Re: Thinkpad ACPI led -- it keeps blinking

[Jacek Anaszewski <jacek.anaszewski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi Pavel,

On 4/26/19 2:35 PM, Pavel Machek wrote:
> Hi!
> 
> Something is wrong with blinking on thinkpad
> 
> pavel@amd:~/bt/blee$ cat /sys/class/leds/tpacpi\:\:power/trigger
> [none] bluetooth-power rfkill-any rfkill-none kbd-scrolllock
> kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock
> kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock
> kbd-ctrlrlock AC-online BAT0-charging-or-full BAT0-charging BAT0-full
> BAT0-charging-blink-full-solid rfkill0 phy0rx phy0tx phy0assoc
> phy0radio phy0tpt mmc0 timer heartbeat audio-mute audio-micmute
> rfkill1 hci0-power rfkill5
> pavel@amd:~/bt/blee$ echo 1 >
> /sys/class/leds/tpacpi\:\:power/brightness
> pavel@amd:~/bt/blee$ echo 0 >
> /sys/class/leds/tpacpi\:\:power/brightness
> pavel@amd:~/bt/blee$
> 
> Trigger indicates "none" but it keeps blinking, until I echo 0 >
> brightness to stop it. I have python script to trigger this
> behaviour... it seems to work from shell.
> 
> It behaves strangely. If I ask for blinking twice, it stops blinking
> on second request.
> 
> pavel@amd:~/bt/blee$ echo timer >
> /sys/class/leds/tpacpi\:\:power/trigger
> pavel@amd:~/bt/blee$ echo timer >
> /sys/class/leds/tpacpi\:\:power/trigger
> 
> echoing none fixes it.
> 
> Kernel 5.1.0-rc1 + some unrelated bits.

Maybe this is manifestation of the possible problem we still
have in the LED core.

I once proposed a patch [0]. You could try if it changes
something in your case.

[0] https://marc.info/?l=linux-kernel&m=151622365715313&w=2

-- 
Best regards,
Jacek Anaszewski