thanks, i've already recognized, that was the issue. but suspend doesn't work, tried also acpi_osi="linux" and various other acpi related bootflags.
i've figured out that suspend doesn't work from live cd or live usb either, further i can't do partitioning before cli or live cd install without triggered ahci in the bios, otherwise the installer crashes.
but when i boot after install with ahci i got something like this:
[ 15.720046] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 16.540846] ata1.00: ACPI _SDD failed (AE 0x5)
[ 16.553907] ata1.00: ACPI: failed the second time, disabled
which disappears in ide mode, but without any advantage.
thanks for the help with this!