This "^@" - Problem still exist. (Linux 4.7.6) But it seems to be solved when i turn off modesetting for the radeon module.
-- 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/1063658 Title: Unknown "Video Bus" device continuously generates keys combination Status in linux package in Ubuntu: Expired Bug description: Issue starts at boot process and looks like repetitive generation "^@" symbol combination in console. In the graphical interface it causes windows and cursor flickering, but only after login screen (login screen is working well) and when switching to console (ctrl + alt + f1) I'm not able to login because all keyboard input is mixed with "^@" symbols. Experimentally I found that issue is caused by unknown device listed as "Video Bus" in xinput --list: $xinput --list --long ↳ Video Bus id=8 [slave keyboard (3)] This device is disabled Reporting 1 classes: Class originated from: 8. Type: XIKeyClass Keycodes supported: 248 When device is disabled by following command: $xinput set-prop 8 "Device Enabled" 0 Flickering of graphics stops, and after switching to console (ctrl + alt + f1) and back (ctrl + alt + f7) the device is enabled back. If second monitor is plugged flickering of windows stops and system starts to turn off and on both monitors with different resolutions. Here are all possible details of the "Video Bus" device which I managed to found: $xinput --watch-props 8 Device 'Video Bus': Device Enabled (140): 0 Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 Device Product ID (257): 0, 6 Device Node (258): "/dev/input/event7" Virtual Device (259): 1 $cat /proc/bus/input/devices I: Bus=0019 Vendor=0000 Product=0006 Version=0000 N: Name="Video Bus" P: Phys=LNXVIDEO/video/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:19/LNXVIDEO:00/input/input7 U: Uniq= H: Handlers=kbd event7 B: PROP=0 B: EV=3 B: KEY=3e000b 0 0 0 0 0 0 0 $lsinput -v /dev/input/event7 bustype : BUS_HOST vendor : 0x0 product : 0x6 version : 0 name : "Video Bus" phys : "LNXVIDEO/video/input0" bits ev : EV_SYN EV_KEY I'm sure that it is not defective hardware-caused issue because: 1) Laptop has been diagnosed in service center, 2) There is no issues in MS Windows ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-31-generic-pae 3.2.0-31.50 ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28 Uname: Linux 3.2.0-31-generic-pae i686 NonfreeKernelModules: fglrx AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu13 Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: zuker 2378 F.... pulseaudio CRDA: country AU: (2402 - 2482 @ 40), (N/A, 20) (5170 - 5250 @ 40), (3, 23) (5250 - 5330 @ 40), (3, 23), DFS (5735 - 5835 @ 40), (3, 30) Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf7c00000 irq 51' Mixer name : 'Intel CougarPoint HDMI' Components : 'HDA:111d76d1,102804b3,00100205 HDA:80862805,80860101,00100000' Controls : 23 Simple ctrls : 11 Date: Mon Oct 8 12:20:51 2012 HibernationDevice: RESUME=UUID=1b4ff2b2-b40f-4b46-8a5c-29172cb6e299 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423) MachineType: Dell Inc. Vostro 3550 ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic-pae root=UUID=88fd96e5-1fee-4a86-badb-87fe4d32cb0c ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-31-generic-pae N/A linux-backports-modules-3.2.0-31-generic-pae N/A linux-firmware 1.79.1 SourcePackage: linux StagingDrivers: mei UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/30/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0PD77K dmi.board.vendor: Dell Inc. dmi.board.version: A09 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA09:bd09/30/2011:svnDellInc.:pnVostro3550:pvrNotSpecified:rvnDellInc.:rn0PD77K:rvrA09:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Vostro 3550 dmi.product.version: Not Specified dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1063658/+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
