[Bug 111966] New: [i915]GDM Login screen doesn't show up on kernel 5.3 or later

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111966

            Bug ID: 111966
           Summary: [i915]GDM Login screen doesn't show up on kernel 5.3
                    or later
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: masami256 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

1. problem

Boot with kernel 5.3 or later, GDM login screen doesn't show up.
Following log is displayed in console.

Starting Show Plymouth Boot Screen...

When I remove rhgb and quiet from kernel command line, it shows gray background
screen and blinking.

Kernel 5.2.18 doesn't have such issue.
I checked 5.2.18(fedora kernel) and 5.2.18(stable release) both works fine.

I've tested drm-tip tree(HEAD is ec6a1544198d81f34a367bfb18173e402bbee0fa). The
drm-tip tree kernel has same issue.


2. Steps to reproduce the issue. 

Boot with kernel 5.3 or later

3. How often does the steps listed above trigger the issue?

always

4. The following information about your system:

system architecture: x86_64
kernel versions: 5.4-rc2(mainline), 5.4-rc2(drm-tip), 5.3.2(fedora kernel),
5.3.2(stable release)
Linux distribution: Fedora 30
Display connector: HDMI and DIV
/sys/class/drm/card0/error: I'll attach
dmesg: I'll attach
xrandr output: I'll attatch (taks this output on kernel 5.2.18)
VBIOS dump: I'll attach

5. bisect

If I did bisect correctly, "drm/i915/bios: make child device order the priority
order(36a0f92020dc8794d3aa69b7fb4c5d2bf99b0099)" is first bad commit. previous
commit "drm/i915: Enable
intel_color_get_config()(3633e5116dfb01f98de4c88daf2c673c52290755)" works
fines.

I took dmesg, /sys/class/drm/card0/error, VBIOS dump on drm-tip kernel.

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