Bright white flash when display turns off about android_kernel_google_wahoo HOT 80 CLOSED

There's a good chance this has something to do with low temperatures. Maybe I should stick my phone in the fridge...

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Some other users asked if I could get DFS to work in Europe. Maybe you can help test that after this is wrapped up.

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No idea what they mean by low temperature. I put my phone in the refrigerator for an hour and, even though it was quite cold, it didn't have any flashes.

Sultan-kernel-wahoo-20msstepup_20200610.zip

Try this kernel.

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I suspect you'll have the same issue with 20/30/5, but let's wait and see anyway I guess.

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Sultan-kernel-wahoo-30ms30ms0ms_20200610.zip

Alright, try this one.

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Use the 20/30/20 kernel from a previous comment: https://github.com/kerneltoast/android_kernel_google_wahoo/files/4766920/Sultan-kernel-wahoo-20ms30ms20ms_20200610.zip

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Cool, I'll roll with that then. Make a new issue for DFS and I'll take a look either this weekend or next week. I'm moving so this week is going to be busy for me...

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Sultan-kernel-wahoo-noclkpostpre_20200602.zip

Try this kernel.

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Thank you, i'm just trying to get some definitive repro instructions so that i can confirm. I couldn't get it to do it last night, but this morning it's now doing it again. I'll get back to you asap!

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Sorry i didn't get around to this, I flashed the android 11 developer preview to see if they had changed the DFS to magically work on pixel devices here in UK, but sadly not (I wasn't holding out much hope for it tbh).

I'll be looking to re-flash the sultan kernel once i get back to android 10 stock, so will put this version and see how it goes.

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i'm back on stock, sultan & magisk now. I ran some tests last night and am monitoring it this morning (which is when I normally notice this issue). I'll update the issue with anything I find.

I'm more than happy to assist with testing DFS 👍

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@kerneltoast using the zip you supplied I'm still able to make it flash.
I've loaded a game (Darkfire Heroes) and tap around in the game for roughly 2 mins and then and allow the screen to turn off with the timeout OR the power button, it's flashing consistently.

If the screen is off for a few minutes the flashing will no longer occur until i go back to using the game again for a little while.

Surface temperature of the device is approx 25C / 77F when this issue occurs.

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Battery has now dropped below 90% and i can't seem to get it to flash any more.

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Downloaded a different game (RaceCraft) and got it to flash again after playing it for a few minutes.

Battery at 83%.
Surface temp approx 28C 82F

Interesting note when i can reproduce the bright white flash:

1. i unlock and then lock the screen again quickly, the white flash becomes more dim
2. repeat (1) and the flash stops altogether

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Sultan-kernel-wahoo-paneldelay_20200602.zip

Try this kernel now.

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Running that one now, i will get back to you asap. Thanks

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@kerneltoast I've been unable to get this version to break after following the usual steps both last night and this morning. Looks good to me 👍

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Looks like it was caused by a88bb7b, but that's a nice commit. Let's see if we can tweak it a bit and keep the fast display power on.

Sultan-kernel-wahoo-intwidthdly_20200610.zip

Try this kernel.

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I'm afraid this one is intermittently flashing both on screen timeout and when a notification arrives.

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do you have any idea what they mean by "low temperature"? if i can ascertain a target temp it might make it simpler to test. I couldn't see any specific information in the commit notes

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managed to get an approx 30% brightness flash just now with this 20ms. It's liveable, but it depends on how far you want to go with this.

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Livable isn't good enough; there needs to be zero glitches.

Sultan-kernel-wahoo-90msstepup_20200610.zip

Try this kernel.

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i'm glad you said that, patching now.

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still getting it on 90ms. actually very similar to the 20ms one.

seems to be most consistent immediately after a reboot:

1. reboot
2. immediately open play store
3. use power button to turn off screen
   • flash happens pretty much mid-point between screen going dark and ambient display turning on

so: power button pressed, screen goes dark, flash then dark again, ambient display on

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Sultan-kernel-wahoo-sleepexit60ms_20200610.zip

Try this kernel.

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ok, i've got this one to flash a few times, but not full brightness and not every time. the above reproduction steps now only work half the time

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Sultan-kernel-wahoo-fulldlynewclkpostpre_20200610.zip

Try this. It's almost the same as Sultan-kernel-wahoo-paneldelay_20200602.zip. If this is fine, I think I'm going to go ahead and revert the panel delay reduction after giving you one more test.

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This looks good. Currently unable to reproduce

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Feel free to send over some sanity checks 👍

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Sultan-kernel-wahoo-60ms20ms20ms_20200610.zip

Try this. I'm going to try and see if your device can tolerate just slightly reducing some panel delays.

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no flashing on power button -> ambient

but a very bright flash on notification. this one is much more awkward to test unless i write an app to send a notification after a specific time delay. It happened by chance just now.

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interestingly having just said that, i now got a very bright flash after pressing the power button.
I'm sorry this is possibly a hinderance rather than a help

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Not a problem. It either works or it doesn't. In this case it looks like it doesn't, so here's another test.

Sultan-kernel-wahoo-60ms60ms20ms_20200610.zip

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haven't been able to get this to flash. either by power button, timeout, or notification.

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Sultan-kernel-wahoo-60ms40ms20ms_20200610.zip

Oh cool there's some leeway. Try this.

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this looks good too, in all cases 👍

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Sultan-kernel-wahoo-60ms30ms20ms_20200610.zip

Cool, try this.

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looks good so far, just waiting for a notification so i can test the wakeup too

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just received some notifications, no flashing. looks good

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Sultan-kernel-wahoo-30ms30ms20ms_20200610.zip

Nice, that's a 60ms savings we get to keep. Try this.

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this looks good also :)

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Sultan-kernel-wahoo-10ms30ms20ms_20200610.zip

Nice, try this.

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unfortunately this version is flashing on a fresh boot with the power button

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Sultan-kernel-wahoo-20ms30ms20ms_20200610.zip

How about this.

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this is working for me 👍

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Sultan-kernel-wahoo-20ms30ms5ms_20200610.zip

Awesome, try this.

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This is also good for me

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Use that kernel for at least 2 days to see if any problems arise. If a flash occurs, you can immediately leave a comment here saying that it failed.

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Actually, let me give you one more kernel @TomK

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Sultan-kernel-wahoo-20ms30ms0ms_20200610.zip

Use this kernel for 2-3 days, unless it shows problems immediately.

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running with the latest 20/30/0 as it seems to be working atm

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just had a few flashes on this version. will rollback to 20/30/5 and run that for a while

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Did they occur when you got a notification, or when you turned the screen off with the power button? I don't think the 20/30/5 kernel will be any different; it seems like that final delay isn't necessary.

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I can't be certain which triggered it. It's most likely that it was power button.
I pressed the power button, put the phone down and then saw a flash. Although i did get a notification around the same time.

Since I rolled back to 20/30/5 i haven't experienced the issue again (yet)

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Just had a flash on power button press

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Just had another flash when turning the screen on this time. Took it out of my pocket, pressed the button and it flashed before the screen came on

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Sultan-kernel-wahoo-20ms40ms0ms_20200610.zip

How about this

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running this now, will keep you updated

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Just had a flash on screen timeout

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Sultan-kernel-wahoo-40ms30ms0ms_20200610.zip

Hmm, maybe it's that first delay. Try this.

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Just had a power button flash on this version

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Just wanted to check. The version still shows date as 10th june in settings. Is that correct, or is twrp failing to flash properly?

4.4.210-Sultan
#1 Wed Jun 10 18:22:18 PDT 2020

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Yeah, that's correct. Only the dtbo is being changed.

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ok, looks like this one is failing also i'm afraid, had it flash on power button earlier this morning. Will continue to monitor it for now.

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Sorry I fell asleep and didn't give you another test. I'll send another in a bit.

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Just had quite a few flashes on this one. Notification and also power button.

Plugged in, at 100% charge

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Sultan-kernel-wahoo-20ms90ms0ms_20200610.zip

Hmm, let's try isolating which delay is at fault. Try this.

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I've been running this since you posted it, no issues so far.

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Sultan-kernel-wahoo-20ms50ms0ms_20200610.zip

Cool, we're getting close.

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Running this now 👍

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just failed on power button press

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Sultan-kernel-wahoo-20ms60ms0ms_20200610.zip

Only a few more to go.

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same again on this one. flash on power button press

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Sultan-kernel-wahoo-20ms70ms0ms_20200610.zip

Wow, we might not be able to reduce that middle delay at all. Here's another.

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Got another flash I'm afraid

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Wow, okay! Keep using the 20/90/0 kernel for a bit longer (https://github.com/kerneltoast/android_kernel_google_wahoo/files/4787637/Sultan-kernel-wahoo-20ms90ms0ms_20200610.zip) and if all is well, that's what I'll push. I don't think we can shave off anything from the 90ms delay.

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Righto, reverting to that now 👍

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So far so good, been running it for 4 days with regular usage.

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No madness, I really appreciate the time you put into this!

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