Date: Wed, 30 Jul 2014 21:27:38 -0400 (EDT) From: Benjamin Kaduk <kaduk@MIT.EDU> To: Dutch Ingraham <stoa@gmx.us> Cc: freebsd-hackers@freebsd.org Subject: Re: Audio CDs Not Playing Message-ID: <alpine.GSO.1.10.1407302123080.21571@multics.mit.edu> In-Reply-To: <53D97A50.8090006@gmx.us> References: <53D97A50.8090006@gmx.us>
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I am not sure how helpful this will be, but On Wed, 30 Jul 2014, Dutch Ingraham wrote: > Greetings: > > I asked this question on freebsd-questions a couple of days ago and have > received zero responses, so I'm posting here and asking the hackers for their > help. Here's the problem: > > I'm having trouble with playing audio CDs; specifically, they won't > play at all. Secondarily, it appears as though if they would play, I > would need to be root to do so. > > I am issuing the <cdcontrol -f /dev/cd0 play 1> command and the CD I believe that for this command to actually produce audio playback requires a hardwired connection between the optical drive and the sound card (or motherboard, if it's an integrated sound card as is the norm these days); this is a dedicated 4-pin cable (or so; it's been a while) that's distinct from the power and (P|S)ATA data cable for the drive. That said, I would mostly expect this cdcontrol command to still spin the drive up even if that connection is not in place... > simply will not play (it does not physically spin). However, if I issue > <cdcontrol /dev/cd0 eject>, the CD will eject; if I issue > <cdcontrol /dev/cd0 info>, I will receive the tracks information, etc. > So it appears as though communication is happening, but the CD will not > play. If I issue these commands as a regular user, I receive a > "permission denied" message; if run as root, simply nothing happens - > no error, nothing. In fact, issuing <echo $?> returns 0. > > PS - This issue is not limited to CLI commands; VLC will issue the > error "VLC is unable to open the MRL 'cdda:///dev/cd0'. Check the > log for details." There is no log info that I can find. In addition, I > can burn a cd with xfburn, but only as root. My fstab has the standard entry > for CDs. Sound does work, as I can generate white noise. It does not seem very surprising to me that root privilege is required to (e.g.) burn a CD. This is related to at least the permissions on on the /dev/cd0 device node, which I don't think were in the context I trimmed... -Ben
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