[Bug 108355] Civilization VI - Artifacts in mouse cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108355

--- Comment #20 from Hadrien Nilsson <freedesktop at psydk.org> ---
(In reply to Michel Dänzer from comment #19)
> (In reply to Hadrien Nilsson from comment #18)
> > Anyway, I tested your branch (cursor-unpremultiply-overflow-no-gamma) and
> > unfortunately it freezes my system as soon as the Civilization VI cursor is
> > about to be shown.
> 
> Weird. Can you still access the system via SSH? Does Xorg die (if so, please
> get the Xorg log file and/or its stderr output), or enter an infinite loop
> (if so, can you attach gdb to it and get a backtrace)?

I did some tests today: I can still access to my computer from another one via
SSH. Xorg is running at 100% of cpu. I could pause the process with gdb. The
process is stuck in drmmode_do_load_cursor_argb(). This loop in particular:

retry:
                for (i = 0; i < cursor_size; i++) {
                        argb = image[i];
                        if (!drmmode_cursor_pixel(crtc, &argb, &premultiplied,
                                                  &apply_gamma))
                                goto retry;

                        ptr[i] = cpu_to_le32(argb);

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