Comments (4)
What are your other devices (as listed by brightnessctl -l)?
I remember solving similar issues (though on different hardware) by appending acpi_backlight=vendor
or acpi_osi=Linux
to kernel cmdline (YMMV).
from brightnessctl.
Here's the entire output
Available devices:
Device 'intel_backlight' of class 'backlight':
Current brightness: 1049 (98%)
Max brightness: 1060
Device 'tpacpi::thinkvantage' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 255
Device 'tpacpi::standby' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 255
Device 'tpacpi::kbd_backlight' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 2
Device 'input3::scrolllock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input3::capslock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'tpacpi::thinklight' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 255
Device 'input3::numlock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'phy0-led' of class 'leds':
Current brightness: 1 (100%)
Max brightness: 1
Device 'tpacpi::power' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 255
from brightnessctl.
Have you tried these workarounds? https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Diagnostic_Techniques
from brightnessctl.
Probable duplicate of #63
from brightnessctl.
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from brightnessctl.