[Merge] ~jeff250/ubuntu/+source/xorg-server:tearfree into ubuntu/+source/xorg-server:ubuntu/devel

[git-ubuntu bot]

You have been requested to review the proposed merge of ~jeff250/ubuntu/+source/xorg-server:tearfree into ubuntu/+source/xorg-server:ubuntu/devel.

For more details, see:
https://code.launchpad.net/~jeff250/ubuntu/+source/xorg-server/+git/xorg-server/+merge/457781

While the Xorg server can eliminate tearing in many cases, in others, such as in the absence of a compositor or in the presence of xrandr rotation or scaling, tearing may still be present (see, e.g., [1,2,3]).  To address these cases, this merge request contains Sultan Alsawaf's patches from [4] (specifically, from [5]) and from [6] to implement "TearFree" mode in the modesetting driver.  "TearFree" mode is considered mature and robust by upstream and has since been enabled by default in the modesetting driver [7], and the feature is similar to the "TearFree" modes already implemented in other DDX drivers.  However, while this merge request implements "TearFree" mode for the modesetting driver, this merge request does not yet include upstream's patches to enable the mode by default.  Instead, enabling "TearFree" in the modesetting driver will still require something such as the following added to xorg.conf:

Section "Device"
    Identifier "Graphics Adapter"
    Driver "modesetting"
    Option "TearFree" "true"
EndSection

[1] https://bugs.launchpad.net/xorg-server/+bug/1754284
[2] https://bugs.launchpad.net/xorg-server/+bug/1846398
[3] https://bugs.launchpad.net/xorg-server/+bug/1853094
[4] https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1006
[5] https://github.com/kerneltoast/xserver/tree/new-tearfree-21.1.5
[6] https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1042
[7] https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1224

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