Try my extra : (no need to disable anything in bios)
Change of this extra.lzma >
- removed drivers i915.ko drm_kms_helper.ko drm.ko in usr/lib/modules
- removed reference of this drivers in etc/rc.modules
Installation >
sudo -i
echo 1 > /proc/sys/kernel/syno_install_flag
mkdir -p /mnt/synoboot1
mkdir -p /mnt/synoboot2
mount /dev/synoboot1 /mnt/synoboot1
mount /dev/synoboot2 /mnt/synoboot2
Remove extra2.lzma and replace extra.lzma by the one attach at this is post in /mnt/synoboot2
Important > clean /usr/lib/modules/update/* - Be careful with the rm !
rm -rf /usr/lib/modules/update/*
And reboot.
you might not have KP on i915 but you''ll probably lost your LAN, since this motherboard only have an old PCI port, i have no clue about a LAN card in PCI that might work.
Alternatively you can use a dongle USB3 > LAN, a one with a ax88179 chips like this one > https://www.amazon.fr/gp/product/B00MYTSN18/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
This chipset work natively with the DSM driver :
[ 240.104583] ax88179_178a 2-3:1.0 eth1: register 'ax88179_178a' at usb-0000:00:15.0-3, ASIX AX88179 USB 3.0 Gigabit Ethernet, 00:0e:c6:bd:d5:13
[ 240.118675] usbcore: registered new interface driver ax88179_178a
extra.lzma