trixie rc2 installer doesn't work on lenovo t430 or y500 in uefi mode

[Will Senn]

Hi,

long, long-time user of debian (since the stone age pre 1.0 days). I 
wanted to try trixie out on my laptops, but no version of the install 
media will boot on my Lenovo's (neither the t430 nor the y500). These 
are pretty old laptops, yes, but they run 12 fine and mint and mx and 
freebsd, etc.

I have disabled secure boot, tried with UEFI only, UEFI plus CSM, Legacy 
only and legacy only at least gets to the grub menu. With any UEFI 
setting (which I would strongly prefer), it beeps twice and the display 
is blank - not entirely black, more of a charcoal gray, but no grub menu 
get's displayed.

With 12's netinstall, regular install, cinnamon live installer, etc. no 
problems on either the t430 or y500, but with 13... no go on either.

Help. I'm trying to get standardized on debian from mint across my 
various systems and this seems like it's a huge roadblock to my adoption 
plan :). Right now, I'm doing t430 install, so timely help appreciated.

Thanks,

Will