We can perform a kernel bisect to identify the commit that introduced this regression. We first need to identify the last kernel that did not have this bug and the first that did.
Can you next test the following kernels: v4.14-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc1/ v4.14 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14/ v4.15-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/ You don't have to test all of them. Just until you hit the first version that exhibits the bug. ** Changed in: linux (Ubuntu Bionic) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Bionic) Status: Confirmed => In Progress -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1751268 Title: bionic desktop does not boot with external monitor attached - [drm:ironlake_crtc_enable [i915]] *ERROR* mode set failed: pipe A stuck / vblank wait timed out on crtc 1 Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Bug description: Ubuntu Desktop Bionic up to date System doesn't boot with an external monitor attached. There is this message in the journal (full journal attached for this boot) fbcon: inteldrmfb (fb0) is primary device [drm:ironlake_crtc_enable [i915]] *ERROR* mode set failed: pipe A stuck vblank wait timed out on crtc 1 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 201 at /build/linux-UKCsxy/linux-4.13.0/drivers/gpu/drm/drm_vblank.c:1090 drm_wait_one_vblank+0x19b/0x1b0 [drm] Modules linked in: hid_lenovo uas usb_storage rtsx_usb_sdmmc rtsx_usb hid_generic usbhid hid i915 mxm_wmi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse ahci libahci drm wmi video CPU: 3 PID: 201 Comm: kworker/u8:6 Tainted: G U 4.13.0-32-generic #35-Ubuntu Hardware name: ASUSTeK COMPUTER INC. UX32VD/UX32VD, BIOS UX32VD.214 01/29/2013 Workqueue: events_unbound async_run_entry_fn task: ffff9760d81cae80 task.stack: ffffb01dc1fb8000 RIP: 0010:drm_wait_one_vblank+0x19b/0x1b0 [drm] RSP: 0018:ffffb01dc1fbb7c8 EFLAGS: 00010282 RAX: 000000000000001f RBX: ffff9760d7080000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000246 RBP: ffffb01dc1fbb828 R08: 000000000000001f R09: 000000000002af84 R10: ffffb01dc1fbb7c8 R11: 000000000000041b R12: 0000000000000001 R13: 0000000000000170 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff9760eef80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f156d6d68f0 CR3: 000000024660a002 CR4: 00000000001606e0 Call Trace: ? wait_woken+0x80/0x80 ironlake_crtc_enable+0x477/0xc00 [i915] ? gen6_write8+0x190/0x190 [i915] intel_update_crtc+0x4b/0xe0 [i915] intel_update_crtcs+0x5b/0x80 [i915] intel_atomic_commit_tail+0x254/0xf90 [i915] ? __schedule+0x293/0x880 intel_atomic_commit+0x3d5/0x490 [i915] ? drm_atomic_check_only+0x37b/0x540 [drm] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x15e/0x270 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x2e/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x1a/0x70 [i915] fbcon_init+0x484/0x650 visual_init+0xd6/0x130 do_bind_con_driver+0x1fc/0x410 do_take_over_console+0x82/0x1a0 do_fbcon_takeover+0x5c/0xb0 fbcon_event_notify+0x587/0x780 notifier_call_chain+0x4a/0x70 blocking_notifier_call_chain+0x43/0x60 fb_notifier_call_chain+0x1b/0x20 register_framebuffer+0x24d/0x360 drm_fb_helper_initial_config+0x249/0x400 [drm_kms_helper] intel_fbdev_initial_config+0x18/0x30 [i915] async_run_entry_fn+0x36/0x150 process_one_work+0x1e7/0x410 worker_thread+0x4b/0x420 kthread+0x125/0x140 ? process_one_work+0x410/0x410 ? kthread_create_on_node+0x70/0x70 ret_from_fork+0x1f/0x30 Code: ff e8 da 3b 4c d6 48 8b 7d a0 48 8d 75 a8 e8 dd 93 50 d6 45 85 ff 0f 85 0c ff ff ff 44 89 e6 48 c7 c7 d8 eb 3d c0 e8 b6 46 52 d6 <0f> ff e9 f6 fe ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 ---[ end trace a1db7ccd0b5e4dfc ]--- ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-10-generic 4.15.0-10.11 ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3 Uname: Linux 4.15.0-10-generic x86_64 ApportVersion: 2.20.8-0ubuntu10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: j-lallement 3671 F.... pulseaudio /dev/snd/controlC0: j-lallement 3671 F.... pulseaudio /dev/snd/controlC1: j-lallement 3671 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Fri Feb 23 13:58:39 2018 InstallationDate: Installed on 2013-09-03 (1633 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902) MachineType: ASUSTeK COMPUTER INC. UX32VD ProcEnviron: TERM=screen-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic root=UUID=1004226d-a9db-46c7-bd28-eca0806c12f2 ro pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 init=/lib/systemd/systemd-bootchart RelatedPackageVersions: linux-restricted-modules-4.15.0-10-generic N/A linux-backports-modules-4.15.0-10-generic N/A linux-firmware 1.171 SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2018-01-26 (27 days ago) dmi.bios.date: 01/29/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX32VD.214 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX32VD dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX32VD.214:bd01/29/2013:svnASUSTeKCOMPUTERINC.:pnUX32VD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX32VD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: UX dmi.product.name: UX32VD dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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