Hi Joerg, > On Dec 3, 2019, at 01:00, Christoph Hellwig <[email protected]> wrote: > > On Fri, Nov 29, 2019 at 10:21:54PM +0800, Kai-Heng Feng wrote: >> Serious screen flickering when Stoney Ridge outputs to a 4K monitor. >> >> According to Alex Deucher, IOMMU isn't enabled on Windows, so let's do >> the same here to avoid screen flickering on 4K monitor. > > Disabling the IOMMU entirely seem pretty severe. Isn't it enough to > identity map the GPU device?
Ok, there's set_device_exclusion_range() to exclude the device from IOMMU. However I don't know how to generate range_start and range_length, which are read from ACPI. Can you please give me some advice here? Kai-Henge _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
