[SOLVED] Changing USB device option in /sys at boot

'Sup!
I'm using a Macbook Pro and I would like to have my function keys default to F1-F12 rather than the media buttons. This can be done using
echo 2 > /sys/module/hid_apple/parameters/fnmode
However, I would like to find a neat and tidy way to do this on boot, and systemd's docs are generally not that well written. What can I do?
Last edited by oboenerd (2013-04-11 11:13:44)

"modinfo hid_apple" tells me that the module has a parameter for this, so this should be the best approach:
# /etc/modprobe.d/hid_apple.conf
options hid_apple fnmode=2

Similar Messages

Can i change usb device driver from windows 7 format to mac format?

i bought an pcdvb xvision 3100.it has drivers for windows 7 .i have a macbook pro with mountain lion.how can i use this usb device on mac .please explain which app can do this to convert this driver or how with other ways?

A Google search turned up this device as only being sold in Arabic countries - I can't tell for sure what it is: a stereo receiver? You're just going to have to check with the manufacturer to see if there is OS X support for the device.
Clinton

USB Devices not working on cold boot

On a cold boot, I get either my mouse (Microsoft Optical) or my modem (see signature) not switched on. If I reboot, or just re-plug them in, they switch on and Windows detects them. The modem is attached to a port on the mobo, and the mouse to a powered USB hub. The only other device powered at boot is a joypad (Thrustmaster Dual Power 2), which always works at boot. Devices switched off at boot are a printer/scanner, desktop light, and an extension lead for a thumb drive.
Does anyone have a solution to this?

Quote from: artur.aragao on 13-February-05, 11:59:04
Expensive friend,
Step for the same problems, where already I communicated diverse times with the support of the MSI not obtaining a definitive solution for this problem. It does not go to advance nor to make magic, therefore the problem has left of the plate-mother and not of the operational system. I have one mouse of the Microsoft who possesss led and when I give the departure in the PC the same does not light in the screen of informs of devices of the CMOS. It would have.
Then I am obliged to remove and to place mouse of the door usb so that mouse functions. The problem is that I have that to faer this almost all time that I bind the micron.
The bios beta that decided this problem palliative were 1.5B8.
I see that all the ones that pass for this problem are receiving the had respect, therefore this problem already is old and no solution was adopted until the moment for the manufacturer.
If my problem to continue, I will get rid myself of my plate and I will migrarei for another manufacturer who hears me and she respects me, therefore we make many times investment s in products that would not have to give as much migraine.
We buy TVs and DVDs and we do not pass for problems as these.
I was disappointed with the MSI in this part. It would go to acquire a VGA 6600GT, but today I think seriously about not buying more nothing of the MSI.
Still more for that it occurred with the 6800GT that were being sales and in the truth they were 6800NU.What it is this?
I advise to the friend who if not to decide its problem in at least 1 month, it speaks brazenly of its mainboard and it buys of another
manufacturer as the ABIT or same Gibagyte.
I have friends that they possess plates of the Gigabyte and are very happy.
Artur de Souza Aragão
HUH??? You did know this is an English languager board right? If not then please read the forum rules. Also note that hijacking someone else's post so you can complain is against the rules here as well.
This is entirely a user to user forum and as such MSI is not here nor do they read it. So yopur complaints whatever they may be as we can't entirely read your post is not getting to those folks that you want to complain at. Instead you are just making the rest of us upset for no visable reason. If you want to contact MSI to copmplain may I suggest a phone call. You may also want to call someone there that actually speaks the same language so there are no miscommunications as what is happening here.
Edit - his posts on this subject were all removed due to spamming the forum.

Suspending USB Device [SOLVED]

I had 2.6.32 a while ago and wrote a script that allowed me to turn a certian usb device on and off (I used my usb mouse as a demo). When I upgraded to 2.6.33, the way I was doing this stopped working. I was using this (with $port being something like "4-1;" I determine the port by looking at the "product" files in all of the directories in /sys/bus/usb/devices/):
echo suspend > /sys/bus/usb/devices/$port/power/level
echo-ing "on" works fine on both 32 and 33, but when I echo "suspend" (or anything else... like "cows are awesome") on 33 it returns:
bash: echo: write error: Invalid argument
Is there any documentation somewhere that will tell me what the valid values are? I have searched around and haven't been able to find any docs. I have found a few people talking about it, but nowhere have I found a list of valid stuff. I don't exactly want to try browsing through the kernel source code trying to find it... but I guess that is always a last resort.
Edit: On http://www.mjmwired.net/kernel/Document … nt.txt#125 it said:
(In kernels up to 2.6.32, you could also specify "suspend", meaning that the device should remain suspended and autoresume was not allowed. This setting is no longer supported.)
How am I supposed to manually suspend a usb device?
Solution:
echo "0" > "/sys/bus/usb/devices/$port/power/autosuspend"
echo "auto" > "/sys/bus/usb/devices/$port/power/level"
Garrett
Last edited by Floft (2010-04-20 00:10:20)

... turns out my usb mouse caused the problem. Unplugged it and the connection issues are gone.

Windows XP does not recognise USB devices after installing itunes 7.2

After downloading itunes 7.2 my PC no longer recognises my ipod nano (2G, 2Gig). Uninstalling itunes 7.2 and reverting to a previous version makes no difference.
On top of this my PC no longer recognises my external USB 2.0 HDD.
Uninstalling and allowing windows to rediscover USB devices \ hubs etc as per MS recomendations has not resolved my problem
Both devices function with no issues when plugged into my laptop.
Any suggestions on how to resolve this will be greatly received!
Many thanks
Justdoit2.

Power down and wait... does not solve the "USB Device Not Recognized" problem in my desktop running XP Professional.
All five USB Root Hubs are stucked. I tried uninstalled them all and let XP to find new devices but afterwards the problem still remains.
By the way, I have a thousand songs stored in the iPod Nano (2nd generation). Will iPod reset erase all my songs?
iPod Nano 8GB Windows XP Pro

MSI P43 won't boot with usb devices connected

My system:
MSI P43 Neo
Intel Core 2 Duo E8400
NorthQ Black Magic 850 watt PSU
Corsair 4 x 2GB ram PC2-8500 1066MHz
Seagate 320 GB hd
Hitachi 1 TB hd
Samsung 1.5 TB hd
Club3D Nvidia GTX275 1,75 GB
Samsung DVD Write Master
When i try to boot i freezes at the detecting usb devices when i have a usb device connected. It does with any usb device. But when i boot up without any usb devices connected then i boot fine and i can connect the devices right after the detection of usb devices. How can that be?

Googled on "computer not booting with usb code 6b38" and found this:
Quote
****SLOW BOOT-UP in POST SCREEN****
P.S. If you see the BIOS code 6B38 in the bottom right corner of the screen, this is a indication that USB Legancy support is enabled in the BIOS. If this is enabled and you have any usb devices attached such as a external USB Hard drive, your system will take ages to go through the POST boot screens.
So disable this setting in the BIOS and the system will then boot in a matter of Seconds
From:
http://www.rebelshavenforum.com/sis-bin/ultimatebb.cgi?ubb=get_topic;f=30;t=000250
Also try and see if a clear CMOS will help, some people suggested that from a old post from MSI forum here, saying its bios 1.3 thats bugged.
So if disabling doesnt work, perhaps down/upgrading BIOS might.

[SOLVED] setting up permissions for mounted usb devices

Hi all,
I've been having the following problem when mounting my external hd: in order to mount the external hd I created a folder /mnt/usbstick/ giving permissions to a non-root user to read the files/directories in this folder (using chmod); however, after I mount the external hd, the set of permissions for /mnt/usbstick/ change so that a non-root user cannot read the mounted files in /mnt/usbstick. This is a problem for me because, when I copy a file from the external hd to the non-root home folder, the copied file can only be read by the root user.
Do you know how I can solve this problem? Should I write a udev rule and place it at /etc/udev/rules.d/? Or should I simply add the non-root user to a specific group from /etc/group? Any ideas?
Thanks!
Last edited by falsum (2010-05-08 09:21:59)

You could try adding an entry for your usb device in /etc/fstab and specify the option user to let non-superusers mount it.
Here's an example of an entry for my external HD. I'm sure there are probably other (and better) ways to do this but it works for me.
UUID=4376-0BFB /media/FIRELITE vfat rw,user,noauto,async 0 0
Nice howto found on the wiki: http://wiki.archlinux.org/index.php/Fstab

[SOLVED] USB Devices No Longer Designated by UUID

My USB devices (external disks, flashdrives, etc) have always been mounted using their UUID. I have grsync processes set up using this method which I have used for years. Suddenly, my devices are being shown by label (/dev/sdb1, etc), and now no processes using the UUIDs will work without being changed to use the label.
As far as I know, I haven't done anything, so I guess an update has caused this, but I have no idea exactly when it happened, or how to get back to UUID identifiers.
I would be very grateful for any advice on how to begin to resolve this.
Many thanks in advance.
Last edited by myrlin (2012-07-04 08:40:50)

Berbae, your post gave me a clue where to start, and I have now identified the problem.
I am using Openbox, and had added "spacefm -desktop" to the autostart folder in order to manage wallpaper, etc. This resulted in it running in the background, and the mounting application it uses by default (pmount?) is not showing UUIDs. I removed this from the autostart folder, and everything was back to normal, so it's a spacefm issue which I need to resolve.
Although I haven't fully fixed the problem yet, I know where it lies, so I am marking this as "solved"
Once again, thank you providing me with a starting point.

One of the usb devices attached to this computer has malfunctioned, and Windows does not recognize it. For assistance in solving this problem, click this message.

I connected my sons Ipod Touch to my pc and it worked fine. Now, when I try to connect my iPad the following message comes up: One of the usb devices attached to this computer has malfunctioned, and Windows does not recognize it. For assistance in solving this problem, click this message.
I checked the cable. It surely is not the cable. If I connect the iPod again it works fine. If I use the same cable with my pc and ipad at work or my other son’s laptop, it is working perfectly. It is only on my laptop where the iPod was connected. Something tells me it got something to do with the drivers that went corrupt or something when I connected the iPod.
I searched the internet and I see a lot of people gets this message. Still no solved answers yet. Is there a place where I can download the drivers again or any other suggestions?
Windows 7 and iPad 2
Kind regards,

I was hoping it would be something like a USB device conflict, but now the shuffle is the only thing connected...
This article was one of the ones you linked to above in your initial post
http://support.apple.com/kb/TS1369
Under Part 9. Verify that USB drivers are installed, did you try the steps in If only "Unknown Device" appears? That appears to be your situation.
Also, you said that the shuffle initially worked well enough to do a sync, then it had the same problem again. If you can get it to work again initially, before doing anything else, try the following. Select the shuffle in the iTunes sidebar, under DEVICES. Over to the right, go to the Summary tab. By default, the checkbox for Enable disk use should be unchecked. If so, check it and Apply the change. See if that makes any difference.
(If Enable disk use was already checked, try unchecking it and Apply the change. Basically, set it the "other way" and see if there is any improvement.)
NOTE: When disk use is enabled, you have to eject the iPod in iTunes before disconnecting it physically.
If the disk use change makes a difference, that may provide a clue about the actual cause.

Using iPod shuffle 4th generation for first time and receiving the error : one of the USB devices attached to this computer has malfunctioned, and windows does not recognize it. For assistance in solving this problem, click this message

Using iPod shuffle 4th generation for first time and receiving the error : one of the USB devices attached to this computer has malfunctioned, and windows does not recognize it. For assistance in solving this problem, click this message.
Using win 7 and latest iTunes [10.6.3]. Have already gone through below links and did not find any solution.
http://support.apple.com/kb/HT2292
http://support.apple.com/kb/TS1369
http://support.apple.com/kb/HT1923
http://en.kioskea.net/forum/affich-17997-ipod-not-detected

I was hoping it would be something like a USB device conflict, but now the shuffle is the only thing connected...
This article was one of the ones you linked to above in your initial post
http://support.apple.com/kb/TS1369
Under Part 9. Verify that USB drivers are installed, did you try the steps in If only "Unknown Device" appears? That appears to be your situation.
Also, you said that the shuffle initially worked well enough to do a sync, then it had the same problem again. If you can get it to work again initially, before doing anything else, try the following. Select the shuffle in the iTunes sidebar, under DEVICES. Over to the right, go to the Summary tab. By default, the checkbox for Enable disk use should be unchecked. If so, check it and Apply the change. See if that makes any difference.
(If Enable disk use was already checked, try unchecking it and Apply the change. Basically, set it the "other way" and see if there is any improvement.)
NOTE: When disk use is enabled, you have to eject the iPod in iTunes before disconnecting it physically.
If the disk use change makes a difference, that may provide a clue about the actual cause.

How can I boot to USB device if no USB boot option in BIOS

I just purchased a Toshiba NB305-N410BL but am concerned as to how I would image the 250GB HDD if I can not boot from an external cdrom drive. I tried to backup to shared network folder but none show up on list. Only boot options in BIOS are HDD, FDD, and LAN. Thanks for all help in advance.

Hi, buddy-erp.
I don't know if my instructions apply to you because I only have the NB305 model. However, if you say you have followed all instructions, that is, 1) insured that no other USB devices are connected to your computer at bootup time and 2) have pressed F12 to enter the boot menu; 3) and then designated the USB flash drive as the source of the bootable restoration software you may need Toshiba technical support. I wonder if there is a BIOS update for your computer too. This may need to be downloaded and installed prior to beginning the restoration process. Nevertheless, as stated, I have a NB305 model and the instructions are clear. FYI (for your information), a virus infected my system and made certain changes to this process. Toshiba technical support informed me that the information displayed was wrong and the process outlined was unnecessary but did require technical support to restore it to the OEM default options.
Good luck.
Sincerely,
Bi-Ill
Good luck!
Sincerely,
Bill5960

[SOLVED]My udev rules don't automount usb device

Hi,
I'm using this .rules file for automounting usb devices:
# start at sdc to ignore the system hard drive
KERNEL!="sd[c-z]*", GOTO="my_media_automount_end" #sda and sdb are internal hard drives
ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="my_media_automount_end"
# import some useful filesystem info as variables
IMPORT{program}="/sbin/blkid -o udev -p %N"
# get the label if present, otherwise assign one based on device/partition
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"
ENV{ID_FS_LABEL}=="", ENV{dir_name}="%k"
# create the dir in /media and symlink it to /mnt
ACTION=="add", RUN+="/bin/mkdir -p '/media/%E{dir_name}'"
# global mount options
ACTION=="add", ENV{mount_options}="relatime"
# filesystem-specific mount options (777/666 dir/file perms for ntfs/vfat)
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs", ENV{mount_options}="$env{mount_options},gid=100,dmask=000,fmask=111,utf8"
# automount ntfs filesystems using ntfs-3g driver
ACTION=="add", ENV{ID_FS_TYPE}=="ntfs", RUN+="/bin/mount -t ntfs-3g -o %E{mount_options} /dev/%k '/media/%E{dir_name}'"
# automount all other filesystems
ACTION=="add", ENV{ID_FS_TYPE}!="ntfs", RUN+="/bin/mount -t auto -o %E{mount_options} /dev/%k '/media/%E{dir_name}'"
# clean up after device removal
ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/umount -l '/media/%E{dir_name}'", RUN+="/bin/rmdir '/media/%E{dir_name}'"
# exit
LABEL="my_media_automount_end"
The folders in /media are created successfully but no mounting takes place. The folders are empty and when I do
umount /media/device
, it returns:
umount: device/: not mounted
But when I try to remove the folder, it sometimes returns:
rmdir: failed to remove 'device/': Device or resource busy
When I unplug the device, the folders are deleted successfully.
When I manually mount the device with the code for ntfs from the rules-file, it works fine. I have also verified that the device is at /dev/sdc.
Through searching I didn't find any post with a problem like that. My guess was that somehow this test fails:
ACTION=="add", ENV{ID_FS_TYPE}=="ntfs"
I already tried removing the second condition, but the result stays the same. So I am left rather clueless, I hope, you guys can help me
Last edited by toffi-fee (2014-05-04 22:47:38)

Thanks for the reply! So now I changed the rules to:
KERNEL!="sd[c-z]*", GOTO="my_media_automount_end"
ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="my_media_automount_end"
# import some useful filesystem info as variables
IMPORT{program}="/sbin/blkid -o udev -p %N"
ACTION=="add", RUN+="/bin/udisksctl mount -b /dev/%k"
# clean up after device removal
ACTION=="remove", RUN+="/bin/udisksctl unmount -b '/dev/%k'"
# exit
LABEL="my_media_automount_end"
But now nothing seems to happen when I plug in, also no folder creation at /run/media/user/, hmmm..
Last edited by toffi-fee (2014-05-04 19:27:53)

USB device (Logitech QuickCam Messenger) stopped working (SOLVED)

Hey there,
I have a logitech quickcam messenger, which used to work perfectly 2 days ago. I updated my system yesterday and this morning, but I tried the cam again only now, and neither cheese nor webcamstudio work anymore (it never worked in skype since I moved from Mint to Arch a few weeks ago, but that was easily (and better) addressed by starting cheese and then using desktop sharing in Skype)
The webcam is recognized
sammy@Cosmic-Bandito ~$ lsusb
Bus 001 Device 007: ID 046d:08da Logitech, Inc. QuickCam Messanger
Bus 001 Device 006: ID 056a:00d4 Wacom Co., Ltd
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB [Hama]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 003: ID 046d:c513 Logitech, Inc. MX3000 Cordless Desktop Receiver
Bus 002 Device 002: ID 046d:c51a Logitech, Inc. MX Revolution/G7 Cordless Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
/dev/video and /dev/video0 are created.
cheese only shows a black window and spits out :
sammy@Cosmic-Bandito ~/Videos/Webcam$ cheese
libv4l2: error turning on stream: Input/output error
webcamstudio hangs when I try to start the preview and its output is :
libv4l2: error turning on stream: Input/output error
USB Camera (046d:08da) Error: BaseSrc: [v4l2src0],5, Error starting streaming on device '/dev/video0'.
EDIT: that's the output of dmesg when I reconnect the webcam (after having disconnected it obviously) :
[ 2216.282753] hub 1-1:1.0: state 7 ports 4 chg 0000 evt 0010
[ 2216.283231] hub 1-1:1.0: port 4, status 0101, change 0001, 12 Mb/s
[ 2216.387861] hub 1-1:1.0: debounce: port 4: total 100ms stable 100ms status 0x101
[ 2216.450867] usb 1-1.4: new full speed USB device using ehci_hcd and address 11
[ 2216.462234] hub 1-1:1.0: port 4 not reset yet, waiting 10ms
[ 2216.537006] usb 1-1.4: ep0 maxpacket = 8
[ 2216.538992] usb 1-1.4: skipped 4 descriptors after interface
[ 2216.538994] usb 1-1.4: skipped 2 descriptors after interface
[ 2216.538996] usb 1-1.4: skipped 1 descriptor after endpoint
[ 2216.538998] usb 1-1.4: skipped 2 descriptors after interface
[ 2216.539000] usb 1-1.4: skipped 1 descriptor after endpoint
[ 2216.539006] usb 1-1.4: udev 11, busnum 1, minor = 10
[ 2216.539008] usb 1-1.4: New USB device found, idVendor=046d, idProduct=08da
[ 2216.539010] usb 1-1.4: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2216.539081] usb 1-1.4: usb_probe_device
[ 2216.539084] usb 1-1.4: configuration #1 chosen from 1 choice
[ 2216.539364] usb 1-1.4: adding 1-1.4:1.0 (config #1, interface 0)
[ 2216.539400] zc3xx 1-1.4:1.0: usb_probe_interface
[ 2216.539402] zc3xx 1-1.4:1.0: usb_probe_interface - got id
[ 2216.539404] gspca: probing 046d:08da
[ 2217.384009] zc3xx: probe 2wr ov vga 0x0000
[ 2217.407008] zc3xx: probe sensor -> 0011
[ 2217.407010] zc3xx: Find Sensor HV7131R(c)
[ 2217.407304] input: zc3xx as /devices/pci0000:00/0000:00:0b.1/usb1/1-1/1-1.4/input/input14
[ 2217.407372] gspca: video0 created
[ 2217.407374] gspca: found int in endpoint: 0x82, buffer_len=8, interval=10
[ 2217.407381] usb 1-1.4: link qh8-0601/f6f9e240 start 5 [1/2 us]
[ 2217.407401] usb 1-1.4: adding 1-1.4:1.1 (config #1, interface 1)
[ 2217.407438] zc3xx 1-1.4:1.1: usb_probe_interface
[ 2217.407441] zc3xx 1-1.4:1.1: usb_probe_interface - got id
[ 2217.407443] gspca: probing 046d:08da
[ 2217.407455] snd-usb-audio 1-1.4:1.1: usb_probe_interface
[ 2217.407458] snd-usb-audio 1-1.4:1.1: usb_probe_interface - got id
[ 2217.410813] usb 1-1.4: adding 1-1.4:1.2 (config #1, interface 2)
[ 2217.410855] drivers/usb/core/inode.c: creating file '011'
EDIT 2: Just tried the webcam on another computer, and it works there. so it's not the hardware
any ideas? I'm pretty desperate, as this is the only way for me to keep in touch with my kids at the moment
Last edited by SammyF (2010-05-28 20:44:15)

SOLVED : really stupid problem, but well... I'll completement my post and leave it for anybody who might hit the same problem :
dmesg looked like this when after I started cheese :
[ 3815.848011] usb 1-1.4: unlink qh8-3008/ec236980 start 0 [1/2 us]
[ 3815.848995] gspca: found int in endpoint: 0x82, buffer_len=8, interval=10
[ 3815.849001] usb 1-1.4: link qh8-0601/f6848ec0 start 1 [1/2 us]
[ 3816.696230] zc3xx: probe 2wr ov vga 0x0000
[ 3816.917369] ehci_hcd 0000:00:0b.1: iso sched full f0049c00 (now 652 max 2700)
[ 3816.917377] gspca: bandwidth not wide enough - trying again
[ 3816.938010] gspca: no transfer endpoint found
The (not so obvious) solution was to connect the webcam directly to the computer and not through a USB hub. I have no idea why it used to work and suddenly stopped, but it works again now.
sorry to take up your time, in case I did.
Last edited by SammyF (2010-05-28 20:44:56)

[Solved]Automating a script for a usb device on systemd?

Solution:See 3rd post by 65kid.
Ok I'm trying to learn how to automate the execution of a script I wrote to run whenever a specific usb device is plugged in. In this case a usb flash drive with a specific partition identified though UUID following the path /dev/disk/by-uuid/specified-partion's-uuid.
Basically the script uses rsync to update a snapshot of my system which I made bootable on this device. following the guide given in the wiki on full system backup using rsync I edited the --exclude options to ignore the contents of my /boot/ /etc/fstab and /etc/mkinitcpio.conf since the fstab entries, hooks array and initramfs and kernel images generated with them needed to be changed so as to make this snapshot bootable and adapted for use on the usb stick.
the ultimate goal is to have a bootable snapshot the can be updated with whatever changes have been made with my system(i.e. pacman -Syu updates,config changes etc...) while leaving out the important things needed to have the usb still bootable afterwards. I've already succeeded at getting the script to work but I have to mount it manually then execute the script myself and I know that it works afterwards as I can still boot from the stick afterwards.
This is not a question about rsync (which is why the script isn't posted here), to repeat myself, It's about how to execute ANY custom script whenever a specific device is plugged in. More specifically when a storage device with a certain uuid is detected after the device has been plugged in. I believe it may be different for running pure systemd and so that was the reasoning for having it mentioned in the subjects title(if I'm wrong then correct my understanding). If anything a few pointers on where to look would be appreciated. I've been googling and reading the wiki a bit with nothing specific on how to approach this. If an example of the script is requested I'll post it but it's not relevent to my question.
For a general veiw of my setup regarding external storage volumes I do not automount anything as I do not use all the things I plug in in the same manner. Some of the stuff I do requires them to be unmounted or mounted to different mount points(specified by me). The script handles the mounting part by itself just fine. The idea I have is to run it automatically when the flash drive is present. Any suggestions?
Last edited by Thme (2012-12-29 00:06:56)

Awebb wrote:You "seem to remember" has FUD potential, could you care to find the post again?
he is probably referring to this: https://bbs.archlinux.org/viewtopic.php … 2#p1113682
imho this is way different, the SYSTEMD_WANTS tag is completely ok to use. yes, he may be mounting the drive from the script, but imho he is not "exploiting" anything here. I personally don't see a much more elegant way to do this.
these automount udev rules were however crappy and hackish. They were created by people who are like "but udisks is bloat!!1!" and whoever wrote them didn't really seem to know what he was doing because, for example, unmounting a device after it was unplugged from the system is completely non-sense.

HP LaserJet Enterprise 500 color M551dn - Optional USB Device port

Hi, I'm hoping to buy the optional wireless print server (HP Jetdirect 2700w USB Wireless Print Server J8026A). There is one problem though, the optional USB device port seems to not exist on my printer. I only notice that the USB logo is present where the port is supposed to be. The plastic in the area is squared off as though it is some sort of break away tab and the port is underneath maybe.
There is no reference to this in the manual anywhere and I am really unsure how to proceed. I don't want to damage anything.
If someone experienced with this model (preferably an HP Employee) can confirm the availability of the port and tell me how to access it (Is it a break away tab?). Part of the reason why I bought this printer is the optional Wireless N print server.
Thank You in advance.

Thank You for your reply. The port you are talking about is the front panel port for walk-up usb printing and firmware upgrades. This port is indeed available on the higher end LaserJet 500 (NON-MFP, printer only edition) as I just used it to upgrade the firmware. The port I am talking about is the one on the left side in the ports section which you use to plug in the optional print server (not the computer I/O port).
This is shown in the official manual and the spec sheet so I'm 85% sure the port is there, hp can't advertise and mention something that is not available as this would be a big problem and make the 2700w print server incompatible when it clearly states that it is. I just need someone to confirm the availability and clear my confusion (either from HP, or another owner who bought the wireless print server 2700w).

[SOLVED] Changing USB device option in /sys at boot

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