Hello,
I installed OpenBSD 5.6 (-release) on my laptop, Acer Aspire E1-572.
Everything works great as far as I can tell except for the touchpad.
Judging by the dmesg output it is an Elantech Touchpad, version 3 using
firmware 0x454f00. I didn't configure X. Using the touchpad results in
very erratic behaviour i.e. the mouse jumps around/lags.
The dmesg shows the message:
"pms0: not in sync yet, discard input (state N)"
N switching between 0 and 3 (see dmesg below). I tried looking for the 
point of failure myself. The function issuing the "not in sync yet"
messages, void pmsinput(void *vsc, int data), is located at sys/dev/
pckbc/pms.c The only function in this source file calling pmsinput is 
pmsattach. pmsattach is included in this struct:

struct cfattach pms_ca = {
        sizeof(struct pms_softc), pmsprobe, pmsattach, NULL,
        pmsactivate
};

I didn't come any further, nor am I sure if my assertions are really
true or helpful. I have no experience or expertise with kernel source 
code.

Kind regards

dmesg output:

OpenBSD 5.6 (GENERIC.MP) #333: Fri Aug  8 00:20:21 MDT 2014
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
RTC BIOS diagnostic error 80<clock_battery>
real mem = 3989565440 (3804MB)
avail mem = 3874574336 (3695MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xe7170 (26 entries)
bios0: vendor Insyde Corp. version "V2.04" date 05/21/2013
bios0: Acer Aspire E1-572
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP UEFI FPDT ASF! HPET APIC MCFG SSDT BOOT ASPT DBGP SSDT 
SSDT SSDT DMAR
acpi0: wakeup devices P0P1(S4) EHC1(S3) XHC_(S3) HDEF(S4) TPD4(S4) PXSX(S4) 
RP03(S4) PEGP(S4) PXSX(S4) RP07(S4) PXSX(S4) RP08(S4) PEG0(S4) PEGP(S4) 
PEG1(S4) PEG2(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1596.54 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1596.31 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1596.31 MHz
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1596.31 MHz
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (P0P1)
acpiprt2 at acpi0: bus -1 (RP01)
acpiprt3 at acpi0: bus -1 (RP02)
acpiprt4 at acpi0: bus 1 (RP03)
acpiprt5 at acpi0: bus 2 (RP04)
acpiprt6 at acpi0: bus -1 (RP05)
acpiprt7 at acpi0: bus -1 (RP06)
acpiprt8 at acpi0: bus -1 (RP07)
acpiprt9 at acpi0: bus -1 (RP08)
acpiprt10 at acpi0: bus -1 (PEG0)
acpiprt11 at acpi0: bus -1 (PEG1)
acpiprt12 at acpi0: bus -1 (PEG2)
acpiec0 at acpi0
acpicpu0 at acpi0: C1, PSS
acpicpu1 at acpi0: C1, PSS
acpicpu2 at acpi0: C1, PSS
acpicpu3 at acpi0: C1, PSS
acpibat0 at acpi0: BAT1 model "14130103943515201" serial cb99 type Lion oem 
"SANYO "
acpiac0 at acpi0: AC unit online
acpibtn0 at acpi0: LID0
acpibtn1 at acpi0: PWRB
acpibtn2 at acpi0: SLPB
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: Enhanced SpeedStep 1596 MHz: speeds: 1701, 1700, 1600, 1500, 1400, 1300, 
1200, 1100, 1000, 900, 800, 782 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x09
vga1 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x09
intagp at vga1 not configured
inteldrm0 at vga1
drm0 at inteldrm0
drm: Memory usable by graphics device = 2048M
error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before 
writing to 100000
error: [drm:pid0:intel_dp_set_link_train] *ERROR* Timed out waiting for DP idle 
patterns
error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before 
writing to 64040
inteldrm0: 1920x1080
wsdisplay0 at vga1 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x09: msi
azalia0: No codecs found
"Intel 8 Series xHCI" rev 0x04 at pci0 dev 20 function 0 not configured
azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi
azalia1: codecs: Realtek ALC282
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4: msi
pci1 at ppb0 bus 1
bge0 at pci1 dev 0 function 0 "Broadcom BCM57786" rev 0x01, unknown BCM57766 
(0x57766001): msi, address 20:89:84:c9:fc:30
brgphy0 at bge0 phy 1: BCM57765 10/100/1000baseT PHY, rev. 1
sdhc0 at pci1 dev 0 function 1 "Broadcom SD Host Controller" rev 0x01: apic 2 
int 19
sdhc0 at 0x10: can't map registers
ppb1 at pci0 dev 28 function 3 "Intel 8 Series PCIE" rev 0xe4: msi
pci2 at ppb1 bus 2
"Atheros AR9565" rev 0x01 at pci2 dev 0 function 0 not configured
ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 2 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 8 Series AHCI" rev 0x04: msi, AHCI 1.3
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, WDC WD5000LPVX-2, 01.0> SCSI3 0/direct 
fixed naa.50014ee25e479918
sd0: 476940MB, 512 bytes/sector, 976773168 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic 2 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pms0: Elantech Touchpad, version 3, firmware 0x454f00
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
uhub1 at uhub0 port 1 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2
ugen0 at uhub1 port 5 "Lite-On Technology product 0x300b" rev 1.10/0.01 addr 3
uvideo0 at uhub1 port 8 configuration 1 interface 0 "SunplusIT INC. HD WebCam" 
rev 2.00/0.12 addr 4
video0 at uvideo0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 005> SCSI2 0/direct fixed
sd1: 472834MB, 512 bytes/sector, 968365542 sectors
root on sd1a (c6ca7292a1a4bdeb.a) swap on sd1b dump on sd1b
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)


...
I deleted the rest of the "not in sync yet" messages.

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