[Solved] backlight not working

[djemos]

After latest upgrades i found that pressing the keys for increase or decrease screen light do nothing.
to make it work again create a file 20-intel.conf in /etc/X11/xorg.conf.d/ with the following content

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Section "Device"
    Identifier  "Intel Graphics" 
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
EndSection

Then restart X

ATTENTION: Don't do this if you don't have an intel laptop or if you running slackel openbox in Virtual machine, because system will not boot on X.
In this case just delete the file /etc/X11/xorg.conf.d/20-intel.conf

[Papasot]

Weird, my laptop is Intel-based (GPU and CPU) but still doesn't need this fix, with all updates applied, including kernel. The keys for increasing/decreasing backlight work as always.

[djemos]

mine has an intel intergated graphic card

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VGA compatible controller
product: Haswell-ULT Integrated Graphics Controller [8086:A16]
vendor: Intel Corporation [8086]
bus info: pci@0000:00:02.0
version: 0b
width: 64 bits
clock: 33MHz

Mine is lenovo g50-80

Look here others had also this problem and solved it as i say. It is nice you do not have it.
From slackware changelog Mon Jan 18 13:50:16 UTC 2021
"I'm hoping that the (probably unrelated) issues with Intel video hardware will be helped by today's
xorg-server patch that uses the modesetting driver with newer chipsets. Please
report any improvement on the LQ thread."
This caused the problems.
I think yours is old laptop and uses the old xorg drivers while mine use modesetting. So i have problems with xbacklight.