cinnamon: Brightness applet and keys stop working

[Rockets31]

In LM-20.3 it is possible setting "real" 1%-brigthness value and the slider works direct & smoothly, in LM-21.1 it "jitters". What about adding a configuration-menu for changing slider-steps (applet.js: line 196 & line 223: "this._step = .01;"). This works pretty good in LM-20.3 power-applet and brightness-keys always work, so one also could turn backlight on/off!

1. Observation:

Brightness-slider of power-applet disappears after cinnamon-restart & Brightness-keys won`t work anymore (running on notebook)

2. Expectation:

Brightness-slider should not disappear, but shows correct brightness-value

3. Reproduction:

a. Set brightness-slider by power-applet to "Brightness: 0%"

b. Go to "sys/class/backlight/intel_backlight" (Intel-card) or "sys/class/backlight/acpi_video0" (ATI-card)

c. Open "actual_brightness" file and notice actual-brightness-value

d. Open "max_brightness" file and notice maximum-brightness-value

e. Divide actual-brightness-value by maximum-brightness-value: 0,02 = 2%

f. Calculate brightness-value for 1%:

Divide max_brightness-value by 100 -> you got brightness-value for 1%, e.g. "240"

g. Set 1% brightness-value by terminal:

sudo -s

echo 240 > /sys/class/backlight/intel_backlight/brightness   #Intel-card

echo 240 > /sys/class/backlight/acpi_video0/brightness       #ATI-card

h. Restart Cinnamon

i. Click power-applet by left-mouse-button: Brightness-slider is gone & Brightnes-key won't work anymore

[clefebvre]

The applet won't let you go below 2%. That's by design. On some computers this actually turns the screen completely off and the user can't see anything anymore. So the applet's 0% is actually 2% of real brightness.

Anyhow, there's another issue at play here apparently. I assume something is crashing for the applet not to show up and the brightness keys not to react. Can you check the Cinnamon logs in ~/.xsession-errors, as we all Looking Glass logs (Alt-F2, then type lg, then type enter, then click on Log).

And last but not least, I'd like to know if csd-power is still running:

ps -ef | grep csd-power

[clefebvre]

I'm marking this to be fixed later and closing it. Please continue to provide feedback though. This will be looked at post-release.

[Rockets31]

Here i got some information for you. I booted into LM-21.1, set brightness to 1%-percentage, restarted cinnamon and "ps -ef | grep csd-power":

~$ sudo -s

echo 240 > /sys/class/backlight/intel_backlight/brightness

ps -ef | grep csd-power

rocket 1359 1071 0 15:19 ? 00:00:00 csd-power root 2242 2064 0 15:25 pts/1 00:00:00 grep --color=auto csd-power

xsession-errors-log: xsession-errors.txt

Melange-Log: melange-log.txt

I think, he is complaining about minimum-limitation of 2%-percentage - kind of a "out of boarder" error... Have fun :-)