No USB storage automounting in LXDE

I'm running LXDE on top of Arch. I have followed the wiki, but it still does not seem to automatically mount my USB storage devices.
I can use dmesg to see that the device is inserted and recognized. I can manually mount the device and copy files.
I have done the following:
* Check the checkbox to automatically mount inserted storage devices in PCManFM
* Ensure that udisks2 is installed
* Add the policykit file described in the troubleshooting section of the PCManFM wiki (even though the problem it describes isn't exactly my problem)
This thread appears to be completely obsolete, so though I read it I didn't glean anything actionable
It isn't clear to me whether this thread is relevant to my interests; the resolution certainly isn't.
I can use udiskie to automount the USB media. Maybe I'm dumb for thinking that LXDE (or PCManFM) should do it for me without having to run udiskie first, but I figured I'd ask in case there's an easier way I'm not aware of.

jasonwryan wrote:If you are running systemd, and have an active session, then the polkit rule is unnecessary, unhelpful even.
OK, good to know. I'll remove the rule.
Thanks for the replies. Lucke, your guess makes sense...that would explain why all the LXDE info for automounting assumes it will just automagically work, even though it clearly doesn't.

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    [ 4981.404509] Buffer I/O error on device sdc1, logical block 263818
    [ 4981.404512] lost page write due to I/O error on sdc1
    [ 4981.404517] Buffer I/O error on device sdc1, logical block 263819
    [ 4981.404521] lost page write due to I/O error on sdc1
    [ 4981.404525] Buffer I/O error on device sdc1, logical block 263820
    [ 4981.404529] lost page write due to I/O error on sdc1
    [ 4981.404534] Buffer I/O error on device sdc1, logical block 263821
    [ 4981.404537] lost page write due to I/O error on sdc1
    [ 4981.404543] Buffer I/O error on device sdc1, logical block 263822
    [ 4981.404546] lost page write due to I/O error on sdc1
    [ 4981.404550] Buffer I/O error on device sdc1, logical block 263823
    [ 4981.404554] lost page write due to I/O error on sdc1
    [ 4981.444899] usb 1-4: USB disconnect, device number 3
    Next I thought – computer is broken. But it simply couldn't be true because in Ubuntu it's working.
    I wanted to test if USB transfer is working in other distros, so I downloaded few and tried:
    Ubuntu 11.04 – everything is working
    Ubuntu 11.10 – it's not working, exactly same errors as in Arch
    Ubuntu 12.04 Alpha 2 – it's not working
    Mint 11 – it's working
    Mint 12 – it's not working
    So one thing in common that I can think of is fact that USB transfer is working in distros using kernel <3.0 and is broken in those using kernel >=3.0.
    In dmesg output I can see ehci_hcd errors. When I remove this module before moving files, than everything is working fine apart from very slow transfer but it's obvious.
    I really hope that someone will be able to help with my problem.  I don't know if it's some bug or it's just some configuration error.
    EDIT: problems were caused by rts5139 module (card reader). Blacklisting that module solved all the problems.
    Last edited by wpb (2012-07-01 08:37:02)

    Ok,  so here is part of /var/log/messages.log with failed USB transfer:
    Feb 28 20:21:40 localhost kernel: [ 117.263584] usb 3-2: new high-speed USB device number 4 using ehci_hcd
    Feb 28 20:21:40 localhost mtp-probe: checking bus 3, device 4: "/sys/devices/pci0000:00/0000:00:12.2/usb3/3-2"
    Feb 28 20:21:40 localhost kernel: [ 117.470130] ehci_hcd 0000:00:13.2: BAR 0: set to [mem 0xfeb48000-0xfeb480ff] (PCI address [0xfeb48000-0xfeb480ff])
    Feb 28 20:21:40 localhost kernel: [ 117.470251] ehci_hcd 0000:00:13.2: PCI INT B -> GSI 17 (level, low) -> IRQ 17
    Feb 28 20:21:40 localhost kernel: [ 117.546266] ohci_hcd 0000:00:13.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
    Feb 28 20:21:40 localhost mtp-probe: bus: 3, device: 4 was not an MTP device
    Feb 28 20:21:42 localhost kernel: [ 119.687034] usbcore: registered new interface driver uas
    Feb 28 20:21:42 localhost kernel: [ 119.692675] Initializing USB Mass Storage driver...
    Feb 28 20:21:42 localhost kernel: [ 119.693029] scsi7 : usb-storage 3-2:1.0
    Feb 28 20:21:42 localhost kernel: [ 119.694285] usbcore: registered new interface driver usb-storage
    Feb 28 20:21:42 localhost kernel: [ 119.694294] USB Mass Storage support registered.
    Feb 28 20:21:43 localhost kernel: [ 120.353657] ohci_hcd 0000:00:13.0: PCI INT A disabled
    Feb 28 20:21:43 localhost kernel: [ 121.110815] scsi 7:0:0:0: Direct-Access JetFlash Transcend 8GB 1100 PQ: 0 ANSI: 0 CCS
    Feb 28 20:21:43 localhost kernel: [ 121.115125] sd 7:0:0:0: [sdc] 15826944 512-byte logical blocks: (8.10 GB/7.54 GiB)
    Feb 28 20:21:43 localhost kernel: [ 121.117132] sd 7:0:0:0: [sdc] Write Protect is off
    Feb 28 20:21:43 localhost kernel: [ 121.125243] sdc: sdc1
    Feb 28 20:21:43 localhost kernel: [ 121.130244] sd 7:0:0:0: [sdc] Attached SCSI removable disk
    Feb 28 20:21:44 localhost kernel: [ 121.570240] ehci_hcd 0000:00:13.2: PCI INT B disabled
    Feb 28 20:21:44 localhost ntfs-3g[1936]: Version 2012.1.15 external FUSE 28
    Feb 28 20:21:44 localhost ntfs-3g[1936]: Mounted /dev/sdc1 (Read-Write, label "", NTFS 3.1)
    Feb 28 20:21:44 localhost ntfs-3g[1936]: Cmdline options: rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,dmask=0077,fmask=0177
    Feb 28 20:21:44 localhost ntfs-3g[1936]: Mount options: rw,nosuid,nodev,uhelper=udisks,allow_other,nonempty,relatime,fsname=/dev/sdc1,blkdev,blksize=4096,default_permissions
    Feb 28 20:21:44 localhost ntfs-3g[1936]: Global ownership and permissions enforced, configuration type 1
    Feb 28 20:22:11 localhost kernel: [ 148.692914] usb 3-2: USB disconnect, device number 4
    Feb 28 20:22:11 localhost kernel: [ 148.756937] sd 7:0:0:0: [sdc] Unhandled error code
    Feb 28 20:22:11 localhost kernel: [ 148.756947] sd 7:0:0:0: [sdc] Result: hostbyte=0x01 driverbyte=0x00
    Feb 28 20:22:11 localhost kernel: [ 148.756954] sd 7:0:0:0: [sdc] CDB: cdb[0]=0x2a: 2a 00 00 1e 2f f6 00 00 18 00
    Feb 28 20:22:11 localhost kernel: [ 148.756983] lost page write due to I/O error on sdc1
    Feb 28 20:22:11 localhost kernel: [ 148.757000] lost page write due to I/O error on sdc1
    Feb 28 20:22:11 localhost kernel: [ 148.757016] lost page write due to I/O error on sdc1
    Feb 28 20:22:11 localhost kernel: [ 148.761894] sd 7:0:0:0: [sdc] Unhandled error code
    Feb 28 20:22:11 localhost kernel: [ 148.761905] sd 7:0:0:0: [sdc] Result: hostbyte=0x01 driverbyte=0x00
    Feb 28 20:22:11 localhost kernel: [ 148.761911] sd 7:0:0:0: [sdc] CDB: cdb[0]=0x2a: 2a 00 00 1e 2f ae 00 00 08 00
    Feb 28 20:22:11 localhost kernel: [ 148.761939] lost page write due to I/O error on sdc1
    Feb 28 20:22:11 localhost kernel: [ 148.914173] usb 3-4: USB disconnect, device number 3
    Feb 28 20:22:24 localhost ntfs-3g[1936]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
    Feb 28 20:22:24 localhost ntfs-3g[1936]: Reading $BITMAP failed: Input/output error
    Feb 28 20:22:24 localhost ntfs-3g[1936]: Failed to allocate clusters: Input/output error
    Feb 28 20:22:24 localhost kernel: [ 161.862408] quiet_error: 2 callbacks suppressed
    Feb 28 20:22:24 localhost kernel: [ 161.862424] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862436] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862446] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862457] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862466] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862476] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862485] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862495] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862505] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost kernel: [ 161.862514] lost page write due to I/O error on sdc1
    Feb 28 20:22:24 localhost ntfs-3g[1936]: Unmounting /dev/sdc1 ()
    and here is complete /var/log/messages.log - I just started system and then tried to copy some files to USB drive:

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