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Message #58684
[Bug 1403228] Re: unable to connect external monitor
I don't need a backport as I found a way around it in14.04.
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https://bugs.launchpad.net/bugs/1403228
Title:
unable to connect external monitor
Status in xorg package in Ubuntu:
Incomplete
Bug description:
When connecting a BenQ T905 through HDMI with a resolution of around
1280x1020, the mouse starts wobling back and forth 4-5 times a second.
Checking the log, it seems like the system cant decide on a correct
resolution and changing it back and forth between different
resolutions 4-5 times a second.
There exists similar bugs for Ubuntu 14.04 based distros (Linux Mint 17),
https://bugs.launchpad.net/ubuntu/+bug/1332895
and reading there it seems its a problem with something not supporting lower than average external monitor resolutions. My main screen is 1366x768.
And if you scroll to the bottom of XorgLog.txt, it's actually changing
the refresh rate of the external monitor between 60 and 76 4-5 times a
second.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CasperVersion: 1.340
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Dec 16 22:16:10 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd Device [144d:c0d7]
LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C/532U3C
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/25/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P12ABH
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NP540U3C-A03SE
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP12ABH:bd10/25/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C/532U3C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP540U3C-A03SE:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 530U3C/530U4C/532U3C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Tue Dec 16 22:13:01 2014
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
xserver.version: 2:1.15.1-0ubuntu2
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References