[Bug 111541] Cursor sprite sometimes not showed since linux 5.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111541

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Hmm. Yeah, looks like both the kernel and hw think the cursor should be
enabled. 

One theory might be that the alpha channel is all zeroes. Would need to dump
the relevant chunk of memory to confirm.

I have a tool to do just that, and I just pimped it to handle cursors.

git://github.com/vsyrjala/intel-gpu-tools.git gtt_dump_2
intel_gtt_dump -f cursor.png -C a # dumps cursor image for pipe A

The downside of my tool is that it requires a kernel patch on PAT machines
because the kernel is silly and won't allow you to mmap RAM via /dev/mem:
git://github.com/vsyrjala/linux.git pat_vs_dev_mem

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