[lkml]   [2008]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [GIT PULL] LED updates
Richard Purdie wrote:
> On Thu, 2008-02-07 at 19:38 -0200, Henrique de Moraes Holschuh wrote:
>> On Thu, 07 Feb 2008, Richard Purdie wrote:
>>> Márton Németh:
>>> leds: Add support for hardware accelerated LED flashing
>>> leds: hw acceleration for Clevo mail LED driver
>> This one has a loose end: when you call brightness_set on a led with
>> hardware flash acceleration, you will leave the trigger armed, BUT the led
>> won't blink anymore. That's just wrong.
> Agreed.

My only question is that do you know any LED hardware which can blink _and_
can set the brightness independently? If there would be such a LED I could
imagine that the brightness can be changed while the LED remains blinking at
some low frequency. For example a simple LED with brightness set possibility and
blinking directed by software is an example where the blinking and the brightness
setting are completely independent.

I agree, however, that if the brightness is set to LED_OFF, the trigger
should be also removed.

>> Either we should always remove *any* (hardware accelerated or not!) active
>> trigger when a write to brightness_set is done, or the stuff about "calling
>> brightness_set will disable the hardware accelerated blink" has to go.
>> I personally prefer that we would always remove any active trigger if
>> brightness_set is to be called. IMHO, it is neater, and it is also the
>> least-surprise-behaviour from an user perspective with the LED_OFF:LED_FULL
>> triggers we have right now.
> Even without the hardware acceleration, a user write to set_brightness
> leaves any active trigger active and isn't really intuitive or right
> either.
>> Which one will be? If it is "remove any active trigger", I'd not mind
>> writing the patch.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2008-02-08 08:41    [W:0.108 / U:1.284 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site