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mate-desktop / mate-power-manager

Power management tool for the MATE desktop
https://mate-desktop.org
GNU General Public License v2.0
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brightness does not return to value set by the function keys on battery #187

Open g7alt opened 8 years ago

g7alt commented 8 years ago

On Mate 1.12, Linux Mint 17.3, and Ubuntu MATE 16.04

  1. When on battery screen brightness drop to 50%, whick is okay.
  2. After that I increase brightness with function keys to say 80%, which works ok.
  3. After the screen dims, it returns back to 50% again but not 80% ie: the value set by the function keys.
  4. If I disable "reduce backlight brightness" on battery and set brightness with the command gsettings set org.mate.power-manager brightness-ac 80 then after dimming it returns to the value I set. So I think it reads the brightness-ac value when to restore brightness after dimming. So function keys aren't writing the brightness value at all.

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snugglej commented 8 years ago

I have the same problem but I also have a backlight on my keyboard. When I turn off the backlight on the keyboard and the system goes to dim the screen using the mate power-manager and then un-dim it will cause the backlight on the keyboard to also come back to the powered on state value of 1 even if it was off or at the state value of 2.

g7alt commented 8 years ago

Checked out Linux Mint 18 with Mate 1.14, same behaviour there too. This is a critical feature on a laptop.

quite commented 7 years ago

I am here for the keyboard backlight issue. I could not find any way to turn it off in the Mate control panel, but did it the hard way by echo 0 >/proc/acpi/ibm/kbdlight (on this Thinkpad T450s). But, it doesn't stick. Kbdlight goes back on again typically after graphical login, after re-login to locked screen, and after activating an idle-dimmed screen.

simonsaysthis commented 7 years ago

@quite I use a Thinkpad T460s, don't you also have the issue with brightness. I am facing both, keyboard backlight and brightness. I wish somebody had a permanent fix for this so I could use Mate instead of Unity

quite commented 7 years ago

Quite possibly I would, but I don't use any kind of feature that dims brightness (on battery mode or otherwise), and I tend not to adjust the brightness in any manual way. (I just have DPMS turn off the display when 30m or so idle).

For reference, this issue is also discussed here:

https://bugzilla.redhat.com/show_bug.cgi?id=1348156 https://bugs.launchpad.net/dell-sputnik/+bug/1510344

simonsaysthis commented 7 years ago

I wish somebody would look at this and provide a fix. I have submitted bug requests but they are not being confirmed.

g7alt commented 6 years ago

This bug is still valid on Mate 1.18.

simonsaysthis commented 6 years ago

Yeah. The gift that keeps on giving

mladenradev commented 6 years ago

Mint 19 Mate - issue still there....

simonsaysthis commented 6 years ago

I don't think this will ever be fixed, to be honest. Been like that for years now.