Created attachment 73153 [details] list of currently loaded modules I'm observing the issue discussed in this bug report: https://bugzilla.kernel.org/show_bug.cgi?id=43190 I'm reporting it here since the original reporter didn't seem to have reported here: I get this output repeatedly after every minute or so: [ 465.435298] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 465.438295] sd 6:0:0:0: [sdb] Asking for cache data failed [ 465.438303] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 517.147818] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 517.150811] sd 6:0:0:0: [sdb] Asking for cache data failed [ 517.150822] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 568.859459] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 568.862330] sd 6:0:0:0: [sdb] Asking for cache data failed [ 568.862339] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 620.571790] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 620.574659] sd 6:0:0:0: [sdb] Asking for cache data failed However, when I put in a memory card it stops after outputting this: [ 1543.770351] sd 6:0:0:0: [sdb] 3970048 512-byte logical blocks: (2.03 GB/1.89 GiB) [ 1543.775577] sd 6:0:0:0: [sdb] No Caching mode page present [ 1543.775586] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 1543.780604] sd 6:0:0:0: [sdb] No Caching mode page present [ 1543.780611] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 1543.807961] sdb: sdb1 and once I eject the memory card it continues: [ 4980.766490] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 5032.474959] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 5032.477961] sd 6:0:0:0: [sdb] Asking for cache data failed [ 5032.477970] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 5084.187541] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 5084.190546] sd 6:0:0:0: [sdb] Asking for cache data failed [ 5084.190554] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 5135.899244] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled [ 5135.902369] sd 6:0:0:0: [sdb] Asking for cache data failed [ 5135.902378] sd 6:0:0:0: [sdb] Assuming drive cache: write through
Created attachment 73154 [details] lspci
Created attachment 73155 [details] scsi
*** Bug 43190 has been marked as a duplicate of this bug. ***
Noticed this on a "Lenovo Ideapad S10" as well. Ubuntu #925760 has a workaround for this: $ rmmod ums_realtek usbcore: deregistering interface driver ums-realtek And the messages stop. As soon as the module is loaded again, the messages resume and repeat every 52 seconds: $ modprobe ums_realtek May 2 23:50:46 scsi5 : usb-storage 1-5:1.0 May 2 23:50:46 usbcore: registered new interface driver ums-realtek May 2 23:50:47 scsi 5:0:0:0: Direct-Access Generic- Multi-Card 1.00 PQ: 0 ANSI: 0 CCS May 2 23:50:47 sd 5:0:0:0: Attached scsi generic sg1 type 0 May 2 23:50:47 sd 5:0:0:0: [sdb] Attached SCSI removable disk May 2 23:51:38 sd 5:0:0:0: [sdb] Test WP failed, assume Write Enabled May 2 23:51:38 sd 5:0:0:0: [sdb] Asking for cache data failed May 2 23:51:38 sd 5:0:0:0: [sdb] Assuming drive cache: write through May 2 23:52:30 sd 5:0:0:0: [sdb] Test WP failed, assume Write Enabled May 2 23:52:30 sd 5:0:0:0: [sdb] Asking for cache data failed May 2 23:52:30 sd 5:0:0:0: [sdb] Assuming drive cache: write through
Created attachment 73164 [details] dmesg; lspci; lspci -v; lspci -vvv; cat /proc/scsi/scsi; lsmod
I can confirm it happens with my Netbook LG x110 as well. I attach a boot.log
Created attachment 73217 [details] dmesg output dmesg output of Netbook LG x110
See <https://bugzilla.redhat.com/show_bug.cgi?id=769747> for other udev---kernel debugging.
The issue is caused by ums_realtek module's 'selective suspend' operation. This option is enabled by default and - using its default delay timer of 50 seconds - triggers these events. The driver seems to implement it's own sleep functionality and timer whilst also telling the kernel it supports auto-suspend callbacks.
I have an issue that may be the same But i have much higher rate of errors, and it is continuously a couple hundred pair of message lines per second when i plug in a small video camera and do not have the microSD inserted in it. And it also spews out the messages if i have the card inserted, if i power on the machine with it attached. Do you think it is the same issue? For details see: https://bugs.mageia.org/show_bug.cgi?id=10038
I can confirm - this problem causes Realtek card reader. This small work around works for me well - http://askubuntu.com/a/337802
Sorry I forgot: modinfo ums_realtek filename: /lib/modules/3.11.10-200.fc19.x86_64/kernel/drivers/usb/storage/ums-realtek.ko version: 1.03 license: GPL author: wwang <wei_wang@realsil.com.cn> description: Driver for Realtek USB Card Reader srcversion: 7211D16D16BECBF334341D5 alias: usb:v0BDAp0159d*dc*dsc*dp*ic*isc*ip*in* alias: usb:v0BDAp0158d*dc*dsc*dp*ic*isc*ip*in* alias: usb:v0BDAp0138d*dc*dsc*dp*ic*isc*ip*in* depends: usb-storage intree: Y vermagic: 3.11.10-200.fc19.x86_64 SMP mod_unload signer: Fedora kernel signing key sig_key: 73:A1:46:50:5C:77:01:B9:19:75:E6:40:A2:56:94:5B:70:16:C5:D0 sig_hashalgo: sha256 parm: auto_delink_en:enable auto delink (int) parm: ss_en:enable selective suspend (int) parm: ss_delay:seconds to delay before entering selective suspend (int