[Bug 109618] Intel TearFree feature stops working at random

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109618

--- Comment #3 from Sultan Alsawaf <sultan at kerneltoast.com> ---
Created attachment 143372
  --> https://bugs.freedesktop.org/attachment.cgi?id=143372&action=edit
Dmesg with TearFree broken

Here's what appeared in dmesg at the time TearFree stopped working:
[   40.623699] [drm:drm_mode_addfb2 [drm]] [FB:99]
[   47.605365] [drm:drm_mode_addfb2 [drm]] [FB:102]
[   59.111051] [drm:drm_mode_addfb2 [drm]] [FB:102]
[   62.602841] [drm:intel_power_well_disable [i915]] disabling DC off
[   62.602893] [drm:gen9_dc_off_power_well_disable [i915]] Enabling DC6
[   62.602942] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
[   63.545157] [drm:intel_power_well_enable [i915]] enabling DC off
[   63.545224] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
[   66.937268] [drm:drm_mode_addfb2 [drm]] [FB:98]
[   78.235814] [drm:drm_mode_addfb2 [drm]] [FB:99]
[   80.167855] [drm:drm_mode_addfb2 [drm]] [FB:103]
[   80.186272] [drm:drm_mode_addfb2 [drm]] [FB:105]
[   80.205084] [drm:drm_mode_addfb2 [drm]] [FB:106]
[   83.387359] [drm:drm_mode_addfb2 [drm]] [FB:103]
[   83.405156] [drm:drm_mode_addfb2 [drm]] [FB:105]
[   83.421814] [drm:drm_mode_addfb2 [drm]] [FB:106]

I've attached the full dmesg. Also, it turns out it is extremely easy to
reproduce this by just toggling full-screen mode on/off on a YouTube video in
Chromium.

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