Coping my response from another thread ([RESOLVED] 13" Ryzen 5 + Debian 12 fails to wake from sleep - #14 by Matt_Hartley) if somebody is looking for an answer :
Hello, I had the same problem with Debian 12,
successfully resolved by extracting last tarball from here (kernel/git/firmware/linux-firmware.git - Repository of firmware blobs for use with the Linux kernel) into /usr/lib/firmware/
And I comment to tell that updating initramfs is mandatory (didn’t work before with this error in dmesg: firmware: failed to load amdgpu/gc_11_0_1_mes_2.bin (-2) )
So do : update-initramfs -u
Thank you