[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.
Forwarding this bug from Ubuntu reporter Roland Dreier: bugs.launchpad. net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/912387
http://
[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: dp_complete_ link_train] *ERROR* failed to train DP, aborting
[ 382.963872] [drm:intel_
[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 xorg-video- intel 2:2.15.901-1ubuntu4 ature: Ubuntu 3.2.0-7.13-generic 3.2.0-rc7 support. test.0:
Package: xserver-
ProcVersionSign
Uname: Linux 3.2.0-7-generic x86_64
.tmp.unity.
ApportVersion: 1.90-0ubuntu1 detection, composite, opengl, compiztoolbox, decor,resize, gnomecompat, grid,move, snap,vpswitch, place,regex, session, imgpng, mousepoll, animation, wall,expo, unitymtgrabhand les,fade, workarounds, scale,ezoom, unityshell] nterest: Yes, whatever it takes to get this fixed in Ubuntu /boot/vmlinuz- 3.2.0-7- generic root=UUID= 677292b2- a7ba-4d9e- 8f1a-662c546b62 ce ro intel_iommu= igfx_off quiet splash vt.handoff=7 xorg-video- intel asset.tag: No Asset Information version: Not Available bvr6UET61WW( 1.41):bd10/ 27/2010: svnLENOVO: pn2901CTO: pvrThinkPadT410 s:rvnLENOVO: rn2901CTO: rvrNotAvailable :cvnLENOVO: ct10:cvrNotAvai lable: version: ThinkPad T410s bzr20110929- 0ubuntu8 libgl1- mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4 libgl1- mesa-dri- experimental: libgl1- mesa-dri- experimental N/A libgl1- mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4 xserver- xorg-core: xserver-xorg-core 2:1.10.4-1ubuntu6 xserver- xorg-input- evdev: xserver- xorg-input- evdev 1:2.6.0-1ubuntu13 xserver- xorg-video- ati: xserver- xorg-video- ati 1:6.14. 99~git20110811. g93fc084- 0ubuntu1 xserver- xorg-video- intel: xserver- xorg-video- intel 2:2.15.901-1ubuntu4 xserver- xorg-video- nouveau: xserver- xorg-video- nouveau 1:0.0.16+ git20111201+ b5534a1- 1
Architecture: amd64
CompizPlugins: [core,bailer,
CompositorRunning: compiz
Date: Thu Jan 5 08:55:36 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingI
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=
SourcePackage: xserver-
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.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 2901CTO
dmi.product.
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.6+
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.29-1ubuntu1
version.
version.
version.
version.
version.
version.
version.
version.