The notification of brightness change miss icons in xfce4

[twime]

1.When I press fn key to control brightness level,there are only one tiny line on notification windows without icons.
2,The change of brightness level is slow using FN key.

[fabalthazar]

Hello,

I think that I have the same problem. Just to be sure, my brightness notification looks like the one shown here (tiny box under the volume notification):
http://askubuntu.com/questions/451096/brightness-notification-on-xubuntu-shrunk-after-update

This problem appeared since the 4.10 to 4.12 stable Xfce4 update.
I have two graphics cards on my system: discrete Nvidia and integrated Intel, with the Optimus technology.

Since the update mentionned above, xfce-power-manager comes with upower, which I think makes several interfaces to backlight devices in /sys/class/backlight. In my case, I have these three ones:

[nshibalov]

Hi, i have same problem, brightness notification looks exactly like in the link.
Additional information is then i run xfce4-power-manager --no-daemon --debug --dum and press brightness button, there is warning:

[fabalthazar]

Hi,
Do you have a multi-GPU system (eg. Intel+Nvidia/Intel+AMD)?
(To see if this depends on multi-GPU systems and xfce-power-manager).