[Bug 111500] New: Latitude 7400 2-in-1: intermittent screen freezes (i915)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111500

            Bug ID: 111500
           Summary: Latitude 7400 2-in-1: intermittent screen freezes
                    (i915)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: leho at kraav.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

(Originally at https://bugzilla.kernel.org/show_bug.cgi?id=204701)

Hardware: Dell Latitude 7400 2-in-1 with Wacom 0x48C9 touchscreen

Seemingly at random, this Coffeelake gen9 chip graphics engine is
intermittently freezing on me. Mouse cursor has been in a Firefox web browser
window at least on a few occurrences.

External screen, connected via Type C, also froze.

Kernel stays alive, because I could still reboot via magic sysrq and REISUB.

After rebooting, checking `journalctl -b -1` reveals zero error messages from
Xorg, or kernel.

It feels like i915 might be involved with maybe one of the performance
parameters (dc, psr, fbc, rc6, etc) being incompatible with this relatively new
hardware.

There's also another known bug with this (touch)screen at designware i2c level
https://bugzilla.kernel.org/show_bug.cgi?id=204063

Of course, this might just be faulty hardware, but setting up testing a Win10
installation here is a large challenge. I'd like to exclude Linux software
stack issues first.

====

Q: what kernel or i915 paramaters would you recommend I test first, to see if
freezes can go away?

====

PS I've run this same OS installation on DELL 7480 (KBL) for 2 years without
any video issues, so it's either some new gen hardware incompatibility or
broken hardware.

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