Hello, After update to Debian Stretch, I'm having problem with function keys on T440s. On Jessie, everything worked out of the box, but now volume up and down, screen brightness and mic mute don't work. Sound mute work, but only partialy. Led indicator doesn't turns on and it just mute the sound, it doesn't toggle it, like before.
$ cat /proc/acpi/ibm/volume level: unsupported mute: off thinkpad_acpi is loaded. lsmod |grep thinkpad thinkpad_acpi 86016 1 nvram 16384 1 thinkpad_acpi snd 86016 15 snd_hda_intel,snd_hwdep,snd_hda_codec,snd_timer,thinkpad_acpi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek,snd_pcm rfkill 24576 7 bluetooth,thinkpad_acpi,cfg80211 video 40960 2 thinkpad_acpi,i915 Here is dmesg: dmesg | grep thinkpad [ 10.656995] thinkpad_acpi: ThinkPad ACPI Extras v0.25 [ 10.656996] thinkpad_acpi: http://ibm-acpi.sf.net/ [ 10.656997] thinkpad_acpi: ThinkPad BIOS GJET82WW (2.32 ), EC unknown [ 10.656997] thinkpad_acpi: Lenovo ThinkPad T440s, model 20ARS08L01 [ 10.657606] thinkpad_acpi: radio switch found; radios are enabled [ 10.657708] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver [ 10.657709] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default... [ 10.659307] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked [ 10.660120] thinkpad_acpi: rfkill switch tpacpi_wwan_sw: radio is unblocked [ 10.665657] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input8 So, it seams that thinkpad_acpi disables the brightnes control. xbacklight doesn't work either. $ xbacklight -get No outputs have backlight property $ ls /sys/class/backlight/intel_backlight/ actual_brightness bl_power brightness device max_brightness power subsystem type uevent I tried various kernel options: acpi_osi="Linux" thinkpad-acpi.brightness_enable=1 acpi_osi="!Windows\ 2012" video.use_native_backlight=1 acpi_backlight=vendor acpi_backlight=video acpi_backlight=native acpi_backlight=none in all combinations, without success. I also tried linux-image-4.11.0-0.bpo.1-amd64 kernel, but still no joy. Tried old kernel, 3.16.0-4, too, but this time it didn't work either. I'm using 4.9.0-3 at the moment. Any idea what could be wrong? Thanks!
