Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news-1.dfn.de!news.dfn.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Peter Chant Newsgroups: comp.os.linux.hardware Subject: Re: Bad combination of scanner and motherboard? Date: Fri, 03 Jan 2014 21:50:38 +0000 Lines: 43 Message-ID: References: <52c01276$0$300$14726298@news.sunsite.dk> <52c05d4a$0$296$14726298@news.sunsite.dk> <52c0bbdd$0$293$14726298@news.sunsite.dk> <52c58a0a$0$297$14726298@news.sunsite.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Trace: individual.net 8CMSTeHrVw9rWPPEd1/hgw6GFF+M3orVr58Y5fjDtAyanT1fo= X-Orig-Path: phoenix.fire!not-for-mail Cancel-Lock: sha1:Lyuy5sTYKnYcPkWEsWX6MUyjPKE= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 In-Reply-To: <52c58a0a$0$297$14726298@news.sunsite.dk> Xref: csiph.com comp.os.linux.hardware:2169 On 01/02/2014 03:47 PM, Henrik Carlqvist wrote: > On Wed, 01 Jan 2014 22:46:19 +0000, Peter Chant wrote: >> Either way, I've tried a Y cable on the PC to give more power that way - >> to no avail. Did not try it with the hub. Suspect it is a >> firmware/chipset clash somewhere. > > Too bad. I haven't heard of any such clash before, but I have seen some > USB 3 ports being capable of totally hanging the machine when used. > > Sorry that we were not able to solve your problem. > Thank you for your time, it is appreciated. I only posted here when I though I'd exchausted all avenues. > One final test which will not solve your problem: Does the scanner work > when connected to the computer where it has previously worked, but with > the USB hub between the computer and the scanner? > Not tried that. Scanner currently at parents - I'll pick it up soonish as it is doing no good there. > If not, it might instead of a current problem be a voltage problem, but > that problem cannot be solved with a Y-cable. Maybe it would be possible > to solve with another hub or another power supply for the hub. > Hmm. Only have the one powered hub! If it is a voltage issue seems odd to have bad luck with both the PC and the hub. However, trying the hub with a PC that it has worked with might chase down any hub issues. > If the scanner still works on the working computer with the hub connected > it might be a chipset clash as you say, or possibly some software > difference between the machines which has been overlooked. If not firmware perhaps UDEV, it seems not to be giving correct permissions to the device via /dev/bus/???/??? but then root is having no more luck with scanimage -L. I'mm going to look through my bit box to see if I have any spare PCI/usb cards to see if that affects anything. Not sure whether I have any spare or whether new PC as any standard PCI slots!