[APP] LevelSight 1.1.0.2 2009.09.16 - backlight enhancement for Acer 900s and HTC

[NuShrike]

Originally Posted by Vladimyr But i had default backlight level set on 4! Thus, when ambient illumination was dropping under level 3, auto-backligh was turned off and backlight was increased to 4 Not i set default level to 2 and all is working well!

I'm glad you found the issue!

You have a good point actually. Backlight shouldn't go above the level where it was turned off at. I'll put that in the next build.

[noellenchris]

the program works great....

however on soft reset, the service is not started...if i reinstall ten it starts again...verified w/task manager & viewing details of the service.exe file....

how can i make the service start after reset?

[NuShrike]

Originally Posted by noellenchris however on soft reset, the service is not started...if i reinstall ten it starts again...verified w/task manager & viewing details of the service.exe file....

Thanks for the bug report! Looks like the service is failing a certificate security check during boot.

Quick workaround posted to use a bootloader exe in the startup folder to flip the service on since this path doesn't have a cert/trust problem. Tested and works for me.

[lotion]

Originally Posted by NuShrike Quick workaround posted to use a bootloader exe in the startup folder to flip the service on since this path doesn't have a cert/trust problem. Tested and works for me.

This also works for me. A quick google search claims the service needs to be signed in order to start with the OS.

[noellenchris]

Originally Posted by lotion This also works for me. A quick google search claims the service needs to be signed in order to start with the OS.

works now for me...thanks a ton, I like to read stuff on my phone before I go to bed, now it's not so bright!

[DeepThought]

Seems to work for me now too! Thank you NuShrike!

[DeepThought]

One minor "problem" tough. When I turn on my device it starts at light level 1 and it takes about 5 seconds before it's adjusting to the environment and turning the backlight to a higher value. Is it possible to shorten this time or to set the backlight to high on turning on?

[NuShrike]

Originally Posted by DeepThought One minor "problem" tough. When I turn on my device it starts at light level 1 and it takes about 5 seconds before it's adjusting to the environment and turning the backlight to a higher value. Is it possible to shorten this time or to set the backlight to high on turning on?

Hey, I'm glad it's working for everybody now too.

Yes, the response time is a bit slow in order to keep it from flipping bright and dark rapidly due to the high inaccuracy of the sensor at low levels and the hysteresis being pretty simple.

It's supposed to immediately turn back to auto if the auto-system wants backlight 4 because of the environment.

I can add a tunable to make the history tracking adjustable (it's at 4 points * 3 seconds now), but I rather read up on some fuzzy-logic and get this right.

[NuShrike]

Advanced sensory-data filtering using a history-less first-order low-pass filter with a medium α implemented. Previously, it was an integer-based running-average that required a 3-4 point memory history.

The new algorithm requires < 1.0 floating-point resolution so a custom fixed-point math library with DSP-acceleration is now used plus the actual filter equation was recoded directly in assembly for speed, just for fun.

Functionality that detected large and fast swings in sensor-data temporarily dropped because the filter's medium α duplicates some of the sensitivity.

Also, direct backlight power-state tracking (idea borrowed from Lumos) naively implemented to just avoid sensor-data calculations and adjustments for that poll loop without any visible affect on power-draw. It could affect the ability to adjust to light-levels deterministically, but this is a .0 release so the filter-equation can still use some tweaking.

[NuShrike]

Originally Posted by DeepThought One minor "problem" tough. When I turn on my device it starts at light level 1 and it takes about 5 seconds before it's adjusting to the environment and turning the backlight to a higher value. Is it possible to shorten this time or to set the backlight to high on turning on?

New edge detection of power-state changes in the backlight. Meaning, this should address the delay you talked about.