.. include:: ../defs.txt

.. _librem_5_known_issues_birch:

Birch
=====

This page contains the known issues for the Birch shipment of phones as supplied to users.

 * When charging the phone using a charger, 12V negotiation and rapid charging can fail.
   |gap|
   To help prevent this, follow these step to charge the phone:
      * Unplug the power adapter (wall wart) from the power outlet.
      * Plug one end of the USB-cable into the adapter and the other end into the phone.
      * Plug the adapter into the power outlet.
   |gap|
   When unplugging:
      * Unplug the adapter from the power outlet first.
      * Then unplug the USB-C cable from the phone.
   |gap|
   If this failure occurs, USB 2.0 data transmission can also be affected. This failure mode does not affect 5V charging over a USB type-C to USB type-A cable.

 * After being powered down, the phone can be difficult to power up again.

   The solution is to unplug the USB cable, then press the power button for 15-18 seconds.

   This problem is related to a software issue: `Power Button Not Turning Device Back On <linux-next-109_>`_
   |gap|

 * Call audio routing is not functioning completely.

   This issue will be fixed in an upcoming system update.
   |gap|

 * The battery installed in the phone is labelled with a capacity of 2000 mAh.

   This is a conservative estimate of the capacity. Later iterations of the phone should have higher capacity batteries.
   |gap|

 * Power management and heat issues are caused by various subsystems. The processor will be run more slowly to prevent overheating, affecting processing performance.
   |gap|

 * The phone may sometimes restart when turning the modem on using the kill switch.

   This depends on the modem in use. BroadMobi BM818-A1/E1 modems do not seem to be affected.
   |gap|

 * The phone may restart if you remove or insert the SIM card while it is powered.

   This is due to the type of SIM tray in use. **Users should power off the phone before replacing SIM cards.**
   |gap|

 * Any installed microSD card can only be read from and not written to. This will be fixed in a future software update.
   |gap|

 * Activation of rapid charging depends on whether the TPS65982 power controller is first powered via USB or via the battery.
   |gap|

 * Rapid charging is currently not possible over a USB A to C cable due to a software issue: `BQ25895: Disable BC1.2 and Set IINLIM to Max Value <linux-next-135_>`_
