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MrChromebox / firmware

Issue tracker for firmware issues
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Morphius/lenovo C13: No keyboard backlight #682

Open skuperuser opened 1 day ago

skuperuser commented 1 day ago

Hi there, the keyboard backlight on my Lenovo Thinkpad C13 yoga seems to be broken.

I've tried turning it on with windows & crosec shortcut and on fedora linux KDE. Linux/KDE does recognize that the laptop has a keyboard backlight, but changing the keyboard lightning slider does nothing. On top of that, the keyboard does not light up in the BIOS, if that matters.

So, I think this is most likely a firmware issue. The lighting was working just fine on rw_legacy.

My model: ryzen 3500C, 8gb ram, 128gb nvme

Are there any fixes for this?

MrChromebox commented 1 day ago

the keyboard backlight is working fine here on my C13 with 2408.1 firmware PopOS. Sounds like an OS/driver issue to me

skuperuser commented 1 day ago

Tried a few things like setting the brightness in console. i've also updated the uefi 2024.09.08>2024.09.14, cleared nvram, ran mint and popos, but it's still broken. 2024-10-01-20-01-24-129 2024-10-01-19-25-03-942 2024-10-01-19-22-01-406

2024-10-01-19-20-13-868

i've also found some others reporting this issue on the chrultrabook forums https://forum.chrultrabook.com/t/lenovo-thinkpad-yoga-c13-gen-1/420 https://forum.chrultrabook.com/t/thinkpad-c13-ryzen-5-linux-support/2894/7 (last comment)

maybe it could be specific to this hardware config?

MrChromebox commented 1 day ago

it's the same hardware config as I have here.

Setting the brightness value to 100 is less than half, the scale is 0-255.

The firmware has done its job if the chromeos kb backlight driver has attached and the controls are visible via sysfs.