[Bug 110798] 915][HSW] Haswell-Core-I5-4210U notebook display doesn't flicker only with i915.modeset=0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110798

            Bug ID: 110798
           Summary: 915][HSW] Haswell-Core-I5-4210U notebook display
                    doesn't flicker only with i915.modeset=0
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: altsyde at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 144383
  --> https://bugs.freedesktop.org/attachment.cgi?id=144383&action=edit
Demonstration of flickering on right corner of the screen

I have notebook HP Elitebook Folio 1040 G1 which comes with processor Intel
i5-4210U.
I have few types of periodic flickering which happens only on Linux (I don't
see it on Windows or BIOS).
1) If I leave mouse cursor for few seconds, then start to moving it, there's
slight flicker (like display brightness changes a little)
2) On the top left corner sometimes appears artifacts (see attached video).
They mostly reproduceable if you have black panel or window decoration on top.

I tried different distros and DEs:
* Ubuntu MATE 16.04 (kernel 4.4), xUbuntu 18.04 (kernel 4.15 and 5.0), Fedora
30 with GNOME Wayland, KDE Neon with Plasma 5.15 on XOrg.
Each of them suffer from this issue.
I tried different GRUB options: i915.enable_rc6=0 ; i915.enable_psr=0 ;
i915.i915_enable_fbc=1.

Also tried all available Refresh Rates (from 40HZ to 120 HZ) and resolutions.

Problem completely stopped at the last measure - i915.modeset=0

For now I can't test external monitor as this notebook only have DisplayPort

---

It's possible that problem is fixable by replacing display matrix but the fact
that on Windows I can't see any artifacts or flickering worries me.

Please tell which additional logs or system info I can provide

Regards,
Evgen

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