gutsy: g-p-m 2.19.6-0ubuntu4 breaks brightness control

[Nikolaus Filus]

Binary package hint: gnome-power-manager

gnome-power-manager 2.19.6-0ubuntu4 introduces a regression from 2.19.6-0ubuntu2
as it breaks brightness control. On my Samsung P35 when g-p-m is running it sets the brightness
to minimum and I'm no longer able to change it. Every keypress of brightness-up goes 1 level up and
down, staying the same level. Downgrading back to 2.19.6-0ubuntu2 makes it work again.

[Nicolò Chieffo (yelo3)]

Same problem here, attaching a debug when pressing the brightness button 3 times

[Juan Pablo Salazar Bertín (snifer)]

Bug #136693 and its duplicate have been added as duplicates of this bug. You can find more info about this issue there.

[Juan Pablo Salazar Bertín (snifer)]

The patch applied in g-p-m version 2.19.6-0ubuntu3 fixes bug #130274, which is MacBooks users getting the same behaviour as us, but at the same time it breaks g-p-m for other users.

I think a better thing to do is to replicate what is being done upstream <http://news.gmane.org/find-root.php?group=gmane.comp.freedesktop.hal&article=8454>.

[Juan Pablo Salazar Bertín (snifer)]

This has been fixed for me with hal version 0.5.9.1-1ubuntu7.
Please confirm.

[elyk (elyk53)]

Fixed for me too. Thanks

[Alexey Borzenkov (snaury)]

Fix confirmed, thanks a lot!

[junk123 (junk123-deactivatedaccount-deactivatedaccount)]

Bug seems to be back, anyone else?

[elyk (elyk53)]

I've got a similar bug occurring again, but it's not exactly the same - the down key increments properly one step at at time now, whereas before one press would send the brightness all the way down to the lowest setting. But the up key still is displaying the same behavior

[elyk (elyk53)]

Bug has returned, so fix is no longer valid

[Juan Pablo Salazar Bertín (snifer)]

It's a new bug, there are some reports like bug #140839 and bug #140572, and probably bug #117327.

In my case, this time g-p-m is using 6 as the unit to add/subtract to current brightness level. According to acpi, my brightness possible levels are: 12 24 36 48 60 72 84 100. So, if I'm at 100, then g-p-m subtract 6 and sets 94, I end up at 84 (the next level below), but when g-p-m adds 6 to 84 and sets 90, I'm still at 84, since I need 100 to be at the next level.

[Juan Pablo Salazar Bertín (snifer)]

Bug has not returned, it's a different bug.

[Nikolaus Filus (nfilus)]

g-p-m is very broken in gutsy - no matter what version.
Since I upgraded to gutsy, there are a lot of regressions I see, which seem to
be confirmed by a lot of people.
FYI: Currently I'm using
  hal 0.5.9.1-1ubuntu8
  gnome-power-manager 2.20.0-ubuntu1

For my above reported bug I had to delete the gconf subtree of g-p-m to get the
fix working during an ongoing session. This issue has gone away, but ...

 - "dim display when idle" IS OFF, but I see brightness go down to 0% and back to 100% when idle
 - on first login after startup g-p-m consumes 100% CPU and my display
   is rapidly flashing showing a brightness around 50%.

... and most annoying is, that after killing g-p-m for restoring a sane state, I can't logout or suspend
anymore, as the quit action in Gnome seems to rely on a running g-p-m.

The state gnome-power-manager is unusable and there are 252 bugs open currently. How can such a piece
of broken software be released?

[junk123 (junk123-deactivatedaccount-deactivatedaccount)]

Anyone know the status on this its still not working

[Jarrod Henry (jarrodhenry)]

I think I am seeing a duplicate of this bug as well. When off AC, I adjust the brightness, however, the "Dim to" takes over and down adjusts my brightness. This happens irregularly, though.. sometimes it stays bright the whole time.. sometimes it goes down.. sometimes it goes to a lower point than what the "dimmer" was set to.

Machine is a Dell Inspiron E1405.

[Boris Kairat (boris-g-kairat)]

Confirm: On the first login after startup g-p-m consumes 100% CPU and my display is rapidly flashing (going up and down) showing a brightness around 50%.
Is this problem solved yet?
I am using a P35III with gpm: 2.20.0-0ubuntu6.

[Boris Kairat (boris-g-kairat)]

I had a clean install an hour ago.
Problem still exists.

Version: 7.10 (gutsy)
Kernel Linux 2.6.22-14-rt
Gnome 2.20.0

I NEED A FIX! PLEASE! :-)

[kpictjl (todlarson)]

Problem confirmed. Gnome Brightness applet says "Cannot get laptop panel brightness."
gnome-power-manager v. 2.20.0
kernel: 2.6.22.14-generic
Ubuntu 7.10

[Jan Hlodan (wewek)]

Ubuntu 9.04 32-bit
2.6.28-11-generic

The issue still persists. The display is flashing and power-manager doesn't work correctly - it changes brightness into darkness sometimes.
Also "func" + "F10/F11" doesn't work.

Lenovo 3000 C200