What is this brightness popup?

inspiration · 2014-09-24 19:33:02

I've noticed that with kernel 3.14 I get this popup (see below) I'd never seen before as I change the brightness on my laptop. In v. 3.2, the actual brightness still changes but there is no popup.

So it made me wonder: has this popup been around for everyone else but didn't show up for me because of some bug in the kernel specific to my hardware? And is this a Crunchbang image?

(I don't mind the popup much, though I sort of prefer it not be there. I mean, if I'm changing the brightness, I can obviously see. I can see my screen getting brighter or dimmer. Why do I need another visual indicator that I am doing this? It's not like volume where I don't know for sure how loud the sound playing is supposed to be.)

porkpiehat · 2014-09-24 20:01:11

How did you get a 3.14 kernel (what exact procedure did you use to upgrade the kernel) and what else was updated/upgraded when you upgraded the kernel? And may I ask why you upgraded the kernel (was it to fix some other problem)?

Last edited by porkpiehat (2014-09-24 20:02:12)

inspiration · 2014-09-24 20:23:25

I believe it was like this:

sudo apt-get update
sudo apt-get -t wheezy-backports install linux-headers-3.14-0.bpo.2-amd64
sudo apt-get -t wheezy-backports install linux-image-3.14-0.bpo.2-amd64

And my /var/log/apt/history.log file reports:

Upgrade: initramfs-tools:amd64 (0.109.1, 0.115~bpo70+1)
Install: linux-compiler-gcc-4.6-x86:amd64 (3.14.15-2~bpo70+1, automatic), linux-kbuild-3.14:amd64 (3.14-1~bpo70+1, automatic), linux-headers-3.14-0.bpo.2-common:amd64 (3.14.15-2~bpo70+1, automatic), linux-headers-3.14-0.bpo.2-amd64:amd64 (3.14.15-2~bpo70+1)

Then when grub starts up, I made sure this version was selected.

And I upgraded it because I thought it might fix another error, which is that when I execute "xset b off" to disable the system bell/PC speaker beep, it works fine until I suspend and then resume my laptop. No luck on that, but it appears to be a known bug.

Last edited by inspiration (2014-09-24 20:39:29)

inspiration · 2014-09-24 20:42:27

Anyway, I don't really need help to FIX this (like I said, I don't mind it too much). I was mostly just curious if other #! users already get this popup when they change brightness.

Head_on_a_Stick · 2014-09-24 21:53:25

I'm going to take a wild guess here & say it relates to the contents of /sys/class/backlight/ -- check with the live version of #!
Your install will have an extra folder, the popup probably parses the new folder & not the original...
The notification itself is from xfce4-power-manager, I think.

inspiration · 2014-09-24 22:48:20

Well I don't know why it changed exactly (HoaS, I don't have the #! live ISO), but the image does appear to come from xfce4-power-manager. I have found that if you run

xfconf-query -c xfce4-power-manager -n -t bool -p /xfce4-power-manager/show-brightness-popup -s false

then after logout the popup will be gone. Replace "false" with "true" to get it back.

Haven't tried these settings in v3.2 of the kernel, but I suspect you are right HoaS. There are two folders -- acpi_video0 and intel_backlight -- in /sys/class/backlight/ but I'm not sure if this is normal or not.

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#1 2014-09-24 19:33:02

What is this brightness popup?

#2 2014-09-24 20:01:11

Re: What is this brightness popup?

#3 2014-09-24 20:23:25

Re: What is this brightness popup?

#4 2014-09-24 20:42:27

Re: What is this brightness popup?

#5 2014-09-24 21:53:25

Re: What is this brightness popup?

#6 2014-09-24 22:48:20

Re: What is this brightness popup?

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