[Intel-gfx] -stable regression in Intel graphics, introduced in Linux 5.10.9

[Diego Calleja]

Hi,

There is a regression in Linux 5.10.9 that does not happen in 5.10.8. It is still there as
of 5.11.1

This regression consists in graphics artifacts that will *only* start appearing after resuming
from suspend. They don't happen immediately after resuming from suspend either, but
after some minutes.

My system has integrated intel graphics
00:02.0 VGA compatible controller: Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])                                            
CPU: Intel(R) Core(TM) i3-4170T CPU @ 3.20GHz

For reference, this is the list of i915 commits that went into 5.10.9.


commit ecca0c675bdecebdeb2f2eb76fb33520c441dacf
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 11 22:52:19 2021 +0000

    drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail
    
    commit 09aa9e45863e9e25dfbf350bae89fc3c2964482c upstream.


commit de3f572607c29f7fdd1bfd754646d08e32db0249
Author: Imre Deak <imre.deak at intel.com>
Date:   Wed Dec 9 17:39:52 2020 +0200

    drm/i915/icl: Fix initing the DSI DSC power refcount during HW readout
    
    commit 2af5268180410b874fc06be91a1b2fbb22b1be0c upstream.


commit 54c9246a47fa8559c3ec6da2048e976a4b8750f6
Author: Hans de Goede <hdegoede at redhat.com>
Date:   Wed Nov 18 13:40:58 2020 +0100

    drm/i915/dsi: Use unconditional msleep for the panel_on_delay when there is no reset-deassert MIPI-sequence
    
    commit 00cb645fd7e29bdd20967cd20fa8f77bcdf422f9 upstream.


commit 0a34addcdbd9e03e3f3d09bcd5a1719d90b2d637
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Fri Jan 8 17:28:41 2021 +0200

    drm/i915/backlight: fix CPU mode backlight takeover on LPT
    
    commit bb83d5fb550bb7db75b29e6342417fda2bbb691c upstream.


commit 48b8c6689efa7cd65a72f620940a4f234b944b73
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 11 22:52:18 2021 +0000

    drm/i915/gt: Limit VFE threads based on GT
    
    commit ffaf97899c4a58b9fefb11534f730785443611a8 upstream.


commit 481e27f050732b8c680f26287dd44967fddf9a79
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 11 22:52:20 2021 +0000

    drm/i915: Allow the sysadmin to override security mitigations
    
    commit 984cadea032b103c5824a5f29d0a36b3e9df6333 upstream.


Regards