Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537465 Title: Idle too much time when loading snd-usb-audio.ko Status in linux package in Ubuntu: Incomplete Bug description: I'm using Ubuntu 16.04 amd64 Desktop, with kernel 4.3. And my USB Video Camera is from Gsou, containing both camera device and microphone device. When booting Ubuntu, after login ubuntu session, system freeze for around 40 seconds !! Finnally I found out that its "snd-usb-audio.ko" that makes it too slow when login. So I added "blacklist snd-usb-audio" into /etc/modprobe.d/blacklist.list, then everything is okay, login step works normally. After login desktop, I opened a terminal and execute "sudo modprobe snd-usb-audio" to load microphone device manually, then it's still very slow to load -- =============== ghostplant@ghostplant:~$ sudo modprobe snd-usb-audio real 0m41.301s user 0m0.540s sys 0m2.912s =========== After waiting 40s to load snd-usb-audio, "dmesg | mesg" displays a new message: [ 806.057680] usbcore: registered new interface driver snd-usb-audio So, I think there is a bug containning inside snd-usb-audio.ko, because it's not supposed to cost so much time. Note: In gnome-session, snd-usb-audio makes login step very slow like to be freeze: Click Login (<1s) => gnome-session loading components (compiz, unity-settings-daemon, .. # some required reading data from snd-hda-audio, >40s) Show Desktop (<1s) ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-extra-4.3.0-7-generic 4.3.0-7.18 ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3 Uname: Linux 4.3.0-7-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.3.0-7-generic. ApportVersion: 2.19.3-0ubuntu3 Architecture: amd64 CurrentDesktop: GNOME-Flashback Date: Sun Jan 24 17:03:43 2016 MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. PciMultimedia: ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-7-generic root=UUID=5cc5f01f-1440-4404-a8a1-db62012f312e ro quiet cgroup_enable=memory swapaccount=1 RelatedPackageVersions: linux-restricted-modules-4.3.0-7-generic N/A linux-backports-modules-4.3.0-7-generic N/A linux-firmware 1.155 RfKill: SourcePackage: linux StagingDrivers: r8188eu UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 03/23/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F5 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H61M-S1 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5:bd03/23/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH61M-S1:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537465/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
