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Diffstat (limited to 'config/coreboot/default/patches/0035-dell-optiplex_9020-Disable-IOMMU-by-default.patch')
-rw-r--r--config/coreboot/default/patches/0035-dell-optiplex_9020-Disable-IOMMU-by-default.patch29
1 files changed, 29 insertions, 0 deletions
diff --git a/config/coreboot/default/patches/0035-dell-optiplex_9020-Disable-IOMMU-by-default.patch b/config/coreboot/default/patches/0035-dell-optiplex_9020-Disable-IOMMU-by-default.patch
new file mode 100644
index 00000000..1b9497c2
--- /dev/null
+++ b/config/coreboot/default/patches/0035-dell-optiplex_9020-Disable-IOMMU-by-default.patch
@@ -0,0 +1,29 @@
+From b7a80abe673c279e755efbe92851ec0600467fae Mon Sep 17 00:00:00 2001
+From: Leah Rowe <info@minifree.org>
+Date: Sat, 2 Mar 2024 23:00:09 +0000
+Subject: [PATCH 35/39] dell/optiplex_9020: Disable IOMMU by default
+
+Needed to make graphics cards work. Turning it on is
+recommended if only using iGPU, otherwise leave it off
+by default. The IOMMU is extremely buggy when a graphics
+card is used. Leaving it off by default will ensure that
+the default ROM images in Libreboot will work on any setup.
+
+Signed-off-by: Leah Rowe <info@minifree.org>
+---
+ src/mainboard/dell/optiplex_9020/cmos.default | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/mainboard/dell/optiplex_9020/cmos.default b/src/mainboard/dell/optiplex_9020/cmos.default
+index 8000eea8c0..0700f971ee 100644
+--- a/src/mainboard/dell/optiplex_9020/cmos.default
++++ b/src/mainboard/dell/optiplex_9020/cmos.default
+@@ -4,4 +4,4 @@ debug_level=Debug
+ nmi=Disable
+ power_on_after_fail=Disable
+ fan_full_speed=Disable
+-iommu=Enable
++iommu=Disable
+--
+2.39.2
+