[Bug 112159] New: GPU hang with i915.enable_psr=1 (Kaby Lake R)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112159

            Bug ID: 112159
           Summary: GPU hang with i915.enable_psr=1 (Kaby Lake R)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: raphael.kubo.da.costa at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145835
  --> https://bugs.freedesktop.org/attachment.cgi?id=145835&action=edit
dmesg with drm.debug=0x1e log_buf_len=1M

I'm running Fedora with kernel 5.3.7, and have been experiencing this issue for
several months. Essentially, if I boot my laptop _without_ plugging it to an
external display (via an HDMI port, for example), then it is almost 100%
certain that it is either going to hang while waiting for my LUKS password,
during the boot process or if I later switch to a non-X11/Wayland VT. The
entire machine hangs, and I need to manually power it off and then turn it on
again. This machine is a Dell Latitude 7390 with an i7-8650U processor.

I played with a few boot parameters today, and noticed that any of the
following seem to stop the problem from happening:
* intel_idle.max_cstate=1
* i915.enable_dc=0
* i915.enable_psr=0
* i915.dmc_firmware_path=""
* nomodeset i915.modeset=0

I'm attaching dmesg from a kernel-debug run with drm.debug=0x1e and
log_buf_len=1M that did not hang, but has two WARN_ONs there. I also have a few
other saved dmesgs, but they were produced without booting with drm.debug=0x1e
and log_buf_len=1M.

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