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path: root/config/coreboot/haswell/patches/0027-nb-haswell-lock-policy-regs-when-disabling-IOMMU.patch
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2024-05-04nb/haswell: lock policy regs when disabling IOMMULeah Rowe
Angel Pons told me I should do it. See comments here: https://review.coreboot.org/c/coreboot/+/81016 I see no harm in complying with the request. I'll merge this into the main patch at a later date and try to get this upstreamed. Just a reminder: on Optiplex 9020 variants, Xorg locks up under Linux when tested with a graphics card; disabling IOMMU works around the issue. Intel graphics work just fine with IOMMU turned on. Libreboot disables IOMMU by default, on the 9020, so that users can install graphics cards easily. I'm pretty sure this is the correct way to do it. The machine still seems to boot, in this configuration. Signed-off-by: Leah Rowe <leah@libreboot.org>