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9020sff/mt: say how to get graphics cards working 

Signed-off-by: Leah Rowe <info@minifree.org>
master
Leah Rowe 2024-02-23 05:21:14 +00:00
parent 05036a5171
commit c619e583b9
1 changed files with 18 additions and 0 deletions
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site/docs/hardware/dell9020.md
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@ -91,6 +91,24 @@ Kukri's patch is here:
This patch, at this revision (patchset 31), is what Libreboot uses for this
port.
Graphics cards
--------------
On current lbmk master, graphics cards *do* work. The option to hide PEG
devices from MRC was disabled. Now when you insert a graphics card, the
onboard Intel GPU is disabled and the graphics card is used instead.
NOTE: You must set `iommu=off` in your linux cmdline. For instance, set this
in `/etc/default/grub` and regenerate your GRUB config. With the IOMMU turned
off, graphics cards work fine. Otherwise, with IOMMU turned on, you might get
this error:
<https://av.vimuser.org/error.jpg>
NOTE2: You *can* use the onboard Intel GPU (without a graphics card inserted),
and leave IOMMU turned on. You only need to disable the IOMMU when a graphics
card is inserted. This bug will be investigated and fixed at a later date.
7020 compatibility
------------------