Taranis X9D Plus, T20 and potentially other transmitters - startup screen (pre-splash screen!) scrambled / showing 'white noise' or 'afterglow'

[RipperDrone]

Is there an existing issue for this problem?

• I have searched the existing issues

What part of EdgeTX is the focus of this bug?

Transmitter firmware

Current Behavior

Confirmed with 2 other users on Discord: Taranis X9D Plus (2013) screen is showing 'white noise' screen when powering up, regardless whether splash screen is switched on or off (splash screen will show normally if switched ON, right after the 1-2 secs 'white noise screen'. With some users, it's showing the last screen that was displayed before the transmitter had been switched off last time, instead of the 'white noise' > Looks like screen memory buffer holds random data or last-shown data by the time screen is switched on.

Expected Behavior

up to v 2.9.3, startup behaviour was normal, no white noise screen shown on power up.

Steps To Reproduce

1. Flash ETX2.10 to transmitter
2. Switch transmitter on

Version

Other (Please specify below)

Transmitter

Other (Please specify below)

Operating System (OS)

Windows

OS Version

11 x64

Anything else?

[RipperDrone]

Since it seems to be confined to Taranis transmitters and everything was running fine up to v 2.9.3, I tried to spot recent changes and found this refactoring commit by @raphaelcoeffic to be related to display management - maybe it's related somehow.. 5153aae
Then again, there's some more commits dealing with LCD display buffer (font buffer etc.) and how to manage SD memory to deal with it. Could it be we need to wipe the SD cards to NOT leave scrambled data on certain clusters that serve as LCD memory buffer?

[pfeerick]

It's not just white noise, it can also be last frame that was displayed if you turn back on again after just turning the transmitter off (shutdown image). It affects more than taranis also, I have seen that on T20 (i.e. reverse OLED). As if the display buffer not cleared before/after enabling display.

…

On Mon, 13 May 2024, 1:13 am Reinhard, ***@***.***> wrote: Since it seems to be confined to Taranis transmitters and everything was running fine up to v 2.9.3, I tried to spot recent changes and found this refactoring commit by @raphaelcoeffic <https://github.com/raphaelcoeffic> to be related to display management - maybe it's related somehow.. 5153aae <5153aae> — Reply to this email directly, view it on GitHub <#4995 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABJ66KOML6U25RW5OKIE4PLZB6BIJAVCNFSM6AAAAABHS3LLJOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMBWGI4DMMZTG4> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>