Bug#969944: debian-installer: Screen is corrupted (Secure Boot)

[ng <konoha02@yahoo.com>]

I found out that having Secure Boot enabled is necessary to reproduce 
this.  With Secure Boot disabled the installer works correctly with the 
defaults.

> Hi,  I am currently using: debian-bookworm-DI-rc1-amd64-netinst and I 
> am currently having this bug.
>
> If I change the boot parameter 'VGA=788' to 'VGA='  it works correctly.
>
>
> AMD Ryzen 5 3500U
> Thinkpad E495
> debian-bookworm-DI-rc1