Date: Tue, 23 May 2017 20:55:10 +0200 From: Hans Petter Selasky <hps@selasky.org> To: lev@FreeBSD.org, freebsd-usb@freebsd.org Subject: Re: Ippon Back Power Pro LCD connection flickers Message-ID: <5bd6bfb0-b94c-c5ec-c922-7e04e38dade2@selasky.org> In-Reply-To: <e016ee75-a680-37f3-a84f-f97939265707@FreeBSD.org> References: <1af248e4-50dd-8268-c378-bd5063929310@FreeBSD.org> <ca32090d-4b1d-59bc-7ea2-00836f2aa32d@selasky.org> <2e73775f-1d81-1e09-22fe-4d46c800b157@FreeBSD.org> <3ac65ccf-d75d-df65-df53-a0b6137b54c2@selasky.org> <e016ee75-a680-37f3-a84f-f97939265707@FreeBSD.org>
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On 05/23/17 16:37, Lev Serebryakov wrote: > On 22.05.2017 15:57, Hans Petter Selasky wrote: > >> What is the occurrence rate of this IOERROR? Once per attach/detach. >> >> Did you try to connect the USB device to a different port and/or USB HUB. >> >> It might also be that the user-space driver tries to reset the device >> when it sees this error. To figure that out you'll need to enable >> debugging in the UPS software package. > Hans, as here are some evidences, that Linux doesn't have this problem, > I want to track down it and help you to fix it, if it is fixable on > FreeBSD side (maybe, with some kludge for such devices). > > I know next to nothing about Linux and USB internals, but I'm ready to > test patches, get any dumps, try to boot Linux on this hardware and get > dumps there, etc. Hi, You might try to plug the device to Linux and install the same software package and see what happens. Linux has a tool similar to usbdump, that capture all USB traffic. Maybe this device needs some magic hint to not re-attach all the time. Linux usually have more quirks than we do in FreeBSD. Try searching the internet for the idVendor and idProduct values. --HPS
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