[Letux-kernel] Modem disappears GTA04A4

Andreas Kemnade andreas at kemnade.info
Sun Jan 20 21:29:39 CET 2019

On Sun, 13 Jan 2019 23:28:35 +0100
Jake <jake42 at rommelwood.de> wrote:

> Hi,
> I'm experiencing a problem with the modem disappearing on GTA04.
> For example when writing text messages to and fro with suspends in
> between it happens at times, that the modem /dev/ttyHS* files
> disappear. The modem is still unblocked in rfkill. 
> I don't have any logs yet. I usually powered off the GTA04A4, removed
> the battery for a few seconds, reinserted and booted again to continue
> the conversation as soon as possible.
> How can I toggle the gpio 186? to reenable the modem manually?
> My observations so far:
> 4.19-rc7: modem disappears sporadically
> 4.19.12: modem disappears sporadically
> 4.20: does not wake on incoming call/text

can reproduce this. The corresponding event device works, but wakeup 
does not work. Ruled out: dtb changes. Will do further research.

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