[Bug 111293] New: [chv][regression][bisected] Brightness adjustment is broken since Linux 5.3rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111293

            Bug ID: 111293
           Summary: [chv][regression][bisected] Brightness adjustment is
                    broken since Linux 5.3rc1
           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: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144941
  --> https://bugs.freedesktop.org/attachment.cgi?id=144941&action=edit
drm-tip dmesg with drm.debug=0x1e from Lenovo Miix 320-10ICR

Hello!

I find that brightness adjustment is broken on Lenovo Miix 320-10ICR since
Linux 5.3rc1, git bisect lead to this commit:

https://github.com/torvalds/linux/commit/4a6ef8e37c4d9a40f09438068da1734fd965bd75

drm-tip 2019-07-30 4040b4c4ab647422d82100c8b091d34b6a82f572 log with
drm.debug=0x1e log_buf_len=8M where I trying to adjust brightness is attached.

Brightness adjustment works fine on Linux 5.0-5.2 (earlies releases wasn't
tested).

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