linux-kernel - No video output on 4.19-rc1 on Dell XPS 13 9360

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Message-ID: <20180908165747.16c2843c@fire.localdomain>
Date:   Sat, 8 Sep 2018 16:57:47 +0300
From:   Dmitrii Tcvetkov <demfloro@...floro.ru>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: No video output on 4.19-rc1 on Dell XPS 13 9360

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

View attachment "dmesg-without-pt.log" of type "text/plain" (71514 bytes)

View attachment "dmesg-with-pt.log" of type "text/plain" (66020 bytes)

View attachment "dmesg-with-revert.log" of type "text/plain" (59374 bytes)

View attachment "lspci.txt" of type "text/plain" (37251 bytes)

View attachment "bisect.log" of type "text/plain" (2701 bytes)

View attachment "xps-kernel.config" of type "text/plain" (112199 bytes)