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.
I'm sometimes getting "vblank wait timed out on crtc 0" when switching between X and console on my ThinkPad T420.
Steps to reproduce:
1. get a machine with sandybridge and optimus
2. boot it with some 4.4-rc kernel
3. power off nvidia using bbswitch (couldn't reproduce without this)
4. switch between X and console a few times
(while :; do chvt 10; sleep 2; chvt 1; sleep 2; done)
5. this happens:
------------[ cut here ]------------ gpu/drm/ drm_irq. c:1216 drm_wait_ one_vblank+ 0x1b0/0x1c0( ) masquerade_ ipv4 videobuf2_vmalloc btrtl xt_addrtype videobuf2_memops videobuf2_v4l2 btbcm iptable_nat arc4 nf_conntrack_ipv4 btintel videobuf2_core iwldvm bluetooth nf_defrag_ipv4 nf_nat_ipv4 v4l2_common nf_nat videodev mac80211 iptable_filter ip_tables x_tables x86_pkg_ temp_thermal kvm_intel kvm iwlwifi snd_hda_ codec_conexant snd_hda_ codec_generic snd_hda_intel snd_hda_codec cfg80211 irqbypass crc32_pclmul snd_hwdep crc32c_intel sdhci_pci snd_hda_core sdhci snd_pcm_oss aesni_intel mmc_core aes_x86_64 lrw hdaps(O) thinkpad_ec(O) glue_helper psmouse ablk_helper snd_mixer_oss cryptd snd_pcm serio_raw e1000e thinkpad_acpi ehci_pci snd_timer nvram ehci_hcd wmi usbcore ptp snd pps_core tpm_rng tpm_tis tpm battery bbswitch(O) nf_conntrack_ netlink soundcore ac i2c_i801 usb_common nfnetlink evdev nf_conntrack_sip nf_conntrack_ proto_sctp nf_conntrack_pptp nf_conntrack_ proto_gre nf_conntrack_ netbios_ ns nf_conntrack_ broadcast nf_conntrack_h323 nf_conntrack_irc nf_conntrack_ftp nf_conntrack coretemp hwmon ecryptfs loop dm_crypt lis64-bisect+ #13 1fcc>] dump_stack+ 0x4e/0x82 a062>] warn_slowpath_ common+ 0x82/0xc0 a0fc>] warn_slowpath_ fmt+0x5c/ 0x80 3d0e>] ? _raw_spin_ unlock_ irqrestore+ 0xe/0x10 5765>] ? finish_ wait+0x55/ 0x70 7730>] drm_wait_ one_vblank+ 0x1b0/0x1c0 5bf0>] ? wake_atomic_ t_function+ 0x60/0x60 d302>] intel_atomic_ commit+ 0x732/0x1890 017e>] ? drm_atomic_ check_only+ 0x18e/0x590 ff27>] ? drm_atomic_ add_affected_ connectors+ 0x27/0xf0 05b7>] drm_atomic_ commit+ 0x37/0x60 d76f>] restore_ fbdev_mode+ 0x22f/0x260 fac3>] drm_fb_ helper_ restore_ fbdev_mode_ unlocked+ 0x33/0x80 fb3d>] drm_fb_ helper_ set_par+ 0x2d/0x50 45ca>] intel_fbdev_ set_par+ 0x1a/0x60 5ae1>] ? fb_set_ var+0x301/ 0x450 5a28>] fb_set_var...
WARNING: CPU: 0 PID: 1382 at drivers/
vblank wait timed out on crtc 0
Modules linked in: ccm br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c dm_bufio binfmt_misc tun bnep nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ip6table_filter ip6_tables xt_multiport xt_conntrack iptable_raw uvcvideo xt_TCPMSS xt_tcpudp iptable_mangle btusb ipt_MASQUERADE nf_nat_
CPU: 0 PID: 1382 Comm: Xorg Tainted: G O 4.4.0-rc2-
Hardware name: LENOVO 4178A3G/4178A3G, BIOS 83ET76WW (1.46 ) 07/05/2013
0000000000000000 0000000061618deb ffff88041fc0b790 ffffffff8f301fcc
ffff88041fc0b7d8 ffff88041fc0b7c8 ffffffff8f05a062 ffff88042ad01000
0000000000000000 0000000000000000 0000000000000f58 ffff88042b485a08
Call Trace:
[<ffffffff8f30
[<ffffffff8f05
[<ffffffff8f05
[<ffffffff8f70
[<ffffffff8f09
[<ffffffff8f42
[<ffffffff8f09
[<ffffffff8f4b
[<ffffffff8f44
[<ffffffff8f43
[<ffffffff8f44
[<ffffffff8f41
[<ffffffff8f41
[<ffffffff8f41
[<ffffffff8f4d
[<ffffffff8f36
[<ffffffff8f36