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

[bugzilla-daemon at freedesktop.org]

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

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|                            |display/PSR
                 CC|                            |jose.souza at intel.com

--- Comment #2 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Raphael Kubo da Costa from comment #0)
> Created attachment 145835 [details]
> 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.

CC'ing Jose.

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