On Sun, Oct 05, 2008 at 05:41:09PM +0800, D Bray wrote: > > Tejun, > > while my situation resembles that of Nick below, there seem still to > be some unexplained observations remaining. See below. For the record, I have to give an update for this issue which arose for me back in September. In brief: The application-level symptom (ie failing to play some CDs/DVDs) has failed to reproduce! Though the issue outlined below was at the driver level, and I have no evidence questioning its validity, one may wish to take the new observation into account. More details: A while ago, I happened to boot into the "debian security update" kernel mentioned below, and all was well! IOW, the audio/video problems, occuring back in Sep. 2008, no longer occured on the same box. I did not have time to carefully re-examine this, and cannot explain the contradiction. As, to my knowledge, no-one else has corroborated the alleged misbehaviour on this kernel, then I have had to question my original post of 29 Sep 2008 on debian-user. However, I see no reason to do the same for the driver-level issue outlined below (regarding the capabilities query between the driver and the CD/DVD device.) Never the less, I thought that I ought to update everyone. Regards, DB > > On Sun, Oct 05, 2008 at 12:09:15PM +0900, Tejun Heo wrote: > > (cc'ing linux-ide) > > > > Nick Warne wrote: > > > Hi all, > > > > > > Very strange issue. I recently bought a new machine that came with a > > > CD/DVD burner. All functions normally, except I cannot play audio CD. > > > > > > Information: > > > > > > Slackware 12.1 running latest stable kernel 2.6.26.5 > > > > > > The drive is: > > > > > > Vendor : Optiarc > > > Model : DVD RW AD-7200A > > > Revision : 1.06 > > > > > > Now, I have another drive (I purchased last year) that could play audio > > > CD, so I installed that as master, and put the new drive as slave > > > (old->hda new->hdb). The old(er) drive can and does play audio OK. > > > > > > I see this in /proc/sys/dev/cdrom/info: > > > > > > drive name: hdb hda > > > drive speed: 48 48 > > > drive # of slots: 1 1 > > > Can close tray: 1 1 > > > Can open tray: 1 1 > > > Can lock tray: 1 1 > > > Can change speed: 1 1 > > > Can select disk: 0 0 > > > Can read multisession: 1 1 > > > Can read MCN: 1 1 > > > Reports media changed: 1 1 > > > Can play audio: 0 1 > > > Can write CD-R: 1 1 > > > Can write CD-RW: 1 1 > > > Can read DVD: 1 1 > > > Can write DVD-R: 1 1 > > > Can write DVD-RAM: 1 1 > > > Can read MRW: 1 1 > > > Can write MRW: 1 1 > > > Can write RAM: 1 1 > > > > > > log/messages: > > > Oct 4 09:27:01 sauron kernel: hda: UDMA/66 mode selected > > > Oct 4 09:27:01 sauron kernel: hdb: UDMA/66 mode selected > > > Oct 4 09:27:01 sauron kernel: hda: ATAPI 48X DVD-ROM DVD-R-RAM CD-R/RW > > > drive, 2048kB Cache > > > Oct 4 09:27:01 sauron kernel: Uniform CD-ROM > > > driver Revision: 3.20 > > > Oct 4 09:27:01 sauron kernel: hdb: ATAPI 48X > > > DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache > > > > > > /log/syslog > > > Oct 4 09:27:01 sauron kernel: hda: TSSTcorp CDDVDW SH-S202J, ATAPI > > > CD/DVD-ROM drive > > > Oct 4 09:27:01 sauron kernel: hdb: Optiarc DVD RW > > > AD-7200A, ATAPI CD/DVD-ROM drive > > > > > > > > > I have investigated this, but can't find any information at all - there > > > are very few hits doing a search, but relevant pages I found are: > > > > > > D. Bray filled a very verbose bug report of a similar issue: > > > http://lists.debian.org/debian-user/2008/09/msg01696.html > > I'll summarise its pertinent crux here. In short, a year-old CD/DVD > drive used to play audio CDs as well as encrypted DVDs. A small > upgrade was performed on the box (including a kernel change), and then > these functions failed. The rest of the drive's functionality remained > unaffected. Subsequently, another (ie third) kernel was installed, and > the drive's full functionality was restored. > Furthermore, the drive appears to report different capabilities to > the different kernels: > > 1. The debian Etch kernel (linux-image-2.6.18-5-686 2.6.18.dfsg.1-13) > played audio CDROMs and encrypted DVDs. (I do not have its > /proc/sys/dev/cdrom/info output.); > > 2. The debian security update to this kernel > (linux-image-2.6.18-5-686_2.6.18.dfsg.1-13etch6_i386.deb) did not play > audio CDROMs or encrypted DVDs, and reported no-audio in > /proc/sys/dev/cdrom/info; > > 3. 2.6.26.5, built locally to match the 2.6.18-5 configuration, plays > audio CDs & encrypted DVDs, and reports with-audio in /proc. > > As my post to the debian-user list shows, numerous other possibilities > were explored before the kernel was focused on -- and even then, it > was focused on as a work-around, not necessarily as a culprit. > > > > > > > > A Gentoo user with the same drive reports another issue, but his CDROM > > > info dump also reports this model cannot play audio CDs: > > > http://bugs.gentoo.org/show_bug.cgi?id=218413 > > > > > > A Ubuntu user with the same drive also rpeorts audio CDs cannot be > > > played: > > > http://ubuntuforums.org/showthread.php?t=675812 > > > > > > > > > Myself and D. Bray had a discussion on this, and we both feel this > > > could be a kernel issue. > > Nick believes his situation to have been different -- and it was > resolved by a patch from Bodo Eggert which had the ide-cd driver > ignore Nick's drive's misbehaviour. The latter is reported to have > been due to its firmware's poor implementation. (I & Nick use > different drives.) > > But this leaves my situation in which the same drive appears to be > reporting different capabilities to different kernels. > > Also, another symptom in my case was that unencrypted DVDs would play > (even with "Can read DVD: 0"), but not encrypted ones. > > It seems to me that there is something going awry in the capabilities > query between the driver and the device, whether caused by the > device's f/w or by the driver. However, if someone has a dismissive > explanation of the above, I'll still be happy! :-) > > Thanks everyone. > > regards, > DB > > > > > > > > > > > > > I would be able to debug this issue if required. > > > > Can you try libata driver and see whether anything is different? > > > > -- > > tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
