[Bug 112195] New: machine hangs after modprobe i915 modeset=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112195

            Bug ID: 112195
           Summary: machine hangs after modprobe i915 modeset=1
           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: pked01 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145870
  --> https://bugs.freedesktop.org/attachment.cgi?id=145870&action=edit
dmesg+logs from netconsole

Hello

Steps to reproduce the issue: the screen becomes black and machine hangs after
sequence:
rmmod i915
modprobe i915 modeset=1
How often: every time
system architecture: x86_64
kernel version: 5.4.0-rc4 from drm-tip: commit
90d6ad2cbeadd27e867df4e649d61f14b4ac4b77
Linux distribution: Debian 10
Machine or mother board model: Dell Inspiron 3552
Display connector: build in screen
lspci -v -n:
00:02.0 0300: 8086:22b1 (rev 35) (prog-if 00 [VGA controller])
        Subsystem: 1028:06ac
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [d0] Power Management version 2
        Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
        Capabilities: [b0] Vendor Specific Information: Len=07 <?>
        Kernel modules: i915

I have to boot with i915.modeset=0. In other case machine hangs during startup
process.
I can reproduce this situation with rmmod i915, and then modprobe i915
modeset=1.
Could you please help me? Thank you.

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