Same problems for me with Thinkpad T43. Worked perfectly with Feisty but does not work on every gutsy version I tried so far (Tribe3, Tribe5, Beta, Final). Properties of the Powermanagement-Applet does no show a brightness-slider anymore. Brightness Applet also does not work. Only FN+Pos1/End does change brightness but without the Display. Restarting HAL does not work for me also.

[losenzos (enzo-ungersboeck)]

Same problem for me as well. I am running Gutsy on a Z61m Thinkpad. Adjusting the brightness using the brightness-applet does not work anymore, although I don't have the red circle in the applet. In Edgy or Feisty this worked fine..

However, now I can use the FN Keys to set the brightness :) This did not work using Feisty...

[losenzos (enzo-ungersboeck)]

I just found out that the applet button works again, when setting the dim property in the battery-mode to 0 % in the power-managment settings :)

[GoPool (gopool)]

This problem can be fixed in Thinkpads by doing the following. I am using an IBM T40 with Gusty by the way.

1. In the file '/etc/modprobe.d/thinkpad_acpi.modprobe' change 'options thinkpad_acpi hotkey=enable,0xffff8f experimental=1' to 'options thinkpad_acpi hotkey=enable,0xffff experimental=1 fan_control=1'

2. In the file '/etc/modules' add this line 'thinkpad_acpi hotkey=enable,0xffff experimental=1 fan_control=1'

After these changes, the brightness applet should work, there is also a display on the screen whenever the brightness level is changed, and you should also be able to see the brightness sliders in gnome-power-manager that works.

[Johan Van Hellemont (johan-van-hellemont)]

Yes this workaround works for me on my T43.
Brightness-applet,the on-screen display and the brightness sliders in g-p-m.
Thanks for this !

[arturj (arturj-freenet)]

I tried just adding 'thinkpad_acpi' to '/etc/modules' and this also seems to work for me on my T43.
Thanks for that workaround which of course works for me also.

[mezhaka (mezhaka)]

I do have that problem on Thinkpad X31

[Sitsofe Wheeler (sitsofe)]

Can this bug be reproduced in Ubuntu 10.04?

[smith (smith-gss)]

I have the same problem on Ubuntu 10.04LTS running on Toshiba satellite laptop.

[rusivi2 (rusivi2-deactivatedaccount)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. I noticed that the package version your bugging is updated in Maverick. Please update via www.ubuntu.com repost a detailed error report, and update the bug status. Thanks!

[Launchpad Janitor (janitor)]

[Expired for gnome-power-manager (Ubuntu) because there has been no activity for 60 days.]