Garbled display with kernels 5.15 and 5.14
11-03-2021, 02:38 PM
I am running Debian bullseye with a self-compiled kernel. The last working version I have available is kernel 5.12.12.
I now decided to try a more recent kernel and compiled kernel 5.15. Booting this kernel results in a garbled display.
To check whether the display still worked fine with older versions, I tried kernel 5.14.14 (which I am using for another RK3399 device). The same result, garbled display.
Please see the attached image for what the garbled display looks like.
It's not damaged hardware: the display works perfectly with kernel 5.12.12. It's not something in the DT: kernel 5.15 still results in a garbled display with the DT from kernel 5.12.12 and kernel 5.12.12 with the DT from kernel 5.15 gives a working display.
I did not spot any difference in the kernel configurations that seemed likely to cause the issue. I am not applying any patches to the kernel.
I would appreciate any hint regarding the cause.
I now decided to try a more recent kernel and compiled kernel 5.15. Booting this kernel results in a garbled display.
To check whether the display still worked fine with older versions, I tried kernel 5.14.14 (which I am using for another RK3399 device). The same result, garbled display.
Please see the attached image for what the garbled display looks like.
It's not damaged hardware: the display works perfectly with kernel 5.12.12. It's not something in the DT: kernel 5.15 still results in a garbled display with the DT from kernel 5.12.12 and kernel 5.12.12 with the DT from kernel 5.15 gives a working display.
I did not spot any difference in the kernel configurations that seemed likely to cause the issue. I am not applying any patches to the kernel.
I would appreciate any hint regarding the cause.
