[Mesa-dev] [Bug 81139] Rendering sometimes halts in waiting for back buffers with dri3 & xwayland

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81139

--- Comment #5 from Boyan Ding <stu_dby at 126.com> ---
I think it's not about xcb bug.
I turned on DebugPresent output and that's what I get when running glxgears:
q 1 0x2bf5a30   351258: 00400006 -> 00400002 (crtc (nil))
    e 1 ust 5854416007 msc 351258
    c 0x2bf5a30   351258: 00400006 -> 00400002
    i 00400006
    d 1 0x2bf5a30   351258: 00400006 -> 00400002
q 2 0x35e42a0 111514530873345: 00400006 -> 00400002 (crtc (nil))
    e 2 ust 5854416646 msc 351258
    c 0x35e42a0   351258: 00400006 -> 00400002
    i 00400006
    d 2 0x35e42a0 111514530873345: 00400006 -> 00400002
q 3 0x35e42a0 111514530873346: 00400006 -> 00400002 (crtc (nil))
    e 3 ust 5854417065 msc 351258
    c 0x35e42a0   351258: 00400006 -> 00400002
    i 00400006
    d 3 0x35e42a0 111514530873346: 00400006 -> 00400002
q 4 0x35e42a0 463856467970: 00400006 -> 00400002 (crtc (nil))
(both the output and the animation stop here)

That means the event waited for is even not sent.

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