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Interfacing (DSI, CSI, I2C, etc.) • mipi-dbi-spi based displays no longer working on 6.12.21

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Set-up a new 3.5in display today and always ended up with a cursor in the upper right corner only when trying to boot to GUI, desktop will not be shown. DUT is a Pi5 running 6.12.21 kernel

Code:

pi@newpi5:~ $ uname -aLinux newpi5 6.12.21-v8-16k+ #1870 SMP PREEMPT Wed Apr  2 20:19:34 BST 2025 aarch64 GNU/Linux
Checked the display when booting to CLI -> all fine (see pictures)
IMG_20250409_170331.jpg
IMG_20250409_170317.jpg
Tested another (known working) display -> same problem: showing cursor only as well.

Any idea what is causing this? Seen such effect when MESA wasn't having mipi-dbi-spi enabled (if memory serves me right). Configured the DUT for labwc -> no changes made

when removing below parameters from the overlay the cursor will no longer be shown and screen is all black

Code:

dtparam=write-only,cpha,cpol

Statistics: Posted by aBUGSworstnightmare — Wed Apr 09, 2025 3:22 pm



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