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—slackware:fixes [2006/09/29 19:58] – Create a FAT32 partition. alien
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 +===== Fixes for annoyances in Slackware =====
  
 +==== USB scanner and hotplug ====
 +
 +When you have a USB scanner attached to your computer when it boots, and the computer uses //hotplug// to initialize your hardware, you will probably see something similar to the following message: <code>
 +chown: cannot access `/proc/bus/usb/001/005': No such file or directory
 +chmod: cannot access `/proc/bus/usb/001/005': No such file or directory
 +</code> When you plug in your USB scanner //after// the computer has already booted up, the error does not appear and scanning works for non-root users. It is annoying to have to unplug the scanner before booting in order to be able to scan as a non-root user. Here's a fix.
 +
 +The problem is due to an error in the ''/etc/hotplug/usb.rc'' script, but that can be repaired easily. Look for the following line in  ''/etc/hotplug/usb.rc'' <code>
 +devbus=$( ( echo -n 000 ; cat $devlink/../../devnum ) | grep -o ...\$ )
 +</code> and change that line to <code>
 +devbus=$( ( echo -n 000`echo $devlink| sed 's/^.*usb\([0-9]\+\)\/.*$/\1/'` ) | grep -o ...\$ )
 +</code>
 +After this change, either reboot the computer or restart hotplug: <code>/etc/rc.d/rc.hotplug restart
 +</code> Now, the correct permissions and ownership are applied to the device file.
 +<note tip> Remember to add yourself to the ''scanner'' group if you want to use your scanner as a non-root user! You can use the ''vigr'' command to add your name to the ''scanner'' group, but if you're uncomfortable with directly editing the system files, here is a one-liner to add user 'geek' to group 'scanner' (replace 'geek' with your own account name): <code>
 +usermod -G $(id -Gn geek | tr ' ' ','),scanner geek
 +</code> If the group scanner does not exist, simply create it using the command <code>groupadd scanner</code>
 +</note>
 +
 +----------------
 +
 +==== ALSA OSS sequencer not loaded ====
 +
 +In Slackware 10.2, the ALSA OSS-compatible sequencer module is not loaded. This results in missing device files ''/dev/midi'' and ''/dev/sequencer''.\\
 +Edit the file ''/etc/rc.d/rc.alsa'' and look for the function <code>
 +load_alsa_oss_modules() {
 +  if ! cat /proc/modules | grep -wq snd-pcm-oss ; then
 +    if ! cat /proc/modules | grep -wq snd_pcm_oss ; then
 +      echo "Loading OSS compatibility modules for ALSA."
 +      modprobe snd-pcm-oss
 +      modprobe snd-mixer-oss
 +}</code> Add the following line after the line ''modprobe snd-mixer-oss'' in that function: <code>
 +      modprobe snd-seq-oss
 +</code> and restart ALSA.
 +
 +----------------
 +
 +==== Using Samba without installing CUPS ====
 +
 +In Slackware, CUPS is available as the default printing solution, while the old lprNG remains in the "''/pasture''" directory. Some people still prefer the trusted lpr/lpd style of printing and do not install CUPS. However, the Samba package is compiled against the CUPS libraries. Although the necessary CUPS libraries are always installed with the //aaa_elflibs// package, Samba still periodically complains loudly in the ''/var/log/messages'' logfile about the absent CUPS server: <file>
 +smbd[....]: Unable to connect to CUPS server localhost - Connection refused
 +</file>
 +The solution (if you don't need a printing facility in Samba) is to disable printing completely. This is what you need to add to the **''[Global]''** section of your ''/etc/samba/smb.conf'' file: <code>
 +load printers = no
 +printing = bsd
 +printcap name = /dev/null
 +</code>
 +
 +----------------
 +
 +==== Where is mkfs.vfat? ====
 +
 +FAT32 (also known as vfat) partitions are commonly used on USB sticks, and they are also quite useful when you have a dual-boot system with Windows on a NTFS partition on the "other side", and want a shared partition where both OS-es can write files.\\
 +Now, where did that "''mkfs.vfat''" command go, that seems to be available on so many other Linux distributions and is mentioned in lots of Google search results when you try to find out how to format your partition as FAT32 instead of FAT16?
 +
 +The ''mkdosfs'' command aka the ''mkfs.msdos'' command (they're the same command, one is symlinked to the other) which by default creates FAT16 ("//DOS//") partitions, can create these FAT32 partitions as well!\\ Run it with the **''-F32''** switch: <code>
 +mkfs.msdos -F32 /dev/<devicename>
 +</code>

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Fixes for annoyances in Slackware ()
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