tried the patch in comment #3, #4 and #6 on 16.04 and 14.04, got below
result:
1, 14.04 (kernel 3.19.0-37, u-s-d: 14.04.20151012, compiz 2014.20150313)
1.1 without patch
u-s-d and compiz crashed and system logout after adjust resolution by use
display setting at u-c-c (unity-control-center) or use command "xrandr -s 1"
1.2 with patch
1.2.1, can not set the resolution by use display setting at u-c-c, the
error info please refer to attachment setting-error.jpg
1.2.2, can change resolution by command "xrandr -s 1" successfully.
2, 16.04 (kernel 4.4.0-21, u-s-d: 16.04.20160209, compiz 16.04.20160415)
2.1 without patch
u-s-d crashed once when change resolution by display setting or cmd, but
system will not logout, user can continue change resolution without crash.
2.2 with patch
same result with without patch.
** Attachment added: "setting-error.jpg"
https://bugs.launchpad.net/ubuntu/+source/unity-settings-daemon/+bug/1503758/+attachment/4663725/+files/setting-error.jpg
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https://bugs.launchpad.net/bugs/1503758
Title:
/usr/lib/unity-settings-daemon/unity-settings-
daemon:5:XIQueryDevice:xdevice_get_dimensions:input_info_find_size_match:get_mappable_output_info:do_touchscreen_mapping
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