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kernel_messages [2018/04/09 02:20] beandog created |
kernel_messages [2018/04/09 02:22] beandog |
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Apr 9 02:19:36 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552 | Apr 9 02:19:36 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552 | ||
Apr 9 02:19:36 tux kernel: Buffer I/O error on dev sr0, logical block 1610944, async page read | Apr 9 02:19:36 tux kernel: Buffer I/O error on dev sr0, logical block 1610944, async page read | ||
+ | </code> | ||
+ | |||
+ | When you put a disc in the drive, there's a [[udev]] rule that runs [[cdrom_id]] to get the device variables (which is an ingenious program, I might add). | ||
+ | |||
+ | You can see what udev is doing at ''/lib64/udev/rules.d/60-cdrom_id.rules'' | ||
+ | |||
+ | It's tiny and mostly self-explanatory, so I'll post the whole thing here: | ||
+ | |||
+ | <code> | ||
+ | # do not edit this file, it will be overwritten on update | ||
+ | |||
+ | ACTION=="remove", GOTO="cdrom_end" | ||
+ | SUBSYSTEM!="block", GOTO="cdrom_end" | ||
+ | KERNEL!="sr[0-9]*|xvd*", GOTO="cdrom_end" | ||
+ | ENV{DEVTYPE}!="disk", GOTO="cdrom_end" | ||
+ | |||
+ | # unconditionally tag device as CDROM | ||
+ | KERNEL=="sr[0-9]*", ENV{ID_CDROM}="1" | ||
+ | |||
+ | # media eject button pressed | ||
+ | ENV{DISK_EJECT_REQUEST}=="?*", RUN+="cdrom_id --eject-media $devnode", GOTO="cdrom_end" | ||
+ | |||
+ | # import device and media properties and lock tray to | ||
+ | # enable the receiving of media eject button events | ||
+ | IMPORT{program}="cdrom_id --lock-media $devnode" | ||
+ | |||
+ | # ejecting a CD does not remove the device node, so mark the systemd device | ||
+ | # unit as inactive while there is no medium; this automatically cleans up of | ||
+ | # stale mounts after ejecting | ||
+ | ENV{DISK_MEDIA_CHANGE}=="?*", ENV{ID_CDROM_MEDIA}!="?*", ENV{SYSTEMD_READY}="0" | ||
+ | |||
+ | KERNEL=="sr0", SYMLINK+="cdrom", OPTIONS+="link_priority=-100" | ||
+ | |||
+ | LABEL="cdrom_end" | ||
</code> | </code> |