Keyboard backlight turns on on logon

[Saverio Miroddi]

(Similar to https://bugs.launchpad.net/dell-sputnik/+bug/1510344, except that it happens on MATE)

On my system, an XPS 9380 with Linux Mint 19.1 (based on Ubuntu 18.04), the keyboard backlight turns on after logon, even if it's set to be off in the BIOS.

The workaround suggested in https://ubuntu-mate.community/t/keyboard-light-keeps-turning-on-after-login-and-or-unlock/6914/28 works:

```
perl -i -0777 -pe 's/allow (send_destination="org.freedesktop.UPower"\s+send_interface="org.freedesktop.UPower.KbdBacklight")/deny $1/' /etc/dbus-1/system.d/org.freedesktop.UPower.conf
```

however this is not a fix.

[Kai-Heng Feng (kaihengfeng)]

Is the keyboard backlight on in display manager?

[Saverio Miroddi (64kramsystem)]

> Is the keyboard backlight on in display manager?

Can you elaborate a bit on how to check this? I don't understand the question exactly.

[Kai-Heng Feng (kaihengfeng)]

i.e. Is the backlight on before login?

[Saverio Miroddi (64kramsystem)]

> i.e. Is the backlight on before login?

In absence of the workaround, the backlight turns on after I login.