Messages in this thread | | | Subject | Re: No video output on 4.19-rc1 on Dell XPS 13 9360 | From | Lu Baolu <> | Date | Sun, 9 Sep 2018 10:01:17 +0800 |
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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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