On Mon, Sep 10, 2018 at 11:16:12AM +0300, Meelis Roos wrote:
In 4.19-rc1, I found that to keep Intel integrated graphics working when
VT-d is on, I need to have IOMMU passthough on or GPU init would fail
with DMAR error and the screen would display static gibberish. So I
turned IOMMU PT on by default in kernel config. It worked, also in rc2.
Now with rc3, it still works but I get some warning splats in dmesg
about IOMMU passthrough:
Any chance you could bisect this down to a specific commit? For
a start it might be worth if it is reproducable with:
which were the only dma-mapping changes post -rc2.