intel bios update capsule header invalid

It doesn’t change the content once I boot the host as with my kernel configs and cmdline there is no new output on the display. So, before I found the option in the BIOS to disable loading Video OpRom (it was hidden behind activating CSM but then still setting everything to UEFI), the eDP display would show the vendor’s boot logo and the display would be bright. The eDP panel should still work once the guest boots and loads its driver, but the backlight won't So there’s no use in trying to find and dump it from the BIOS image, I suppose? Which won't be useful for the guest since it's intermingled with CPU power-on sequences. I also tried to power cycle the card as much as possible by removing the PCI device from the /sys/ tree, but alas it doesn’t help and only causes DMAR issues. I tried to dump it using the methods described in these articles:Ī post in this reddit I can't find atm (will update later), which said to boot a VM with the iGPU attached, turn the VM off and then dump the bios (would have to unplug eDP, which I didn't try) I tried getting the video BIOS from Windows, but it's not possible to dump. It is not possible to boot with the dGPU, all outputs except for the internal eDP connector are directly connected to the dGPU (apparently, there is a muxed setup where the dGPU sends it's pictures to the iGPU which shows them on the laptop's screen) proc/cmdline: intel_iommu=on iommu=pt earlyprintk=serial,ttyS0,115200,8n1 console=ttyS0,115200,8n1 video=efifb:off,vga:off console=tty1 console=ttyUSB0 modprobe.blacklist=i915,nouveau (disables any output on screen reliably, but note, without recompiling the kernel and removing vga arbiter it still touches the graphics card)īut it never gave possibility for the guest to use the device. Setting the Video OpRom loader to None in the BIOSĬompile kernel with no framebuffer, vga console, vga arbiter and basically no graphics at allīoot the kernel directly as EFI application without GRUB2 or any bootloader in between which could mask the VBIOS on the iGPU I already tried to completely isolate the iGPU from the whole boot process and it reliably prevents the screen from showing anything at all, including The guest always complains, that it can't find the VBIOS. Or vfio pci 0000:00:02.0: 'Video device with shadowed ROM' at I only get a black screen and error messages in dmesg such as: vfio-pci 0000:00:02.0: vfio_ecap_init: hiding ecap 703.013256] vfio-pci 0000:00:02.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff I tried different setups but it doesn't work.

I'm trying to get OVMF PCIe passthrough of my iGPU on my laptop running, also called GVT-d for Intel GPUs, such that the VM controls the display of my laptop.

Intel bios update capsule header invalid