Tejun, while my situation resembles that of Nick below, there seem still to be some unexplained observations remaining. See below. 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
