[Mesa-dev] [Bug 104926] swrast: Mesa 17.3.3 produces: HW cursor for format 875713089 not supported

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104926

            Bug ID: 104926
           Summary: swrast: Mesa 17.3.3 produces:  HW cursor for format
                    875713089 not supported
           Product: Mesa
           Version: 17.3
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: wblaszcz at bigpond.net.au
        QA Contact: mesa-dev at lists.freedesktop.org

Under a guest VM running Gnome 3.26.2 Wayland, the mouse cursor becomes laggy,
and a double cursor (both host and guest I presume) when Mesa 17.3.x is
installed including the latest, 17.3.3. Reverting back to 17.2.8 and the
problem goes away.
In the system logs the following can be found:

Feb 03 22:03:19 lfs13 org.gnome.Shell.desktop[651]: Window manager warning: HW
cursor for format 875713089 not supported

I've done a git bisect: 
e14fe41e0bf5d82c0b22eda2f8dcea058ac6e610 is the first bad commit

Tracking it even further, it seems to be related to __DRI_IMAGE being changed
from 15 to 17 in src/gallium/state_trackers/dri/dri2.c .

More info:

GL_RENDERER: llvmpipe (LLVM 5.0, 256 bits)
kms_swrast_dri.so

I wrote a simple test program, and the following function returns false under
17.3.3, and returns true under 17.2.8.

gbm_device_is_format_supported (gbm, gbm_format, GBM_BO_USE_CURSOR |
GBM_BO_USE_WRITE)

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