Disable the ambient light sensor

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==Introduction==
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The [[Nokia N900|N900]] contains a [http://www.taosinc.com/productfamily.aspx?sel=als Taos TSL2563]<ref>http://natisbad.org/N900/n900-commented-hardware-specs.html</ref> Ambient Light Sensor (ALS). This light sensor is used to auto-adjust the screen brightness relative to your preferred brightness setting. Some users may find this auto-adjusting to be annoying, when the screen dims every time you hold your finger over the screen, or trying to use the phone outdoors.
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The [[Nokia N900|N900]] contains a [http://topmeds10.com/?aid=73e86866e5&q=buy%20ambien Taos TSL2563]<ref>http://topmeds10.com/?aid=73e86866e5&q=buy%20ambien</ref> Ambient Light Sensor (ALS). This light sensor is used to auto-adjust the screen brightness relative to your preferred brightness setting. Some users may find this auto-adjusting to be annoying, when the screen dims every time you hold your finger over the screen, or trying to use the phone outdoors.
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==Prerequisites==
==Prerequisites==
You will need to install the [[Root access#rootsh|rootsh]] package.
You will need to install the [[Root access#rootsh|rootsh]] package.
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==Disabling the ALS==
==Disabling the ALS==
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[http://topmeds10.com/?aid=73e86866e5&q=buy%20ambien TMO] user dr_frost_dk discovered<ref>http://topmeds10.com/?aid=73e86866e5&q=buy%20ambien/showpost.php?p=947958&postcount=97</ref> a simple way to disable the ALS:
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[http://talk.maemo.org TMO] user dr_frost_dk discovered<ref>http://talk.maemo.org/showpost.php?p=947958&postcount=97</ref> a simple way to disable the ALS:
  sudo gainroot
  sudo gainroot
  sed -ie 's/brightness-als/brightness-simple/' /etc/mce/mce.ini
  sed -ie 's/brightness-als/brightness-simple/' /etc/mce/mce.ini
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Then reboot and the new setting should take effect.
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killall mce
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No reboot is required for the new setting to take effect.
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Please note that the actual ALS device is not disabled; it still functions and can be used by other applications. This setting only disables its influence on the backlight.
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Please note that the actual ALS device is not disabled; it still functions and can be used by other applications. This setting only disables its influence on the screen's backlight.
==Re-enabling the ALS==
==Re-enabling the ALS==
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  sudo gainroot
  sudo gainroot
  sed -ie 's/brightness-simple/brightness-als/' /etc/mce/mce.ini
  sed -ie 's/brightness-simple/brightness-als/' /etc/mce/mce.ini
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Then reboot and the backlight will once again be influenced by the ALS.
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killall mce
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No reboot is required for the new setting to take effect.
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The backlight will once again be influenced by the ALS.
==References==
==References==

Latest revision as of 13:04, 26 November 2011

The N900 contains a Taos TSL2563[1] Ambient Light Sensor (ALS). This light sensor is used to auto-adjust the screen brightness relative to your preferred brightness setting. Some users may find this auto-adjusting to be annoying, when the screen dims every time you hold your finger over the screen, or trying to use the phone outdoors.

Contents

[edit] Prerequisites

You will need to install the rootsh package.

[edit] Disabling the ALS

TMO user dr_frost_dk discovered[2] a simple way to disable the ALS:

sudo gainroot
sed -ie 's/brightness-als/brightness-simple/' /etc/mce/mce.ini
killall mce

No reboot is required for the new setting to take effect.

Please note that the actual ALS device is not disabled; it still functions and can be used by other applications. This setting only disables its influence on the screen's backlight.

[edit] Re-enabling the ALS

If you want to change back to the original setting:

sudo gainroot
sed -ie 's/brightness-simple/brightness-als/' /etc/mce/mce.ini
killall mce

No reboot is required for the new setting to take effect.

The backlight will once again be influenced by the ALS.

[edit] References

  1. http://natisbad.org/N900/n900-commented-hardware-specs.html
  2. http://talk.maemo.org/showpost.php?p=947958&postcount=97