[LG Optimus L9 P760, P765, P768, P769] AntonX:
Notes

Storage

Originally our phone has very awkward, confusing, and often misunderstood configuration for external storage. Why all these strange emulated directories with cryptic numbers? Well, the numbers are needed for multiuser environment but we don't care about it as on phones it's not enabled. It appears that there is internal /sdcard (or /storage/sdcard0 which is the same) and everybody is welcome to store data on it. Truth of the matter is - there is no dedicated internal sdcard on our phone. There in no separate microchip, no separate partition, the internal sdcard does not exist. It is emulated by FUSE inside /data partition. The original location of files is /data/media/0 and /sdcard just simulates a drive from this directory. It means that every time you save anything to /sdcard, the space will be taken away from /data. Even worse, all apps think that /sdcard is real external storage and will dump data there. Very soon you will find that you've run out of space in /data and cannot install apps anymore. This configuration would have worked fine if we had big internal MMC card but unfortunately ours is quite small. So the best practice is not to use /sdcard at all and keep it as empty as possible. But if it's better not to use it, why even have it?

This ROM completely removes emulation of internal sdcard. There is only single /sdcard0 now and it is mounted to your real external SD. Android and all apps see it properly as external storage. There are no problems anymore with space hungry apps like big games. All downloads will go to the external SD as expected. Apps2SD works seamlessly because storage not emulated. The whole configuration is much more straightforward and easier to work with.

If you have files previously stored on /sdcard0, they are still accessible from /data/media/0, but it is better to move them from there to free space in /data.

If you have installed RemountSD or similar, uninstall it, you don't need it anymore.

If after updating to not-emulated ROM you find that the Camera does not store pictures, just clear its data in Android Settings->Apps->All->Gallery (yes, Camera is part of Gallery.)

Audio Amplifier Analog Gain

Controlling amplifier gain allows to play music both louder (+12dB) at high volumes and clearer at low volumes. The gain adjustment can be found in Android Advanced settings.

The included twl6040 kernel driver also simulates Wolfson wm8994 Voodoo Sound extension for headset amplifier. If Voodoo Sound is installed and Smart Amplifier is enabled, the amplifier gain will be controlled together with the volume. This maintains optimal Signal-to-Noise ratio at low volumes.

Voodoo Sound app shows incorrect range of levels: -57dB..+5dB. In fact our amplifier range is -30dB..0dB in 2dB steps. This discrepancy does not affect the functionality.

The amplifier returns to default gain upon a call or any other microphone activity. After the microphone activity is finished the gain control is re-enabled.

The kernel also supports controlling microphone preamplifier gains. The gain can be adjusted for certain scenarios, for example lowered to capture loud audio during concerts. Camera is using SUB microphone.

BLN

BLN will consume some battery when a notification is in progress. For the the touch LEDs to be lit our phone has to be awake, otherwise the power to the controller goes down and the LEDs turn off. In order to conserve the battery the kernel implements only blinking notifications. The kernel will hold a wakelock only during the short LEDs-On phase and release it when LEDs are Off letting the phone go back to sleep. Native BLN blinking is disabled.

BLN can be enabled either with neldar's app (his paid version supports scheduling) or in the Advanced Settings.