| 2012-10-08 09:54:45 |
Leonid Kuzmin |
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 beacuse: 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. |
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. |
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