Tried talking about this on IRC (#intel-gfx on FreeNode). It was suggested to me to capture the kernel log after setting drm.debug to 0x5. That produced quite a lot of log output (70 thousand lines in about a minute), and after some trimming I got something that could perhaps be useful: https://gist.github.com/mgedmin/8686551
This is me unplugging the DisplayPort connector: Jan 29 13:49:59 platonas kernel: [ 2041.110857] [drm:i915_hotplug_work_func], running encoder hotplug functions Jan 29 13:49:59 platonas kernel: [ 2041.110861] [drm:i915_hotplug_work_func], Connector HDMI-A-1 (pin 4) received hotplug event. Jan 29 13:49:59 platonas kernel: [ 2041.110863] [drm:i915_hotplug_work_func], Connector DP-1 (pin 4) received hotplug event. Jan 29 13:49:59 platonas kernel: [ 2041.125448] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus dpb Jan 29 13:49:59 platonas kernel: [ 2041.125457] [drm:intel_hpd_irq_event], [CONNECTOR:16:HDMI-A-1] status updated from 1 to 2 Jan 29 13:49:59 platonas kernel: [ 2041.125464] [drm:intel_hpd_irq_event], [CONNECTOR:20:DP-1] status updated from 2 to 2 Jan 29 13:49:59 platonas kernel: [ 2041.125466] [drm:drm_sysfs_hotplug_event], generating hotplug event This is me plugging it back in (it wasn't detected by gnome-shell; xrandr --current didn't see it): Jan 29 13:50:05 platonas kernel: [ 2046.777640] [drm:i915_hotplug_work_func], running encoder hotplug functions Jan 29 13:50:05 platonas kernel: [ 2046.777655] [drm:i915_hotplug_work_func], Connector HDMI-A-1 (pin 4) received hotplug event. Jan 29 13:50:05 platonas kernel: [ 2046.777661] [drm:i915_hotplug_work_func], Connector DP-1 (pin 4) received hotplug event. Jan 29 13:50:05 platonas kernel: [ 2046.778046] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus dpb Jan 29 13:50:05 platonas kernel: [ 2046.778051] [drm:intel_hpd_irq_event], [CONNECTOR:16:HDMI-A-1] status updated from 2 to 2 Jan 29 13:50:05 platonas kernel: [ 2046.780633] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:05 platonas kernel: [ 2046.789040] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:05 platonas kernel: [ 2046.797004] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:05 platonas kernel: [ 2046.802468] [drm:intel_hpd_irq_event], [CONNECTOR:20:DP-1] status updated from 2 to 2 Jan 29 13:50:05 platonas kernel: [ 2046.830695] crtc 1 : v 7 p(0,-23)@ 2046.796294 -> 2046.796779 [e 2 us, 0 rep] This is me running xrandr to force monitor detection: Jan 29 13:50:13 platonas kernel: [ 2054.453968] [drm:drm_mode_getconnector], [CONNECTOR:7:?] Jan 29 13:50:13 platonas kernel: [ 2054.453976] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:7:LVDS-1] Jan 29 13:50:13 platonas kernel: [ 2054.454000] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:7:LVDS-1] probed modes : Jan 29 13:50:13 platonas kernel: [ 2054.454005] [drm:drm_mode_debug_printmodeline], Modeline 10:"1366x768" 60 74800 1366 1414 1446 1578 768 770 775 790 0x48 0xa Jan 29 13:50:13 platonas kernel: [ 2054.454022] [drm:drm_mode_getconnector], [CONNECTOR:7:?] Jan 29 13:50:13 platonas kernel: [ 2054.454571] [drm:drm_mode_getconnector], [CONNECTOR:13:?] Jan 29 13:50:13 platonas kernel: [ 2054.454576] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:13:VGA-1] Jan 29 13:50:13 platonas kernel: [ 2054.454583] [drm:intel_ironlake_crt_detect_hotplug], ironlake hotplug adpa=0xf40000, result 0 Jan 29 13:50:13 platonas kernel: [ 2054.454588] [drm:intel_crt_detect], CRT not detected via hotplug Jan 29 13:50:13 platonas kernel: [ 2054.454766] [drm:gmbus_xfer], GMBUS [i915 gmbus vga] NAK for addr: 0050 r(1) Jan 29 13:50:13 platonas kernel: [ 2054.454773] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus vga Jan 29 13:50:13 platonas kernel: [ 2054.454777] [drm:intel_crt_get_edid], CRT GMBUS EDID read failed, retry using GPIO bit-banging Jan 29 13:50:13 platonas kernel: [ 2054.454780] [drm:intel_gmbus_force_bit], enabling bit-banging on i915 gmbus vga. force bit now 1 Jan 29 13:50:13 platonas kernel: [ 2054.455160] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus vga Jan 29 13:50:13 platonas kernel: [ 2054.455163] [drm:intel_gmbus_force_bit], disabling bit-banging on i915 gmbus vga. force bit now 0 Jan 29 13:50:13 platonas kernel: [ 2054.455167] [drm:intel_crt_detect_ddc], CRT not detected via DDC:0x50 [no valid EDID found] Jan 29 13:50:13 platonas kernel: [ 2054.455171] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:13:VGA-1] disconnected Jan 29 13:50:13 platonas kernel: [ 2054.455186] [drm:drm_mode_getconnector], [CONNECTOR:16:?] Jan 29 13:50:13 platonas kernel: [ 2054.455190] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] Jan 29 13:50:13 platonas kernel: [ 2054.533988] [drm:drm_edid_to_eld], ELD: no CEA Extension found Jan 29 13:50:13 platonas kernel: [ 2054.534016] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] probed modes : Jan 29 13:50:13 platonas kernel: [ 2054.534021] [drm:drm_mode_debug_printmodeline], Modeline 32:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x48 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534028] [drm:drm_mode_debug_printmodeline], Modeline 42:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534034] [drm:drm_mode_debug_printmodeline], Modeline 33:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534040] [drm:drm_mode_debug_printmodeline], Modeline 34:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534046] [drm:drm_mode_debug_printmodeline], Modeline 43:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534052] [drm:drm_mode_debug_printmodeline], Modeline 44:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534064] [drm:drm_mode_debug_printmodeline], Modeline 45:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534065] [drm:drm_mode_debug_printmodeline], Modeline 46:"832x624" 75 57284 832 864 928 1152 624 625 628 667 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534067] [drm:drm_mode_debug_printmodeline], Modeline 51:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534068] [drm:drm_mode_debug_printmodeline], Modeline 52:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534070] [drm:drm_mode_debug_printmodeline], Modeline 35:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534072] [drm:drm_mode_debug_printmodeline], Modeline 36:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5 Jan 29 13:50:13 platonas kernel: [ 2054.534073] [drm:drm_mode_debug_printmodeline], Modeline 37:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534075] [drm:drm_mode_debug_printmodeline], Modeline 38:"640x480" 73 31500 640 664 704 832 480 489 491 520 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534076] [drm:drm_mode_debug_printmodeline], Modeline 39:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534078] [drm:drm_mode_debug_printmodeline], Modeline 40:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa Jan 29 13:50:13 platonas kernel: [ 2054.534079] [drm:drm_mode_debug_printmodeline], Modeline 41:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6 Jan 29 13:50:13 platonas kernel: [ 2054.534114] [drm:drm_mode_getconnector], [CONNECTOR:16:?] Jan 29 13:50:13 platonas kernel: [ 2054.534149] [drm:drm_mode_getconnector], [CONNECTOR:20:?] Jan 29 13:50:13 platonas kernel: [ 2054.534151] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:20:DP-1] Jan 29 13:50:13 platonas kernel: [ 2054.536673] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:13 platonas kernel: [ 2054.546230] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:13 platonas kernel: [ 2054.554225] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x7143003f Jan 29 13:50:13 platonas kernel: [ 2054.559723] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:20:DP-1] disconnected Jan 29 13:50:13 platonas kernel: [ 2054.559768] [drm:drm_mode_getconnector], [CONNECTOR:22:?] Jan 29 13:50:13 platonas kernel: [ 2054.559773] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:22:HDMI-A-2] Jan 29 13:50:13 platonas kernel: [ 2054.560047] [drm:gmbus_xfer], GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1) Jan 29 13:50:13 platonas kernel: [ 2054.560060] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus dpc Jan 29 13:50:13 platonas kernel: [ 2054.560066] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:22:HDMI-A-2] disconnected Jan 29 13:50:13 platonas kernel: [ 2054.560089] [drm:drm_mode_getconnector], [CONNECTOR:24:?] Jan 29 13:50:13 platonas kernel: [ 2054.560095] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:24:HDMI-A-3] Jan 29 13:50:13 platonas kernel: [ 2054.560357] [drm:gmbus_xfer], GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1) Jan 29 13:50:13 platonas kernel: [ 2054.560370] [drm:drm_do_probe_ddc_edid], drm: skipping non-existent adapter i915 gmbus dpd Jan 29 13:50:13 platonas kernel: [ 2054.560376] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:24:HDMI-A-3] disconnected Jan 29 13:50:13 platonas kernel: [ 2054.560399] [drm:drm_mode_getconnector], [CONNECTOR:26:?] Jan 29 13:50:13 platonas kernel: [ 2054.560405] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:26:DP-2] Jan 29 13:50:13 platonas kernel: [ 2054.560412] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:26:DP-2] disconnected Jan 29 13:50:13 platonas kernel: [ 2054.560421] [drm:drm_mode_getconnector], [CONNECTOR:28:?] Jan 29 13:50:13 platonas kernel: [ 2054.560425] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:28:DP-3] Jan 29 13:50:13 platonas kernel: [ 2054.560431] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:28:DP-3] disconnected -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1263681 Title: 8086:0126 [Lenovo a ThinkPad X220] DisplayPort-2-DVI not hotplugging Status in “xserver-xorg-video-intel” package in Ubuntu: Incomplete Bug description: WIth my Lenovo ThinkPad X220 I am unable to hotplug a DisplayPort-2-DVI cable, plug the DVI end into a monitor (Samsung SyncMaster 193p+), and plug the DP end into the ThinkPad, and it is detected within a reasonable time, with GNOME automatically extending my desktop. If I *unplug* the DP cable, the unplug is detected instantly. I once waited ~5 minutes without running xrandr, and it actually detected the monitor and reconfigured. WORKAROUND: If I run 'xrandr' in an xterm, the monitor is detected instantly and GNOME reconfigures the screen. WORKAROUND: if I open System Preferences -> Display, it does an xrandr probe and instantly detects/reconfigures the screen. WORKAROUND: if I plug the DP cable before I open the laptop lid to wake it up from S3 sleep, the external monitor is detected. WORKAROUND: if I use a VGA cable instead of the DP -> DVI one, hotplug is detected within seconds. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-extra-3.11.0-15-generic 3.11.0-15.23 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 Uname: Linux 3.11.0-15-generic x86_64 ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mg 2722 F.... pulseaudio Date: Mon Dec 23 14:33:12 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=bf592a79-5f4e-486d-b69d-7525d492dcc6 InstallationDate: Installed on 2012-07-25 (515 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) Lsusb: Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: LENOVO 4291WJF MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=36079681-53fc-4ca2-80ac-98321c07e8d2 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-15-generic N/A linux-backports-modules-3.11.0-15-generic N/A linux-firmware 1.116 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to saucy on 2013-10-17 (66 days ago) WifiSyslog: dmi.bios.date: 05/31/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 8DET47WW (1.17 ) dmi.board.asset.tag: Not Available dmi.board.name: 4291WJF 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:bvr8DET47WW(1.17):bd05/31/2011:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4291WJF dmi.product.version: ThinkPad X220 dmi.sys.vendor: LENOVO --- ApportVersion: 2.12.7-0ubuntu6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 2713 F.... pulseaudio CasperVersion: 1.336ubuntu1 CurrentDesktop: Unity DistroRelease: Ubuntu 14.04 LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109) Lsusb: Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: LENOVO 4291WJF MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7 RelatedPackageVersions: linux-restricted-modules-3.13.0-1-generic N/A linux-backports-modules-3.13.0-1-generic N/A linux-firmware 1.119 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: trusty Uname: Linux 3.13.0-1-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 07/18/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 8DET69WW (1.39 ) dmi.board.asset.tag: Not Available dmi.board.name: 4291WJF 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:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4291WJF dmi.product.version: ThinkPad X220 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1263681/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
