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Without this, neither Qubes OS nor the Qubes OS installer would start. Presumably, because we're "kexecing" from an already running kernel, we need this set at the Coreboot level? Testing revealed that including `intel_iommu=igfx_off` in the `CONFIG_BOOT_KERNEL_ADD` board config option did nothing. And, the Qubes OS default boot option already contains `intel_iommu=igfx_off`. See: - https://www.qubes-os.org/doc/installation-troubleshooting/#not-asking-for-vnc-because-we-dont-have-a-network--x-startup-failed-aborting-installation--pane-is-dead-error-during-installation - https://github.com/Qubes-Community/Contents/blob/master/docs/troubleshooting/intel-igfx-troubleshooting.md - https://www.kernel.org/doc/html/v5.10/x86/intel-iommu.html?highlight=igfx_off#graphics-problems