Hello, I see that the problem is still present on Ubuntu 16.04 x86_64 on my Thinkpad T420. Can anybody confirm that? Also, what's the easiest workaround at the moment? Thanks.
holden@lynx:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial holden@lynx:~$ uname -a Linux lynx 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux Sep 23 00:33:20 lynx kernel: [ 965.988645] ------------[ cut here ]------------ Sep 23 00:33:20 lynx kernel: [ 965.988696] WARNING: CPU: 2 PID: 1328 at /build/linux-R0TiM8/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]() Sep 23 00:33:20 lynx kernel: [ 965.988698] vblank wait timed out on crtc 0 Sep 23 00:33:20 lynx kernel: [ 965.988771] Modules linked in: nls_iso8859_1 drbg ansi_cprng ctr ccm bnep intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel arc4 snd_hda_codec_hdmi kvm snd_hda_codec_conexant irqbypass iwldvm crct10dif_pclmul crc32_pclmul snd_hda_codec_generic mac80211 snd_hda_intel snd_hda_codec uvcvideo aesni_intel videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core aes_x86_64 v4l2_common snd_hda_core lrw snd_hwdep gf128mul videodev glue_helper media ablk_helper thinkpad_acpi cryptd nvram snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi iwlwifi snd_seq btusb input_leds joydev btrtl btbcm btintel snd_seq_device cfg80211 bluetooth snd_timer snd soundcore mei_me mei lpc_ich serio_raw shpchp mac_hid parport_pc ppdev lp parport autofs4 mmc_block i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops e1000e drm firewire_ohci ahci psmouse sdhci_pci ptp sdhci pps_core libahci firewire_core crc_itu_t wmi fjes video Sep 23 00:33:20 lynx kernel: [ 965.988793] CPU: 2 PID: 1328 Comm: Xorg Not tainted 4.4.0-38-generic #57-Ubuntu Sep 23 00:33:20 lynx kernel: [ 965.988795] Hardware name: LENOVO 4236BE3/4236BE3, BIOS 83ET78WW (1.48 ) 01/21/2016 Sep 23 00:33:20 lynx kernel: [ 965.988802] 0000000000000286 00000000b106ac7e ffff8802137af860 ffffffff813f1b73 Sep 23 00:33:20 lynx kernel: [ 965.988805] ffff8802137af8a8 ffffffffc010ab38 ffff8802137af898 ffffffff810811c2 Sep 23 00:33:20 lynx kernel: [ 965.988809] ffff880035847000 0000000000000000 0000000000000000 000000000000e240 Sep 23 00:33:20 lynx kernel: [ 965.988810] Call Trace: Sep 23 00:33:20 lynx kernel: [ 965.988824] [<ffffffff813f1b73>] dump_stack+0x63/0x90 Sep 23 00:33:20 lynx kernel: [ 965.988833] [<ffffffff810811c2>] warn_slowpath_common+0x82/0xc0 Sep 23 00:33:20 lynx kernel: [ 965.988837] [<ffffffff8108125c>] warn_slowpath_fmt+0x5c/0x80 Sep 23 00:33:20 lynx kernel: [ 965.988846] [<ffffffff810c38e5>] ? finish_wait+0x55/0x70 Sep 23 00:33:20 lynx kernel: [ 965.988877] [<ffffffffc00da2e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm] Sep 23 00:33:20 lynx kernel: [ 965.988882] [<ffffffff810c3d80>] ? wake_atomic_t_function+0x60/0x60 Sep 23 00:33:20 lynx kernel: [ 965.988959] [<ffffffffc0262dca>] intel_atomic_commit+0x43a/0x6f0 [i915] Sep 23 00:33:20 lynx kernel: [ 965.989001] [<ffffffffc00f3977>] ? drm_atomic_add_affected_connectors+0x27/0xf0 [drm] Sep 23 00:33:20 lynx kernel: [ 965.989039] [<ffffffffc00f4007>] drm_atomic_commit+0x37/0x60 [drm] Sep 23 00:33:20 lynx kernel: [ 965.989063] [<ffffffffc01c0e1f>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper] Sep 23 00:33:20 lynx kernel: [ 965.989100] [<ffffffffc00f278a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm] Sep 23 00:33:20 lynx kernel: [ 965.989120] [<ffffffffc01c2ff3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper] Sep 23 00:33:20 lynx kernel: [ 965.989136] [<ffffffffc01c306d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper] Sep 23 00:33:20 lynx kernel: [ 965.989200] [<ffffffffc0277e0a>] intel_fbdev_set_par+0x1a/0x60 [i915] Sep 23 00:33:20 lynx kernel: [ 965.989208] [<ffffffff81474f36>] fb_set_var+0x236/0x460 Sep 23 00:33:20 lynx kernel: [ 965.989216] [<ffffffff810b276c>] ? __enqueue_entity+0x6c/0x70 Sep 23 00:33:20 lynx kernel: [ 965.989220] [<ffffffff810b8337>] ? enqueue_entity+0x3a7/0xc70 Sep 23 00:33:20 lynx kernel: [ 965.989226] [<ffffffff810b366f>] ? select_idle_sibling+0xef/0x120 Sep 23 00:33:20 lynx kernel: [ 965.989233] [<ffffffff8146b22f>] fbcon_blank+0x30f/0x350 Sep 23 00:33:20 lynx kernel: [ 965.989241] [<ffffffff81502573>] do_unblank_screen+0xd3/0x1a0 Sep 23 00:33:20 lynx kernel: [ 965.989247] [<ffffffff814f7bda>] vt_ioctl+0x50a/0x12f0 Sep 23 00:33:20 lynx kernel: [ 965.989253] [<ffffffff81295121>] ? ext4_free_inode+0x251/0x660 Sep 23 00:33:20 lynx kernel: [ 965.989260] [<ffffffff814eb09f>] tty_ioctl+0x35f/0xc40 Sep 23 00:33:20 lynx kernel: [ 965.989267] [<ffffffff810e7ed7>] ? call_rcu_sched+0x17/0x20 Sep 23 00:33:20 lynx kernel: [ 965.989275] [<ffffffff812baa8b>] ? ext4_destroy_inode+0x3b/0xa0 Sep 23 00:33:20 lynx kernel: [ 965.989283] [<ffffffff812503dc>] ? __fsnotify_inode_delete+0x1c/0x20 Sep 23 00:33:20 lynx kernel: [ 965.989291] [<ffffffff81228db8>] ? destroy_inode+0x38/0x60 Sep 23 00:33:20 lynx kernel: [ 965.989295] [<ffffffff81228f0d>] ? evict+0x12d/0x190 Sep 23 00:33:20 lynx kernel: [ 965.989299] [<ffffffff812211ff>] do_vfs_ioctl+0x29f/0x490 Sep 23 00:33:20 lynx kernel: [ 965.989305] [<ffffffff8121db99>] ? do_unlinkat+0xe9/0x2d0 Sep 23 00:33:20 lynx kernel: [ 965.989308] [<ffffffff81221469>] SyS_ioctl+0x79/0x90 Sep 23 00:33:20 lynx kernel: [ 965.989316] [<ffffffff818306f2>] entry_SYSCALL_64_fastpath+0x16/0x71 Sep 23 00:33:20 lynx kernel: [ 965.989320] ---[ end trace 2c391ba1df8f5adb ]--- -- 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/1542939 Title: system freeze after vt switching Status in Linux: Fix Released Status in linux package in Ubuntu: Fix Released Status in linux-lts-xenial package in Ubuntu: Fix Released Status in linux source package in Xenial: Fix Released Status in linux-lts-xenial source package in Xenial: In Progress Status in Fedora: Unknown Bug description: I'm trying to use the ctrl+alt+1 to switch to a terminal - ok, after switching back by ctrl+alt+7 the system freeze ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-3-generic 4.4.0-3.17 ProcVersionSignature: Ubuntu 4.4.0-3.17-generic 4.4.1 Uname: Linux 4.4.0-3-generic x86_64 ApportVersion: 2.19.4-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: stinger 1644 F.... pulseaudio Date: Sun Feb 7 22:27:42 2016 HibernationDevice: RESUME=UUID=888e93f3-1a7d-4bf8-a00d-cea6a759d03a InstallationDate: Installed on 2015-11-12 (87 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151112) Lsusb: Bus 002 Device 003: ID 24ae:2000 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: ASUSTeK Computer Inc. P53E ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-3-generic root=UUID=9ad09333-ac7d-4b10-99a0-1e598daa4753 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-3-generic N/A linux-backports-modules-4.4.0-3-generic N/A linux-firmware 1.155 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/15/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P53E.209 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: P53E 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.:bvrP53E.209:bd03/15/2012:svnASUSTeKComputerInc.:pnP53E:pvr1.0:rvnASUSTeKComputerInc.:rnP53E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: P53E dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. 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