Bug 98270

I recently switched from NVidia to Nouveau driver, on a dual-head Gentoo AMD64 computer.

Only with Google Maps on Firefox (version 45, 46 or 49), the 'default' maps loads ok but anything that would require to redisplay the map's tiles leads quickly to total freeze of the computer. 

 Xorg.0.log file contains several error backtraces :

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
(EE) 
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x589e96]
(EE) 1: /usr/bin/X (mieqEnqueue+0x24b) [0x56bddb]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x52) [0x44db52]
(EE) 3: /usr/lib64/xorg/modules/input/evdev_drv.so (0x7fd526d53000+0x623f) [0x7fd526d5923f]
(EE) 4: /usr/lib64/xorg/modules/input/evdev_drv.so (0x7fd526d53000+0x6acd) [0x7fd526d59acd]
(EE) 5: /usr/bin/X (0x400000+0x74ea8) [0x474ea8]
(EE) 6: /usr/bin/X (0x400000+0x99da7) [0x499da7]
(EE) 7: /lib64/libc.so.6 (0x7fd53212e000+0x332d0) [0x7fd5321612d0]
(EE) 8: /lib64/libc.so.6 (ioctl+0x5) [0x7fd53220f825]
(EE) 9: /usr/lib64/libdrm.so.2 (drmIoctl+0x28) [0x7fd5332bfc68]
(EE) 10: /usr/lib64/libdrm.so.2 (drmCommandWrite+0x1b) [0x7fd5332c298b]
(EE) 11: /usr/lib64/libdrm_nouveau.so.2 (nouveau_bo_wait+0xbc) [0x7fd52da9743c]
(EE) 12: /usr/lib64/xorg/modules/drivers/nouveau_drv.so (0x7fd52dc9c000+0x7f2d) [0x7fd52dca3f2d]
(EE) 13: /usr/lib64/xorg/modules/libexa.so (0x7fd52d455000+0x586b) [0x7fd52d45a86b]
(EE) 14: /usr/lib64/xorg/modules/libexa.so (0x7fd52d455000+0x7f70) [0x7fd52d45cf70]
(EE) 15: /usr/lib64/xorg/modules/libexa.so (0x7fd52d455000+0x10c01) [0x7fd52d465c01]
(EE) 16: /usr/bin/X (0x400000+0x114ea7) [0x514ea7]
(EE) 17: /usr/bin/X (0x400000+0x31a86) [0x431a86]
(EE) 18: /usr/bin/X (0x400000+0x3553f) [0x43553f]
(EE) 19: /usr/bin/X (0x400000+0x395b3) [0x4395b3]
(EE) 20: /lib64/libc.so.6 (__libc_start_main+0xf0) [0x7fd53214e620]
(EE) 21: /usr/bin/X (_start+0x29) [0x423919]
(EE) 
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.

Hardware : 
02:00.0 VGA compatible controller: NVIDIA Corporation GF106M [GeForce GTX 460M] (rev a1)

Software :
Kernel 4.1.15
xorg-server 1.18.4
nouveau driver 1.0.12