[Bug 105549] New: Black/blank screen unless i915.modeset=0 is set

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105549

            Bug ID: 105549
           Summary: Black/blank screen unless i915.modeset=0 is set
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sewkokot at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 138152
  --> https://bugs.freedesktop.org/attachment.cgi?id=138152&action=edit
lspci -v, dmesg, lsmod, mkinitcpio -M

Dell Latitude 5490
8th gen i7-8650U intel iGPU HD 620 (i915)
dGPU geforce MX130 (former 940MX) Maxwell architecture
The problem is on both Debian Sid and Arch Linux (kernels 4.15)

To summarize the problem:

1. Without modesetting disabled the system does not reach a console login. The
result is that for a quater of second I see the screen with some messages. Then
the screen becomes black, I mean the there is a black light on the screen but I
can do nothing (Ctrl-Alt-F2 does not work). I cannot login even blindly to
power off. Neither I have any records in the journal (dmesg) - simply as if the
booting process is non-existing in logs. The final line before the screen goes
black is "fb: switching to inteldrmfb from EFI VGA"

2. While with modesetting the journal log is shown below. I can login. From the
journal I can see that EFI VGA frame buffer is used: "[    5.722465] fb0: EFI
VGA frame buffer device" instead of inteldrmfb.

Below I include additional information from the system when i915.modeset=0 is
passed to kernel parameters.



I could provide more information if needed.

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