EMUI 9.1 update - all notifications late or not appearing - Huawei Mate 10 Questions & Answers

I know this is a topic existing over internet, I've googled it extensively, but up to now I haven't found a solution.
I've got a non-pro Mate 10, the Chinese version AL-00, rebranded to International/Global ALP L-29.
Approximately two to three weeks ago I got an update from 9 to EMUI 9.1, and maybe a week later, another update as a security patch. The current version of the software is 9.1.0301 (C636E2R1P12).
After the system update, I normally updated all the apps that needed updating and cleaned the phone's cache from bootloader. And although now I once again receive notifications from Google play when an app needs updating (I stopped receiving those a while back for an unknown reason), I stopped receiving notifications for virtually any messaging service or social network, including Gmail app.
To be more specific, when using Gmail, Facebook Messenger, Viber, Whatsapp LinkedIn or some other, I do not get notified of new messages/posts/emails whatever, UNLESS I am using the phone at that particular moment, or unless I am using that specific app at that moment. That also applies for my bank's custom app which should normally notify me instantly as soon as some expense occurs on my card. A few times it even happened that I would receive and reply to a FB message, close the app and like an hour later would receive a notification that that specific person messaged me.
This only started happening after that last update.
I tried turning off battery optimization for each and every single of those apps, I tried switching App launch to manual. It literally makes no difference. Force stopping and cleaning the cache of the apps doesn't help as well.
While I could live with it when it comes to FB or LinkedIn, I cant have Gmail or FB Messenger holding my messages for so long without notifying me. I need them for my work and sometimes time is of the utmost essence.
Any help or advice would be greatly appreciated
EDIT: I just noticed that I'm having same problems with Google Keep app when using reminders
Please, guys, help!

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neverone said:
I know this is a topic existing over internet, I've googled it extensively, but up to now I haven't found a solution.
I've got a non-pro Mate 10, the Chinese version AL-00, rebranded to International/Global ALP L-29.
Approximately two to three weeks ago I got an update from 9 to EMUI 9.1, and maybe a week later, another update as a security patch. The current version of the software is 9.1.0301 (C636E2R1P12).
After the system update, I normally updated all the apps that needed updating and cleaned the phone's cache from bootloader. And although now I once again receive notifications from Google play when an app needs updating (I stopped receiving those a while back for an unknown reason), I stopped receiving notifications for virtually any messaging service or social network, including Gmail app.
To be more specific, when using Gmail, Facebook Messenger, Viber, Whatsapp LinkedIn or some other, I do not get notified of new messages/posts/emails whatever, UNLESS I am using the phone at that particular moment, or unless I am using that specific app at that moment. That also applies for my bank's custom app which should normally notify me instantly as soon as some expense occurs on my card. A few times it even happened that I would receive and reply to a FB message, close the app and like an hour later would receive a notification that that specific person messaged me.
This only started happening after that last update.
I tried turning off battery optimization for each and every single of those apps, I tried switching App launch to manual. It literally makes no difference. Force stopping and cleaning the cache of the apps doesn't help as well.
While I could live with it when it comes to FB or LinkedIn, I cant have Gmail or FB Messenger holding my messages for so long without notifying me. I need them for my work and sometimes time is of the utmost essence.
Any help or advice would be greatly appreciated
EDIT: I just noticed that I'm having same problems with Google Keep app when using reminders
Please, guys, help!
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Click to collapse
I've the same updates like yours but mine has no problem
Sent from my BLA-L29 using Tapatalk

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yap.rony said:
I've the same updates like yours but mine has no problem
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Did you make a full system reset afterwards?

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neverone said:
Did you make a full system reset afterwards?
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Click to collapse
Do you have root? Try freezing powergenie app, it should allow the notifications to come on time. The only issue is there might be a "slight" battery drain from more apps allowed to run in background. That was a dirty fix that worked even in emui 8/9 and peps seemed to have no issues even after the mod.
Since emui 9.1 introduces erofs file system, you'll have to either freeze the app in question everytime you reboot or create magisk module that during boot replaces contents of /system/app/HwPowerGenieEngine3 with empy folder - I'm not sure how removing odex files affects the thermals so I suggest just removing apk file and keeping everything else from the original directory intact if the temps and phone performance behave odly after doing this.
Feel free to give it a try, but I don't think it's actually worth doing it. The old forum post suggesting this mod actually overlooked the importance of power genie when it comes to temps + performance regulations across the board. Without it the temps will rise, phone won't supercharge and the performance will dip.
I'm actually playing around with this rn, trying to remove thermal limits on per app basis, if I come across anything I'll let ya know. Good luck

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Have you made test on both mobile network and on WLAN? And what provider do you use with this phone? I see OP1 and VIP in your profile, probably outdated.

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Rstment ^m^ said:
Do you have root?
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Click to collapse
Yeah, thanks, and I can see that you really wanted to help but no, I never rooted this phone, so I guess that all the tips you have for me are, unfortunately, in vain
Thanks though, for trying to help!
domy_os said:
Have you made test on both mobile network and on WLAN? And what provider do you use with this phone? I see OP1 and VIP in your profile, probably outdated.
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Click to collapse
Yep I did, sometimes switching between WiFi and mobile network does activate the apps to check for new messages/mail, and sometimes it doesn't. I haven't noticed any clear pattern.
And it must be difference between XDA forums and the app. I swear I switched it when I bought the Mate. But I'm still on VIP/A1

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@neverone, go to Settings > Battery > More battery settings and switch on the option Stay connected when device sleeps. I didn't see you mention this somewhere, I switch this on after every factory reset.

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domy_os said:
@neverone, go to Settings > Battery > More battery settings and switch on the option Stay connected when device sleeps. I didn't see you mention this somewhere, I switch this on after every factory reset.
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No I haven't, but now that I checked, it was turned on all the time. However, knowing that sometimes this actually works, I toggled it off and back on several times and restarted the phone. I'll pay closer attention during the day to see if that helped and report back here. Thanks for the suggestion.

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I too have this issue in my M10Pro specially in messenger. sometimes the chat icon doesn't appear even if i have an unread message.

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domy_os said:
@neverone, go to Settings > Battery > More battery settings and switch on the option Stay connected when device sleeps. I didn't see you mention this somewhere, I switch this on after every factory reset.
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cheeze.keyk said:
I too have this issue in my M10Pro specially in messenger. sometimes the chat icon doesn't appear even if i have an unread message.
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Click to collapse
Here's an update: Turning off and on the "Stay connected" option did not help at all, the real proof is that i received an email notification of cheeze.keyk replying to this thread, and I only saw it when I logged in on my PC. The phone did not notify me at all.
So the problem still persists, unfortunately. I am really hoping that I won't have to make a factory reset, although it is also uncertain if that would help at all.

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totally bummed. my Mate 10 Pro screen just went crazy. It now has a bright green line all across the very bottom of the screen. And the whole screen now has a faint "screen door" effect going on. just enough to be irritating. I doubt I can live with it, but I loved this phone.

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jimberkas said:
totally bummed. my Mate 10 Pro screen just went crazy. It now has a bright green line all across the very bottom of the screen. And the whole screen now has a faint "screen door" effect going on. just enough to be irritating. I doubt I can live with it, but I loved this phone.
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I'm sorry that you're experiencing such issues, but I don't see the link between your issues, and the issues we're discussing here.

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agreed. wrong thread. sorry

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@neverone, another idea. Have you frozen some system apps, especially Google Play Services? Or maybe disabled in battery app launch or turned on battery optimization for Google Play Services and Google Services Framework?

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domy_os said:
@neverone, another idea. Have you frozen some system apps, especially Google Play Services? Or maybe disabled in battery app launch or turned on battery optimization for Google Play Services and Google Services Framework?
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Click to collapse
These two screenshots show show which apps I have frozen/disabled and which of the Google based apps have and don't have battery optimisation activated.
This essentially hasn't changed since I bought the phone over a year ago. Do you think I should do something with these apps or change some of their settings?

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Send also the complete screenshot of Settings > Battery > App launch > Three dots > Manage manually.
Did you restrict background data maybe? Settings > Wireless & networks > Data usage > Network access > in upper drop down menu switch to Advanced network settings > Tick all apps on both installed and system apps list.
And the last question, do you use Smart Data Saver? Settings > Wireless & networks > Data usage > Smart Data Saver

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domy_os said:
Send also the complete screenshot of Settings > Battery > App launch > Three dots > Manage manually.
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Here you go, attached. Hope you'll be able to read all the apps ?
domy_os said:
Did you restrict background data maybe? Settings > Wireless & networks > Data usage > Network access > in upper drop down menu switch to Advanced network settings > Tick all apps on both installed and system apps list.
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Click to collapse
Nope, all processes have an unrestricted background data ?
domy_os said:
And the last question, do you use Smart Data Saver? Settings > Wireless & networks > Data usage > Smart Data Saver
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Click to collapse
Nope, data saver has been turned off and moreover, most of the apps seem to be ticked as an exception if it ever gets turned on

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Hope that you put all checkmarks on Google Play Services and all other apps you have notifications problem.

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Well as you can see, considering Google's apps, all is good.

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I mean this one in Settings > Battery > App launch > Three dots > Manage manually, have a look on attachment.
So, my Email client, Google Play services, Moj Telekom, Viber and WhatsApp have set all three options: auto-launch, secondary launch and run in background. With this setup, I have no problems at all.