The cause of the freeze seems to be a BIOS problem, as Alan suggested on the linux-usb mailing list. When booting in UEFI mode (from a Xubuntu 15.04 installation medium), three of the devices listed by lspci are missing, compared to legacy BIOS mode. One of those is the device that caused the freezes. Looks like some of the hardware is unused, and Acer just hides it from the OS. But only in UEFI mode.
I'll try a re-installation of Xubuntu in UEFI mode. ** Attachment added: "output of lspci when booting in UEFI mode (insecure)" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485057/+attachment/4474853/+files/lspci-uefi.txt -- 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/1485057 Title: "lsusb -v" as root freezes the kernel on Acer ES1-111; also freeze on shutdown Status in linux package in Ubuntu: Triaged Bug description: reproducible: always Steps to reproduce: - open a terminal - sudo bash - lsusb -v In a virtual terminal, the command prints the name of the first device it finds, then the system freezes completely. In a terminal of the desktop, I don't even get the name of the device, the system freezes immediately. Either way, I have to power off the machine. There is no kernel oops. Nothing is written to the log. The magic sysreq key yields no response, although I have verified that it works before triggering the freeze. I've narrowed down the problem by calling "lsusb -v -s <device>". The system freezes on both devices of bus 3 (003:001 and 003:002). For all other devices, it prints the expected output and continues to work. When calling lsusb as a regular user, I get "Couldn't open device, some information will be missing", then the regular output, and the system keeps running. Therefore I assume that the problem is somewhere in the kernel, when the devices are accessed. This is a regression. It used to work in 14.10, and fails to work since 15.04. It also used to work in 14.04.2, and fails in 14.04.3. It fails with mainline builds 4.2.0-rc6-unstable, 4.2.0-rc2-unstable, 4.1.0-rc2-vivid. (yeah, I've been trying for a while :-) Incidentally, the shutdown sequence also freezes with the kernels that exhibit the problem; but I cannot be sure that the cause is the same. I decided to first chase the USB freeze, because it was easier to gather information about that. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-25-generic 3.19.0-25.26 ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2 Uname: Linux 3.19.0-25-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: rweber 1525 F.... pulseaudio CurrentDesktop: XFCE Date: Fri Aug 14 18:38:36 2015 HibernationDevice: RESUME=UUID=8a45266d-0232-428e-bb25-113d23caaf8a InstallationDate: Installed on 2015-06-28 (46 days ago) InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) MachineType: Acer Aspire ES1-111M ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=b8872e03-7295-4cbd-ac86-06b9be2f112f ro quiet splash crashkernel=384M-:128M vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.19.0-25-generic N/A linux-backports-modules-3.19.0-25-generic N/A linux-firmware 1.143.3 SourcePackage: linux UpgradeStatus: Upgraded to vivid on 2015-07-05 (39 days ago) dmi.bios.date: 08/20/2014 dmi.bios.vendor: Insyde Corp. dmi.bios.version: V1.08 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: R2 dmi.board.vendor: Acer dmi.board.version: Type2 - A01 Board Version dmi.chassis.type: 10 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.08:bd08/20/2014:svnAcer:pnAspireES1-111M:pvrV1.08:rvnAcer:rnR2:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion: dmi.product.name: Aspire ES1-111M dmi.product.version: V1.08 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485057/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
