Public bug reported: Connected external monitor doesn't have signal from laptop. It was working two months ago. Expect that system upgrade did affected it.
The problem may be similar with http://bugs.debian.org/cgi- bin/bugreport.cgi?bug=658662 and https://bugs.freedesktop.org/show_bug.cgi?id=45801 and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/950263. But they are other kernel version. Here are my specs : sudo lshw -C display; lsb_release -a; uname -a; xrandr *-display description: VGA compatible controller product: Core Processor Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 02 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:43 memory:f2000000-f23fffff memory:d0000000-dfffffff ioport:1800(size=8) No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.04 Release: 11.04 Codename: natty Linux dontpanic 2.6.38-13-generic-pae #57-Ubuntu SMP Mon Mar 5 20:00:10 UTC 2012 i686 i686 i386 GNU/Linux Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192 LVDS1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 303mm x 189mm 1440x900 60.0*+ 59.9 50.0 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) 21:14> cat /proc/version_signature Ubuntu 2.6.38-13.57-generic-pae 2.6.38.8 DP1 disconnected -- it's not true, it's attached and switched on. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: linux-image (not installed) ProcVersionSignature: Ubuntu 2.6.38-13.57-generic-pae 2.6.38.8 Uname: Linux 2.6.38-13-generic-pae i686 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23. Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pmichalec 3134 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 45' Mixer name : 'Intel IbexPeak HDMI' Components : 'HDA:14f15069,17aa214c,00100302 HDA:80862804,17aa21b5,00100000' Controls : 13 Simple ctrls : 7 Card29.Amixer.info: Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6IHT35WW-1.10' Mixer name : 'ThinkPad EC 6IHT35WW-1.10' Components : '' Controls : 1 Simple ctrls : 1 Card29.Amixer.values: Simple mixer control 'Console',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Fri Mar 23 21:04:05 2012 HibernationDevice: RESUME=UUID=87f291dd-bc8d-4a16-83fe-52b1cb68e01f InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1) MachineType: LENOVO 2522AT6 ProcEnviron: LANGUAGE=en_US:en PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/zsh ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-13-generic-pae root=/dev/mapper/ubuntu-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-2.6.38-13-generic-pae N/A linux-backports-modules-2.6.38-13-generic-pae N/A linux-firmware 1.52 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/07/2010 dmi.bios.vendor: LENOVO dmi.bios.version: 6IET65WW (1.25 ) dmi.board.name: 2522AT6 dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr6IET65WW(1.25):bd06/07/2010:svnLENOVO:pn2522AT6:pvrThinkPadT410:rvnLENOVO:rn2522AT6:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2522AT6 dmi.product.version: ThinkPad T410 dmi.sys.vendor: LENOVO ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 natty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/963422 Title: No signal via DisplayPort - kernel 2.6.38-13-generic-pae #57-Ubuntu SMP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/963422/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
