Bug 93204

Summary:	"missing topmost touch" when using touchpad
Product:	Wayland	Reporter:	Timm Bäder <mail>
Component:	libinput	Assignee:	Peter Hutterer <peter.hutterer>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	peter.hutterer
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Timm Bäder 2015-12-02 07:10:11 UTC

From https://bugs.freedesktop.org/show_bug.cgi?id=93165:

Here I selected the touchpad and reproduced the "missing topmost touch" output, I *think* by lifting both fingers up at the same time:

# EVEMU 1.3
# Kernel: 4.2.5-1-ARCH
# DMI: dmi:bvnLENOVO:bvr6UET54WW(1.34):bd09/16/2010:svnLENOVO:pn292422G:pvrThinkPadT410s:rvnLENOVO:rn292422G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
# Input device name: "SynPS/2 Synaptics TouchPad"
# Input device ID: bus 0x11 vendor 0x02 product 0x07 version 0x1b1
# Supported events:
#   Event type 0 (EV_SYN)
#     Event code 0 (SYN_REPORT)
#     Event code 1 (SYN_CONFIG)
#     Event code 2 (SYN_MT_REPORT)
#     Event code 3 (SYN_DROPPED)
#     Event code 4 ((null))
#     Event code 5 ((null))
#     Event code 6 ((null))
#     Event code 7 ((null))
#     Event code 8 ((null))
#     Event code 9 ((null))
#     Event code 10 ((null))
#     Event code 11 ((null))
#     Event code 12 ((null))
#     Event code 13 ((null))
#     Event code 14 ((null))
#   Event type 1 (EV_KEY)
#     Event code 272 (BTN_LEFT)
#     Event code 273 (BTN_RIGHT)
#     Event code 325 (BTN_TOOL_FINGER)
#     Event code 330 (BTN_TOUCH)
#     Event code 333 (BTN_TOOL_DOUBLETAP)
#     Event code 334 (BTN_TOOL_TRIPLETAP)
#   Event type 3 (EV_ABS)
#     Event code 0 (ABS_X)
#       Value   4308
#       Min     1472
#       Max     5888
#       Fuzz       0
#       Flat       0
#       Resolution 75
#     Event code 1 (ABS_Y)
#       Value   3389
#       Min     1408
#       Max     4820
#       Fuzz       0
#       Flat       0
#       Resolution 105
#     Event code 24 (ABS_PRESSURE)
#       Value      0
#       Min        0
#       Max      255
#       Fuzz       0
#       Flat       0
#       Resolution 0
#     Event code 28 (ABS_TOOL_WIDTH)
#       Value      0
#       Min        0
#       Max       15
#       Fuzz       0
#       Flat       0
#       Resolution 0
#     Event code 47 (ABS_MT_SLOT)
#       Value      0
#       Min        0
#       Max        1
#       Fuzz       0
#       Flat       0
#       Resolution 0
#     Event code 53 (ABS_MT_POSITION_X)
#       Value      0
#       Min     1472
#       Max     5888
#       Fuzz       0
#       Flat       0
#       Resolution 75
#     Event code 54 (ABS_MT_POSITION_Y)
#       Value      0
#       Min     1408
#       Max     4820
#       Fuzz       0
#       Flat       0
#       Resolution 105
#     Event code 57 (ABS_MT_TRACKING_ID)
#       Value      0
#       Min        0
#       Max    65535
#       Fuzz       0
#       Flat       0
#       Resolution 0
# Properties:
#   Property  type 0 (INPUT_PROP_POINTER)
#   Property  type 3 (INPUT_PROP_SEMI_MT)
N: SynPS/2 Synaptics TouchPad
I: 0011 0002 0007 01b1
P: 09 00 00 00 00 00 00 00
B: 00 0b 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 03 00 00 00 00 00
B: 01 20 64 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 02 00 00 00 00 00 00 00 00
B: 03 03 00 00 11 00 80 60 02
B: 04 00 00 00 00 00 00 00 00
B: 05 00 00 00 00 00 00 00 00
B: 11 00 00 00 00 00 00 00 00
B: 12 00 00 00 00 00 00 00 00
B: 14 00 00 00 00 00 00 00 00
B: 15 00 00 00 00 00 00 00 00
B: 15 00 00 00 00 00 00 00 00
A: 00 1472 5888 0 0 75
A: 01 1408 4820 0 0 105
A: 18 0 255 0 0 0
A: 1c 0 15 0 0 0
A: 2f 0 1 0 0 0
A: 35 1472 5888 0 0 75
A: 36 1408 4820 0 0 105
A: 39 0 65535 0 0 0
################################
#      Waiting for events      #
################################
E: 0.000001 0003 0039 0747	# EV_ABS / ABS_MT_TRACKING_ID   747
E: 0.000001 0003 0035 3337	# EV_ABS / ABS_MT_POSITION_X    3337
E: 0.000001 0003 0036 4363	# EV_ABS / ABS_MT_POSITION_Y    4363
E: 0.000001 0001 014a 0001	# EV_KEY / BTN_TOUCH            1
E: 0.000001 0003 0000 3337	# EV_ABS / ABS_X                3337
E: 0.000001 0003 0001 4363	# EV_ABS / ABS_Y                4363
E: 0.000001 0003 0018 0060	# EV_ABS / ABS_PRESSURE         60
E: 0.000001 0003 001c 0004	# EV_ABS / ABS_TOOL_WIDTH       4
E: 0.000001 0001 0145 0001	# EV_KEY / BTN_TOOL_FINGER      1
E: 0.000001 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +0ms
E: 0.013377 0003 0035 3322	# EV_ABS / ABS_MT_POSITION_X    3322
E: 0.013377 0003 0036 4354	# EV_ABS / ABS_MT_POSITION_Y    4354
E: 0.013377 0003 0000 3322	# EV_ABS / ABS_X                3322
E: 0.013377 0003 0001 4354	# EV_ABS / ABS_Y                4354
E: 0.013377 0003 0018 0063	# EV_ABS / ABS_PRESSURE         63
E: 0.013377 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +13ms
E: 0.025559 0003 0035 3310	# EV_ABS / ABS_MT_POSITION_X    3310
E: 0.025559 0003 0036 4342	# EV_ABS / ABS_MT_POSITION_Y    4342
E: 0.025559 0003 0000 3310	# EV_ABS / ABS_X                3310
E: 0.025559 0003 0001 4342	# EV_ABS / ABS_Y                4342
E: 0.025559 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.037375 0003 0035 3304	# EV_ABS / ABS_MT_POSITION_X    3304
E: 0.037375 0003 0036 4333	# EV_ABS / ABS_MT_POSITION_Y    4333
E: 0.037375 0003 0000 3304	# EV_ABS / ABS_X                3304
E: 0.037375 0003 0001 4333	# EV_ABS / ABS_Y                4333
E: 0.037375 0003 0018 0064	# EV_ABS / ABS_PRESSURE         64
E: 0.037375 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.049269 0003 0035 3306	# EV_ABS / ABS_MT_POSITION_X    3306
E: 0.049269 0003 0036 4334	# EV_ABS / ABS_MT_POSITION_Y    4334
E: 0.049269 0003 0000 3306	# EV_ABS / ABS_X                3306
E: 0.049269 0003 0001 4334	# EV_ABS / ABS_Y                4334
E: 0.049269 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.062280 0003 0035 3311	# EV_ABS / ABS_MT_POSITION_X    3311
E: 0.062280 0003 0036 4340	# EV_ABS / ABS_MT_POSITION_Y    4340
E: 0.062280 0003 0000 3311	# EV_ABS / ABS_X                3311
E: 0.062280 0003 0001 4340	# EV_ABS / ABS_Y                4340
E: 0.062280 0003 0018 0065	# EV_ABS / ABS_PRESSURE         65
E: 0.062280 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +13ms
E: 0.086986 0003 0035 3318	# EV_ABS / ABS_MT_POSITION_X    3318
E: 0.086986 0003 0036 4350	# EV_ABS / ABS_MT_POSITION_Y    4350
E: 0.086986 0003 0000 3318	# EV_ABS / ABS_X                3318
E: 0.086986 0003 0001 4350	# EV_ABS / ABS_Y                4350
E: 0.086986 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.098652 0003 0035 3323	# EV_ABS / ABS_MT_POSITION_X    3323
E: 0.098652 0003 0036 4356	# EV_ABS / ABS_MT_POSITION_Y    4356
E: 0.098652 0003 0000 3323	# EV_ABS / ABS_X                3323
E: 0.098652 0003 0001 4356	# EV_ABS / ABS_Y                4356
E: 0.098652 0003 0018 0066	# EV_ABS / ABS_PRESSURE         66
E: 0.098652 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.111662 0003 0035 3325	# EV_ABS / ABS_MT_POSITION_X    3325
E: 0.111662 0003 0036 4359	# EV_ABS / ABS_MT_POSITION_Y    4359
E: 0.111662 0003 0000 3325	# EV_ABS / ABS_X                3325
E: 0.111662 0003 0001 4359	# EV_ABS / ABS_Y                4359
E: 0.111662 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +13ms
E: 0.123351 0003 0035 3323	# EV_ABS / ABS_MT_POSITION_X    3323
E: 0.123351 0003 0036 4360	# EV_ABS / ABS_MT_POSITION_Y    4360
E: 0.123351 0003 0000 3323	# EV_ABS / ABS_X                3323
E: 0.123351 0003 0001 4360	# EV_ABS / ABS_Y                4360
E: 0.123351 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.136363 0003 0035 3319	# EV_ABS / ABS_MT_POSITION_X    3319
E: 0.136363 0003 0036 4356	# EV_ABS / ABS_MT_POSITION_Y    4356
E: 0.136363 0003 0000 3319	# EV_ABS / ABS_X                3319
E: 0.136363 0003 0001 4356	# EV_ABS / ABS_Y                4356
E: 0.136363 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +13ms
E: 0.160221 0003 0035 3311	# EV_ABS / ABS_MT_POSITION_X    3311
E: 0.160221 0003 0036 4352	# EV_ABS / ABS_MT_POSITION_Y    4352
E: 0.160221 0003 0000 3311	# EV_ABS / ABS_X                3311
E: 0.160221 0003 0001 4352	# EV_ABS / ABS_Y                4352
E: 0.160221 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.171949 0003 0035 3307	# EV_ABS / ABS_MT_POSITION_X    3307
E: 0.171949 0003 0036 4348	# EV_ABS / ABS_MT_POSITION_Y    4348
E: 0.171949 0003 0000 3307	# EV_ABS / ABS_X                3307
E: 0.171949 0003 0001 4348	# EV_ABS / ABS_Y                4348
E: 0.171949 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +11ms
E: 0.184980 0003 0035 3303	# EV_ABS / ABS_MT_POSITION_X    3303
E: 0.184980 0003 0000 3303	# EV_ABS / ABS_X                3303
E: 0.184980 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +13ms
E: 0.196818 0003 0035 3300	# EV_ABS / ABS_MT_POSITION_X    3300
E: 0.196818 0003 0036 4349	# EV_ABS / ABS_MT_POSITION_Y    4349
E: 0.196818 0003 0000 3300	# EV_ABS / ABS_X                3300
E: 0.196818 0003 0001 4349	# EV_ABS / ABS_Y                4349
E: 0.196818 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.208783 0003 0035 3304	# EV_ABS / ABS_MT_POSITION_X    3304
E: 0.208783 0003 0036 4353	# EV_ABS / ABS_MT_POSITION_Y    4353
E: 0.208783 0003 0000 3304	# EV_ABS / ABS_X                3304
E: 0.208783 0003 0001 4353	# EV_ABS / ABS_Y                4353
E: 0.208783 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.233474 0003 0035 3456	# EV_ABS / ABS_MT_POSITION_X    3456
E: 0.233474 0003 0036 4364	# EV_ABS / ABS_MT_POSITION_Y    4364
E: 0.233474 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.233474 0003 0039 0748	# EV_ABS / ABS_MT_TRACKING_ID   748
E: 0.233474 0003 0035 3547	# EV_ABS / ABS_MT_POSITION_X    3547
E: 0.233474 0003 0036 1234	# EV_ABS / ABS_MT_POSITION_Y    1234
E: 0.233474 0003 0000 3547	# EV_ABS / ABS_X                3547
E: 0.233474 0003 0001 4364	# EV_ABS / ABS_Y                4364
E: 0.233474 0003 0018 0068	# EV_ABS / ABS_PRESSURE         68
E: 0.233474 0003 001c 0005	# EV_ABS / ABS_TOOL_WIDTH       5
E: 0.233474 0001 0145 0000	# EV_KEY / BTN_TOOL_FINGER      0
E: 0.233474 0001 014d 0001	# EV_KEY / BTN_TOOL_DOUBLETAP   1
E: 0.233474 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.258075 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.258075 0003 0035 3642	# EV_ABS / ABS_MT_POSITION_X    3642
E: 0.258075 0003 0036 4382	# EV_ABS / ABS_MT_POSITION_Y    4382
E: 0.258075 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.258075 0003 0035 3658	# EV_ABS / ABS_MT_POSITION_X    3658
E: 0.258075 0003 0036 1258	# EV_ABS / ABS_MT_POSITION_Y    1258
E: 0.258075 0003 0000 3642	# EV_ABS / ABS_X                3642
E: 0.258075 0003 0001 4382	# EV_ABS / ABS_Y                4382
E: 0.258075 0003 0018 0069	# EV_ABS / ABS_PRESSURE         69
E: 0.258075 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.282607 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.282607 0003 0035 3705	# EV_ABS / ABS_MT_POSITION_X    3705
E: 0.282607 0003 0036 4391	# EV_ABS / ABS_MT_POSITION_Y    4391
E: 0.282607 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.282607 0003 0035 3708	# EV_ABS / ABS_MT_POSITION_X    3708
E: 0.282607 0003 0036 1288	# EV_ABS / ABS_MT_POSITION_Y    1288
E: 0.282607 0003 0000 3705	# EV_ABS / ABS_X                3705
E: 0.282607 0003 0001 4391	# EV_ABS / ABS_Y                4391
E: 0.282607 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.307816 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.307816 0003 0035 3732	# EV_ABS / ABS_MT_POSITION_X    3732
E: 0.307816 0003 0036 4389	# EV_ABS / ABS_MT_POSITION_Y    4389
E: 0.307816 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.307816 0003 0035 3742	# EV_ABS / ABS_MT_POSITION_X    3742
E: 0.307816 0003 0036 1304	# EV_ABS / ABS_MT_POSITION_Y    1304
E: 0.307816 0003 0000 3732	# EV_ABS / ABS_X                3732
E: 0.307816 0003 0001 4389	# EV_ABS / ABS_Y                4389
E: 0.307816 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.331079 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.331079 0003 0035 3726	# EV_ABS / ABS_MT_POSITION_X    3726
E: 0.331079 0003 0036 4362	# EV_ABS / ABS_MT_POSITION_Y    4362
E: 0.331079 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.331079 0003 0035 3734	# EV_ABS / ABS_MT_POSITION_X    3734
E: 0.331079 0003 0036 1288	# EV_ABS / ABS_MT_POSITION_Y    1288
E: 0.331079 0003 0000 3726	# EV_ABS / ABS_X                3726
E: 0.331079 0003 0001 4362	# EV_ABS / ABS_Y                4362
E: 0.331079 0003 0018 0071	# EV_ABS / ABS_PRESSURE         71
E: 0.331079 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.356044 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.356044 0003 0035 3699	# EV_ABS / ABS_MT_POSITION_X    3699
E: 0.356044 0003 0036 4328	# EV_ABS / ABS_MT_POSITION_Y    4328
E: 0.356044 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.356044 0003 0035 3702	# EV_ABS / ABS_MT_POSITION_X    3702
E: 0.356044 0003 0036 1242	# EV_ABS / ABS_MT_POSITION_Y    1242
E: 0.356044 0003 0000 3699	# EV_ABS / ABS_X                3699
E: 0.356044 0003 0001 4328	# EV_ABS / ABS_Y                4328
E: 0.356044 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.381093 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.381093 0003 0035 3668	# EV_ABS / ABS_MT_POSITION_X    3668
E: 0.381093 0003 0036 4314	# EV_ABS / ABS_MT_POSITION_Y    4314
E: 0.381093 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.381093 0003 0035 3674	# EV_ABS / ABS_MT_POSITION_X    3674
E: 0.381093 0003 0036 1212	# EV_ABS / ABS_MT_POSITION_Y    1212
E: 0.381093 0003 0000 3674	# EV_ABS / ABS_X                3674
E: 0.381093 0003 0001 4314	# EV_ABS / ABS_Y                4314
E: 0.381093 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.405393 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.405393 0003 0035 3670	# EV_ABS / ABS_MT_POSITION_X    3670
E: 0.405393 0003 0036 4315	# EV_ABS / ABS_MT_POSITION_Y    4315
E: 0.405393 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.405393 0003 0035 3673	# EV_ABS / ABS_MT_POSITION_X    3673
E: 0.405393 0003 0036 1224	# EV_ABS / ABS_MT_POSITION_Y    1224
E: 0.405393 0003 0000 3673	# EV_ABS / ABS_X                3673
E: 0.405393 0003 0001 4315	# EV_ABS / ABS_Y                4315
E: 0.405393 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.430151 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.430151 0003 0036 4322	# EV_ABS / ABS_MT_POSITION_Y    4322
E: 0.430151 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.430151 0003 0035 3674	# EV_ABS / ABS_MT_POSITION_X    3674
E: 0.430151 0003 0036 1238	# EV_ABS / ABS_MT_POSITION_Y    1238
E: 0.430151 0003 0000 3674	# EV_ABS / ABS_X                3674
E: 0.430151 0003 0001 4322	# EV_ABS / ABS_Y                4322
E: 0.430151 0003 0018 0068	# EV_ABS / ABS_PRESSURE         68
E: 0.430151 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.453655 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.453655 0003 0035 3676	# EV_ABS / ABS_MT_POSITION_X    3676
E: 0.453655 0003 0036 4326	# EV_ABS / ABS_MT_POSITION_Y    4326
E: 0.453655 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.453655 0003 0035 3678	# EV_ABS / ABS_MT_POSITION_X    3678
E: 0.453655 0003 0000 3678	# EV_ABS / ABS_X                3678
E: 0.453655 0003 0001 4326	# EV_ABS / ABS_Y                4326
E: 0.453655 0003 0018 0069	# EV_ABS / ABS_PRESSURE         69
E: 0.453655 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +23ms
E: 0.478841 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.478841 0003 0035 3682	# EV_ABS / ABS_MT_POSITION_X    3682
E: 0.478841 0003 0036 4318	# EV_ABS / ABS_MT_POSITION_Y    4318
E: 0.478841 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.478841 0003 0035 3686	# EV_ABS / ABS_MT_POSITION_X    3686
E: 0.478841 0003 0036 1242	# EV_ABS / ABS_MT_POSITION_Y    1242
E: 0.478841 0003 0000 3686	# EV_ABS / ABS_X                3686
E: 0.478841 0003 0001 4318	# EV_ABS / ABS_Y                4318
E: 0.478841 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.502489 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.502489 0003 0035 3680	# EV_ABS / ABS_MT_POSITION_X    3680
E: 0.502489 0003 0036 4300	# EV_ABS / ABS_MT_POSITION_Y    4300
E: 0.502489 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.502489 0003 0035 3683	# EV_ABS / ABS_MT_POSITION_X    3683
E: 0.502489 0003 0036 1224	# EV_ABS / ABS_MT_POSITION_Y    1224
E: 0.502489 0003 0000 3683	# EV_ABS / ABS_X                3683
E: 0.502489 0003 0001 4300	# EV_ABS / ABS_Y                4300
E: 0.502489 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +24ms
E: 0.527615 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.527615 0003 0035 3418	# EV_ABS / ABS_MT_POSITION_X    3418
E: 0.527615 0003 0036 4182	# EV_ABS / ABS_MT_POSITION_Y    4182
E: 0.527615 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.527615 0003 0035 3564	# EV_ABS / ABS_MT_POSITION_X    3564
E: 0.527615 0003 0036 1232	# EV_ABS / ABS_MT_POSITION_Y    1232
E: 0.527615 0001 014a 0000	# EV_KEY / BTN_TOUCH            0
E: 0.527615 0003 0000 3418	# EV_ABS / ABS_X                3418
E: 0.527615 0003 0001 4182	# EV_ABS / ABS_Y                4182
E: 0.527615 0003 0018 0019	# EV_ABS / ABS_PRESSURE         19
E: 0.527615 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +25ms
E: 0.539895 0003 002f 0000	# EV_ABS / ABS_MT_SLOT          0
E: 0.539895 0003 0039 -001	# EV_ABS / ABS_MT_TRACKING_ID   -1
E: 0.539895 0003 002f 0001	# EV_ABS / ABS_MT_SLOT          1
E: 0.539895 0003 0039 -001	# EV_ABS / ABS_MT_TRACKING_ID   -1
E: 0.539895 0003 0018 0003	# EV_ABS / ABS_PRESSURE         3
E: 0.539895 0003 001c 0000	# EV_ABS / ABS_TOOL_WIDTH       0
E: 0.539895 0001 014d 0000	# EV_KEY / BTN_TOOL_DOUBLETAP   0
E: 0.539895 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.551846 0003 0018 0001	# EV_ABS / ABS_PRESSURE         1
E: 0.551846 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.563845 0003 0018 0000	# EV_ABS / ABS_PRESSURE         0
E: 0.563845 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +12ms
E: 0.944121 0003 0018 0001	# EV_ABS / ABS_PRESSURE         1
E: 0.944121 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +381ms
E: 0.955648 0003 0018 0000	# EV_ABS / ABS_PRESSURE         0
E: 0.955648 0000 0000 0000	# ------------ SYN_REPORT (0) ---------- +11ms

Comment 1 Peter Hutterer 2015-12-02 08:41:24 UTC

This touchpad does hover touches, so while the touch ends in the second-to-last event, the touches end in the subsequent event. Because BTN_TOUCH is up but BTN_TOOL_DOUBLETAP is down, the semi-mt code to find the top-most touch point thinks there are still fingers down and then gets confused when it can't find a touchpoint.

Comment 2 Peter Hutterer 2015-12-02 23:29:59 UTC

http://lists.freedesktop.org/archives/wayland-devel/2015-December/025897.html

Comment 3 Peter Hutterer 2015-12-03 23:38:42 UTC

commit eb1197899e87c51e8c5eb7711659302175732b64
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Wed Dec 2 10:36:30 2015 +1000

    touchpad: don't try to position fake touches when no fingers are down

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