Mic/Volume Mute leds on Thinkpad X1 Yoga 3rd-gen

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Hi all,
I've recently upgraded my kernel from 4.17.19 to 4.19.9 and volume/mic mute leds stopped working. If I enable volume_control=1 and volume_capabilities=1 kernel parameters of thinkpad_acpi module, using 'mute' command on /proc/acpi/ibm/volume interface, leds switch on/off correctly, but if I press mute switches, while the muting happens at soundcard level, leds remain switched off.

I've reverted to old kernel, but I'm available for any testing that can help solve the problem.

--
Giacomo Cariello

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