* 3-color led too bright
@ 2016-01-30 20:07 Pavel Machek
2016-01-31 0:24 ` Sebastian Reichel
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Machek @ 2016-01-30 20:07 UTC (permalink / raw)
To: pali.rohar, sre, kernel list, linux-arm-kernel, linux-omap, tony,
khilman, aaro.koskinen, ivo.g.dimitrov.75, patrikbachan, serge
Hi!
The indicator 3-color LED in mainline kernel seem to be a bit too
bright. .. more bright to look at comfortably. I believe it is also
brighter than in original maemo... I believe I've seen note somewhere
that hardware may allow too much current to the 3-color led damaging
hardware... but I can't find the link now.
Does anyone know more?
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: 3-color led too bright
2016-01-30 20:07 3-color led too bright Pavel Machek
@ 2016-01-31 0:24 ` Sebastian Reichel
0 siblings, 0 replies; 2+ messages in thread
From: Sebastian Reichel @ 2016-01-31 0:24 UTC (permalink / raw)
To: Pavel Machek
Cc: pali.rohar, kernel list, linux-arm-kernel, linux-omap, tony,
khilman, aaro.koskinen, ivo.g.dimitrov.75, patrikbachan, serge
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Hi Pavel,
On Sat, Jan 30, 2016 at 09:07:50PM +0100, Pavel Machek wrote:
> The indicator 3-color LED in mainline kernel seem to be a bit too
> bright. .. more bright to look at comfortably. I believe it is also
> brighter than in original maemo... I believe I've seen note somewhere
> that hardware may allow too much current to the 3-color led damaging
> hardware... but I can't find the link now.
Safe current limits for the leds are configured in the DTS
(led-cur and max-cur) and can be checked in sysfs. I remember
testing the safety limits when I added them to DT, but the
driver has changed a bit since then.
-- Sebastian
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