Attention is currently required from: Angel Pons, Bill XIE, Jérémy Compostella, Nicholas Chin.
Keith Hui has posted comments on this change by Keith Hui. ( https://review.coreboot.org/c/coreboot/+/85413?usp=email )
Change subject: mb/asus/p8z77-v: Add support to reconfigure PCIe lanes ......................................................................
Patch Set 19:
(1 comment)
File src/mainboard/asus/p8x7x-series/mainboard.c:
https://review.coreboot.org/c/coreboot/+/85413/comment/da842ec6_57e42611?usp... : PS14, Line 67: if (me_sig != -1 &&
Patchset 19 with an intact ME can program IFD well on my p8z77-v now, even with x4. The only regression is that the PCI product ID of the IGD is changed to 0xffff, making the IGD effectively disabled, possibly by ME.
With a neutralized and disabled ME, Patchset 19 seems works fine, with IGD available.
Is your IGD disabled with all pciex16_3_bandwidth settings? Does it still happen for subsequent reboots after straps have been updated and not changed further? Do you have a discrete graphics card, just in case?
For me, IGD is functional and things went dark between GRUB and Linux kernel. I should try a discrete graphics card and neutralized ME.