Date: Wed, 26 Sep 2018 21:50:03 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 231058] no support for active PS/2 multiplexing results in erratic behaviour of Synaptics touchpad on HP 8560w Message-ID: <bug-231058-227-cEk6SXjosq@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-231058-227@https.bugs.freebsd.org/bugzilla/> References: <bug-231058-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D231058 --- Comment #6 from Vladimir Kondratyev <wulf@freebsd.org> --- (In reply to Michael Figiel from comment #3) > I've attached acpi PS2M section from the HP 8560w, it lists two id > strings starting with SYN -- maybe both devices are Synaptics' ? I doubt it. My trackpoint-less HP laptop has exactly the same list of CIDS. > I can't disable single ports ... so I always get data from both devices. You can filter out unwanted data inside read_aux_data_no_wait() routine with dropping read_data() result if previous read_status() invocation has return= ed port number of port that should be disabled. > This amounts to hidden multiplexing -- the data streams of both devices w= ill be interleaved, at the level of three bytes. Fortunately, according to Synaptics docs, driver could be modified to suppo= rt 3bytes packets. Bit6 of 1-st byte is always 0 while bit6 of 4-th byte is al= ways 1. This fact can be used to do a proper assembly of single 6 byte packet f= rom two 3 byte ones. > I think, with this special hardware there are only two viable solutions: 3) Switch touchpad to absolute mode with packetsize reduced to 3 bytes and = use hidden multiplexing. I would like to avoid massive psm.c refactoring as it currently supports only one device at time. > But if you think that's not worth the effort Really I hate 0x46 hack. I spent 2 weekends trying to find a proper initialization way of HP touchpad and did not succeed. :( > If you want any logs/traces I'd be happy to provide them.=20 1. Trackpoint name as it was detected by Linux 2. Short snippets of dmesg or systemlog reflecting both trackpad and trackp= oint touches made with debug.psm.loglevel=3D5 inserted in to /boot/loader.conf I'll make 3-byte packetsize patch to test and will post it here than. Note = I'll be AFK for next two weeks so it can take some time. --=20 You are receiving this mail because: You are the assignee for the bug.=
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