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2012-04-16
, 12:14
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#2
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the kbd backlight is controlled via mce process and lp5523 kernel driver in /sys/class/leds/lp5523:kb?/* and engine3.
Possible hooks are:
/etc/mce/mce.ini ([KeyPad] BacklightTimeout=30) problem: mce needs a restart to read in new values from mce.ini
/sys/class/leds/lp5523:kb?/led_current
/sys/class/leds/lp5523:kb?/brightness
/sys/class/i2c-adapter/i2c-2/2-0032/engine3_mode
see http://wiki.maemo.org/N900_Hardware_LED and http://wiki.maemo.org/LED_patterns#Low_Level for details.
is accomplishing a shutdown of backlight. Alas mce will restore the default value 50 to all led_current nodes when kbd backlight gets re-enabled. This also might happen on random moments, I haven't done extensive tests.
Beware! Values >50 for led_current may instantly kill your LEDs!
Anyway I hope it helps you with some suggestions where to start.
/jOERG
[edit] ps.: please notice your kbd backlight will get turned off when ambient light is bright enough
Last edited by joerg_rw; 2012-04-16 at 13:01.
Possible hooks are:
/etc/mce/mce.ini ([KeyPad] BacklightTimeout=30) problem: mce needs a restart to read in new values from mce.ini
/sys/class/leds/lp5523:kb?/led_current
/sys/class/leds/lp5523:kb?/brightness
/sys/class/i2c-adapter/i2c-2/2-0032/engine3_mode
see http://wiki.maemo.org/N900_Hardware_LED and http://wiki.maemo.org/LED_patterns#Low_Level for details.
Code:
for L in /sys/class/leds/lp5523:kb?; do echo 0 >$L/led_current; done
Beware! Values >50 for led_current may instantly kill your LEDs!
Anyway I hope it helps you with some suggestions where to start.
/jOERG
[edit] ps.: please notice your kbd backlight will get turned off when ambient light is bright enough
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First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Last edited by joerg_rw; 2012-04-16 at 13:01.
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2012-04-16
, 13:14
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Posts: 124 |
Thanked: 125 times |
Joined on Sep 2010
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#4
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Hello to all I just have a question it would be possible just leave some of the keyboad lights on, for example; when we are using an emulator and we have the keyboard mapped just leave the mapped keys with lights on! do you guys think this possible??
Just an ideia.
Bruno
Just an ideia.
Bruno
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2012-04-16
, 13:43
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Posts: 5,028 |
Thanked: 8,613 times |
Joined on Mar 2011
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#5
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MAG did a proof-of-concept program that turned certain diodes beneath keyboard on demand (there are 6 diodes total out there), so it's probably perfecdtly achievable.
Yet, You guys are overrating effect on battery life, generated by kb diodes - they're not like backlight of screen, so don't expect noticeable powersaving, even by disabling them totally.
OZr I just don't feel it using 3000 mAh battery, which seems to be much more effective way of extending runtime
/Estel
Yet, You guys are overrating effect on battery life, generated by kb diodes - they're not like backlight of screen, so don't expect noticeable powersaving, even by disabling them totally.
OZr I just don't feel it using 3000 mAh battery, which seems to be much more effective way of extending runtime
/Estel
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N900's aluminum backcover / body replacement
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Measure battery's real capacity on-device
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N900's aluminum backcover / body replacement
-
N900's HDMI-Out
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Camera cover MOD
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Measure battery's real capacity on-device
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TrueCrypt 7.1 | ereswap | bnf
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Hardware's mods research is costly. To support my work, please consider donating. Thank You!
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2012-04-16
, 18:51
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Posts: 124 |
Thanked: 125 times |
Joined on Sep 2010
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#6
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Originally Posted by Estel
Thanks Estel, I'm not bothered with the battery consumption, I'm just interested on this concept because some times it is hard to remember which key I assigned on the emulatos, on that way would look like a proper console remote!!!
MAG did a proof-of-concept program that turned certain diodes beneath keyboard on demand (there are 6 diodes total out there), so it's probably perfecdtly achievable.
Yet, You guys are overrating effect on battery life, generated by kb diodes - they're not like backlight of screen, so don't expect noticeable powersaving, even by disabling them totally.
OZr I just don't feel it using 3000 mAh battery, which seems to be much more effective way of extending runtime
/Estel
Bruno
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2012-04-17
, 01:02
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Posts: 304 |
Thanked: 235 times |
Joined on May 2010
@ Manila
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#7
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Originally Posted by joerg_rw
thing is, i have ALS sensor disabled
[edit] ps.: please notice your kbd backlight will get turned off when ambient light is bright enough
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2012-04-17
, 18:22
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#8
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with those 6 diodes you hardly can illuminate particular keys while keeping others dark.
For Mohammad's POC (actually iirc I posted him how to do it ;-D), you simply add a
to inside the for-loop of my code snippet above ;-)
regarding power consumption: 6 * 5mA * ~2V = ~60mW
screen backlight is using up to 15 times that, iirc and my math still works
/j
Last edited by joerg_rw; 2012-04-17 at 18:28.
For Mohammad's POC (actually iirc I posted him how to do it ;-D), you simply add a
Code:
sleep 1
regarding power consumption: 6 * 5mA * ~2V = ~60mW
screen backlight is using up to 15 times that, iirc and my math still works
/j
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Last edited by joerg_rw; 2012-04-17 at 18:28.
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I want to pop out the hwkb and not have the backlight lit up, and when I need it to light up, I can easily enable it through the status-menu.
I hope it is possible. TIA!