Yet another problem... Mi A2 Lite randomly throwing "Missing SD Card" error

[GuestK00302]

Thanks for the explanation of why it happens in Pie.
What remains as a mistery to me is why this didn't happen in Oreo. It never happened. Same sd card (OS and capacity), same phone hardware.
I should say that the OS update notification in January didn't state clearly an OS update to Android 9 (pie). Never crossed my mind that an OS upgrade would mess with something that was stable on the previous OS. Naive me :-S
If this a power management issue, is there a way to disable the power saving for the sd card handling?

Thanks again.

I have no idea why it didn't happen in oreo. Maybe they are careless, maybe they don't even care about changes that Pie brought to adapt to the SD Card. It's still a cheap phone so don't expect that everything software wise to be top notch. Like I said, while the device is fully capable of doing that, maybe they are cutting some corners.
Maybe the license for the SD Card support couldn't be moved from 8 to 9 and they had to skip that. I don't know, and only Xiaomi can answer that question, and they never will answer to you or me.

You were never careless to update. Pie brought many upgrades over 8. Like I said, to avoid any problems, just use the SD Card for media storage, and buy the largest known brand Class4 one and your problems will be gone. Or maybe, Android 10 will offer a better support directly from Google without needing licensing for OEMs from other 3rd party companies.

Also, no, there is no way to disable the power management for the SD cards since that power management shoud be managed by the kernel depending on what class card you have. The phone should detect the card type, and tell the kernel what card it is for it to know how to manage. Or maybe the problem comes from the CPU management. I have no idea, and only tried removing the battery saver optimizations from system which brought 0 improvement over previous state.

Have a good day, you're welcome.

 

[~Nagareboshi]

I'm havin the same issue on stock 9 (10.0.18.0). Original Sandisk Class 10 64gb as internal storage, and when I lock my A2 for a long time (some minutes), the next time I turn the screen on I have a big "missing SD card" notification. When I unlock the phone, after 1~second the notification dissapear........... I already flashed another builds of stock 9, always wiping the phone and nothing... the SD works fine on my Note 5. I've already tested with an 32gb Sandisk SD card class 10 (that I use on a monitoring camera) and nothing help, the "missing SD card" is following me. Ps: my A2 lite is brand new, bought in the beginning of the week.

This is killing me, I don't want to format as external storage because it doesn't have any protection (I had a stolen Redmi 4X that had the SD card without any protection, so the criminals had easy access to all my photos and videos just pluggin on a PC or another phone).

 

[RFD80M-75679]

I'm havin the same issue on stock 9 (10.0.18.0). Original Sandisk Class 10 64gb as internal storage, and when I lock my A2 for a long time (some minutes), the next time I turn the screen on I have a big "missing SD card" notification. When I unlock the phone, after 1~second the notification dissapear........... I already flashed another builds of stock 9, always wiping the phone and nothing... the SD works fine on my Note 5. I've already tested with an 32gb Sandisk SD card class 10 (that I use on a monitoring camera) and nothing help, the "missing SD card" is following me. Ps: my A2 lite is brand new, bought in the beginning of the week.

This is killing me, I don't want to format as external storage because it doesn't have any protection (I had a stolen Redmi 4X that had the SD card without any protection, so the criminals had easy access to all my photos and videos just pluggin on a PC or another phone).

It's the problem of stock ROM and kernel and (to me) nothing I can do with that SD card self eject problem. Custom ROMs and custom kernels did not exhibit that problem for months now in my Mi A2 Lite.

 

[~Nagareboshi]

It's the problem of stock ROM and kernel and (to me) nothing I can do with that SD card self eject problem. Custom ROMs and custom kernels did not exhibit that problem for months now in my Mi A2 Lite.

Wich cutom you use?

 

[RFD80M-75679]

Wich cutom you use?

Both POSP and SuperiorOS. Both are good.
For custom kernel, Loki, Nitrogen and Chunchunmaru kernels are better than stock.

 

[ojcu]

Just updated to Android 10 and it seems like over 32gb cards are working again.