Since 4.19-rc1 my laptop boots with vertical rows of dots on the
screen instead of proper video output. SSH'ing into it allowed me 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 output, 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 revert current master boots like 4.19-rc1.
On Fri, 7 Sep 2018 22:16:21 +0300
Dmitrii Tcvetkov <[email protected]> wrote:
> Since 4.19-rc1 my laptop boots with vertical rows of dots on the
> screen instead of proper video output.
By mistake attached wrong kernel config, the issue is reproducible the
laptop on mainline kernel with this config without 3-d party patches.