[Bug 108225] New: Acer V3-772G screen brightness cannot be adjusted with i915.fastboot enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108225

            Bug ID: 108225
           Summary: Acer V3-772G screen brightness cannot be adjusted with
                    i915.fastboot enabled
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ericbasil.rabi at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 141889
  --> https://bugs.freedesktop.org/attachment.cgi?id=141889&action=edit
dmesg with no fastboot and with fastboot using drm.debug=0x1e

When booting with the option i915.fastboot=1 in command line, the screen
brightness of Acer V3-772G laptop cannot be adjusted. When fastboot option is
removed, the screen brightness can be adjusted without issues.

Distro: Fedora 29

`uname -r`
4.18.11-301.fc29.x86_64

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0002, DMI type 2, 16 bytes
Base Board Information
        Manufacturer: Acer
        Product Name: VA70_HW
        Version: Type2 - Board Version
        Serial Number: NBM8S11001411026447200
        Asset Tag: Type2 - Board Asset Tag
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis: Type2 - Board Chassis Location
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0

`ls /sys/class/backlight` output for both fastboot enabled and disabled:
intel_backlight

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