Hi, The fix has been posted here.
https://lkml.org/lkml/2018/9/8/14 Best regards, Lu Baolu On 09/08/2018 09:57 PM, Dmitrii Tcvetkov wrote:
I've sent the email[1] before to iommu and lkml mailing lists only, but according to iommu mailing list archive it wasn't received[2]. I'm resending it to Lu Baolu and Joerg Roedel with proper kernel .config file. Sorry if the duplication is unnecessary. Since 4.19-rc1 my laptop boots with vertical static set of rows of dots on the screen instead of proper video output. SSH'ing into it allowed to get dmesg-without-pt.log output, PCI device 00:02.0 is VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02) Appending "iommu=pt" to kernel cmdline allowed to boot with functional graphics, but gave dmesg-with-pt.log output. Bisect between v4.18 and v4.19-rc1 tags led me to commit a7fc93fed94b173e2 (iommu/vt-d: Allocate and free pasid table). Reverting this commit allows to build kernel on current master (a12ed06ba2d3fa60e), which boots with functional graphical output without specifying "iommu=pt". Dmesg output is in dmesg-with-revert.log. Without the revert current master boots like 4.19-rc1. [1] https://lkml.org/lkml/2018/9/7/1081 [2] https://lists.linuxfoundation.org/pipermail/iommu/2018-September/date.html
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