Mouse no longer working : works in 4.18 : doesn't work in 4.18.5

Mouse no longer working : works in 4.18 : doesn't work in 4.18.5

[hanasaki]

Mouse worked fine in 4.18 however does not work in 4.18.5  Both kernels 
were built with exactly the same .config file (copied from the 4.18 
build dir to the un-tar'ed 4.18.5 directory to build)

Any input on root cause and fix / workaround is appreciated.

"Doesn't work" means : syslog and kernel show that:
1. the kernel finds the mouse
2. gpm finds the mouse and detects its protocol
3. mouse cursor does not move and buttons do not work
	: not in gpm
	: not in X
4. syslog and kernel .config are the same for both versions

Below is the output from syslog and dmesg.

Update : same issue in 4.18.6 @ 20180906

========= dmesg
     6.925981] usbcore: registered new interface driver usbhid
[    6.925982] usbhid: USB HID core driver
[    6.927425] usbcore: registered new interface driver usbmouse
[    6.942113] input: PixArt USB Optical Mouse as 
/devices/pci0000:00/0000:00:14.0/usb2/2-10/2-10:1.0/0003:093A:2510.0001/input/input17
[    6.942207] hid-generic 0003:093A:2510.0001: input,hidraw0: USB HID 
v1.11 Mouse [PixArt USB Optical Mouse] on usb-0000:00:14.0-10/input0

========= Syslog
Sep  6 23:26:22 russia /usr/sbin/gpm[2699]: *** info 
[daemon/startup.c(131)]:
Sep  6 23:26:22 russia /usr/sbin/gpm[2699]: Started gpm successfully. 
Entered daemon mode.
Sep  6 23:26:23 russia /usr/sbin/gpm[2699]: *** info [mice.c(2059)]:
Sep  6 23:26:23 russia /usr/sbin/gpm[2699]: Detected EXPS/2 protocol mouse.

TIA / Thanks.