https://bugs.freedesktop.org/show_bug.cgi?id=79756

--- Comment #4 from Marti Raudsepp <marti@juffo.org> ---
Created attachment 100599
  --> https://bugs.freedesktop.org/attachment.cgi?id=100599&action=edit
gdm-Xorg-:1.log

Oh, after waiting long enough, I also see the following messages in Xorg log...
There are multiple such traces in the attached file.

[mi] EQ overflowing.  Additional events will be discarded until existing events
are processed.

Backtrace:
0: /usr/bin/Xorg (xorg_backtrace+0x48) [0x584b08]
1: /usr/bin/Xorg (mieqEnqueue+0x22b) [0x566b7b]
2: /usr/bin/Xorg (QueuePointerEvents+0x52) [0x44cc72]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f417ddd9000+0x60ba)
[0x7f417dddf0ba]
4: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f417ddd9000+0x657d)
[0x7f417dddf57d]
5: /usr/bin/Xorg (0x400000+0x72f08) [0x472f08]
6: /usr/bin/Xorg (0x400000+0x9b4b0) [0x49b4b0]
7: /usr/lib/libpthread.so.0 (0x7f4184c61000+0xf4b0) [0x7f4184c704b0]
8: /usr/lib/libpthread.so.0 (0x7f4184c61000+0xe38c) [0x7f4184c6f38c]
9: /usr/lib/libpthread.so.0 (0x7f4184c61000+0x9b3c) [0x7f4184c6ab3c]
10: /usr/lib/libpthread.so.0 (pthread_mutex_lock+0x6a) [0x7f4184c6a91a]
11: /usr/lib/libEGL.so.1 (eglCreateImageKHR+0x3e) [0x7f4181976fde]
12: /usr/lib/xorg/modules/libglamoregl.so
(glamor_egl_create_textured_pixmap+0xf1) [0x7f4181b95e21]
13: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f417e3f6000+0x4bac0)
[0x7f417e441ac0]
14: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f417e3f6000+0x4be26)
[0x7f417e441e26]
15: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f417e3f6000+0x42819)
[0x7f417e438819]
16: /usr/bin/Xorg (0x400000+0x1554c3) [0x5554c3]
17: /usr/bin/Xorg (0x400000+0x15628f) [0x55628f]
18: /usr/bin/Xorg (DRI2GetBuffersWithFormat+0x10) [0x556690]
19: /usr/lib/xorg/modules/extensions/libglx.so (0x7f417e862000+0x2c661)
[0x7f417e88e661]
20: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x6886a)
[0x7f417d1c286a]
21: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x6693a)
[0x7f417d1c093a]
22: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x1bfade)
[0x7f417d319ade]
23: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x1c0c48)
[0x7f417d31ac48]
24: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x192a70)
[0x7f417d2eca70]
25: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x1a6a85)
[0x7f417d300a85]
26: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x17b627)
[0x7f417d2d5627]
27: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x1627fc)
[0x7f417d2bc7fc]
28: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0x178684)
[0x7f417d2d2684]
29: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f417d15a000+0xa2433)
[0x7f417d1fc433]
30: /usr/lib/libEGL.so.1 (0x7f4181970000+0x10ffe) [0x7f4181980ffe]
31: /usr/lib/libEGL.so.1 (eglMakeCurrent+0x1cd) [0x7f418197940d]
32: /usr/lib/xorg/modules/libglamoregl.so (glamor_egl_make_current+0x48)
[0x7f4181b95c08]
33: /usr/lib/libglamor.so.0 (glamor_block_handler+0x69) [0x7f418152dc69]
34: /usr/bin/Xorg (_CallCallbacks+0x34) [0x43ad64]
35: /usr/bin/Xorg (WriteToClient+0x1a6) [0x588096]
36: /usr/lib/xorg/modules/extensions/libglx.so (0x7f417e862000+0x11761)
[0x7f417e873761]
37: /usr/lib/xorg/modules/extensions/libglx.so (0x7f417e862000+0x251d0)
[0x7f417e8871d0]
38: /usr/bin/Xorg (0x400000+0x35c8e) [0x435c8e]
39: /usr/bin/Xorg (0x400000+0x39aaa) [0x439aaa]
40: /usr/lib/libc.so.6 (__libc_start_main+0xf0) [0x7f41838ce000]
41: /usr/bin/Xorg (0x400000+0x2507e) [0x42507e]

[mi] These backtraces from mieqEnqueue may point to a culprit higher up the
stack.
[mi] mieq is *NOT* the cause.  It is a victim.
....

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