Launchpad has imported 3 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=44881.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2012-01-18T08:41:02+00:00 Bryce Harrington wrote: Forwarding this bug from Ubuntu reporter Roland Dreier: http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/912387 [Problem] Currently, the login screen is set to mirrored (at a lower resolution). On login, the system reconfigures the displays to their native resolutions, but the external DP monitor just shows black. The kernel log shows: [ 382.963872] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting [Original Description] I have a Lenovo t410s laptop (Arrandale graphics) that I use with a docking station that is connected to an external monitor via displayport. I just updated from Oneiric to the latest Precise daily, and I've seen big regressions using this setup. I went into the display control panel and set my monitors to be non-mirrored and set my DP monitor to its native (2560x1440) resolution. Now, after a cold reboot, the login screen comes up fine (in its bad fallback resolution -- this I think is a known lightdm issue, where a laptop+external monitor ends up with lightdm using some non-native resolution). But then when I log in, X tries to change the mode of the DP monitor to the correct one, and at that point the monitor just goes black. If I do alt-f1 I can get back to a text console, but alt-f7 just goes back to the black screen. I am able to open my laptop and bring up the LVDS1 output, but I have not been able to figure out how to light up the DP output. Oneiric was able to handle this pretty well -- if I booted docked, the external monitor was used at its native resolution, and if I booted undocked the internal LVDS was used at its native resolution. And even suspend/resume and docking/undocking usually worked. I see messages like: [ 382.963872] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting in the kernel log, which are presumably related to the failure to light up the DP monitor. DistroRelease: Ubuntu 12.04 Package: xserver-xorg-video-intel 2:2.15.901-1ubuntu4 ProcVersionSignature: Ubuntu 3.2.0-7.13-generic 3.2.0-rc7 Uname: Linux 3.2.0-7-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 1.90-0ubuntu1 Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,gnomecompat,grid,move,snap,vpswitch,place,regex,session,imgpng,mousepoll,animation,wall,expo,unitymtgrabhandles,fade,workarounds,scale,ezoom,unityshell] CompositorRunning: compiz Date: Thu Jan 5 08:55:36 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu EcryptfsInUse: Yes ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu GraphicsCard: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:21c1] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120104) MachineType: LENOVO 2901CTO ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-7-generic root=UUID=677292b2-a7ba-4d9e-8f1a-662c546b62ce ro intel_iommu=igfx_off quiet splash vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/27/2010 dmi.bios.vendor: LENOVO dmi.bios.version: 6UET61WW (1.41 ) dmi.board.name: 2901CTO 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:bvr6UET61WW(1.41):bd10/27/2010:svnLENOVO:pn2901CTO:pvrThinkPadT410s:rvnLENOVO:rn2901CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2901CTO dmi.product.version: ThinkPad T410s dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.29-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4 version.xserver-xorg-core: xserver-xorg-core 2:1.10.4-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1 Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/912387/comments/10 ------------------------------------------------------------------------ On 2012-01-18T08:43:18+00:00 Bryce Harrington wrote: Created attachment 55714 drm-dmesg.txt I added "drm.debug=0xe" to my kernel command line by hand, and got the following output. This is not exactly the scenario described above -- I actually booted up at home away from my dock, suspended the laptop, came to work, and resumed in the dock. I had exactly the same situation that my external monitor wouldn't light up though, and I went through my (now-standard) workaround dance of: - log into text kernel and do xrandr --output LVDS1 --auto to turn on the laptop screen - light up the DP monitor at 1024x768 - switch the DP monitor to 2560x1440 at the same time as I turn off the laptop screen and I now have my X session working at native resolution on my external monitor. Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/912387/comments/11 ------------------------------------------------------------------------ On 2012-01-18T08:43:39+00:00 Bryce Harrington wrote: Created attachment 55715 graphics-dp3-trace.txt OK, here's a kernel log of me booting up and then going through the dance to get my DP monitor lit up at the right resolution. Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/912387/comments/12 ** Changed in: xserver-xorg-video-intel Status: Unknown => Confirmed ** Changed in: xserver-xorg-video-intel Importance: Unknown => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/912387 Title: [arrandale] Black screen on login regression (oneiric->precise) with external displayport monitor To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/912387/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
