My system started hanging after upgrading to 14.10. The screen freezes, all processes continue to execute, but I couldn't seem to interact with the computer. (For example, if I am in a skype call, I continue hearing the other side, they hear me too, but the screen freezes.)
I noticed that if I wait about 5 minutes after the hang, try to go to tty1, the system eventually wakes up. The following lines appear in dmesg after a wake up:
[77886.653919] ------------[ cut here ]------------
[77886.654002] WARNING: CPU: 0 PID: 3044 at /build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_display.c:3324 intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]()
[77886.654006] Modules linked in: nls_iso8859_1 hid_generic usbhid hid pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nvram rfcomm bnep binfmt_misc dm_crypt uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media btusb bluetooth 6lowpan_iphc arc4 iwldvm mac80211 dell_wmi sparse_keymap dell_laptop dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_conexant crct10dif_pclmul snd_hda_codec_generic crc32_pclmul ghash_clmulni_intel cryptd snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep joydev snd_pcm serio_raw snd_seq_midi snd_seq_midi_event iwlwifi snd_rawmidi snd_seq cfg80211 snd_seq_device snd_timer lpc_ich snd soundcore shpchp mei_me mei dell_smo8800 cuse parport_pc ppdev mac_hid coretemp lp parport
[77886.654084] btrfs xor raid6_pq ums_realtek uas usb_storage i915 i2c_algo_bit atl1c drm_kms_helper drm ahci psmouse libahci wmi video
[77886.654109] CPU: 0 PID: 3044 Comm: Xorg Tainted: G OE 3.16.0-24-generic #32-Ubuntu
[77886.654113] Hardware name: Dell Inc. Dell System Inspiron N411Z/0YWNPW, BIOS A00 06/24/2011
[77886.654117] 0000000000000009 ffff8800c5dbfbf8 ffffffff8177fcbc 0000000000000000
[77886.654123] ffff8800c5dbfc30 ffffffff8106fd8d 0000000000000000 ffff880193d34000
[77886.654129] ffff880035998210 ffff8800d1fbc000 ffff8800d1fbc000 ffff8800c5dbfc40
[77886.654135] Call Trace:
[77886.654151] [<ffffffff8177fcbc>] dump_stack+0x45/0x56
[77886.654161] [<ffffffff8106fd8d>] warn_slowpath_common+0x7d/0xa0
[77886.654169] [<ffffffff8106fe6a>] warn_slowpath_null+0x1a/0x20
[77886.654219] [<ffffffffc0128ffc>] intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]
[77886.654229] [<ffffffff810b9590>] ? prepare_to_wait_event+0x100/0x100
[77886.654274] [<ffffffffc012bac3>] intel_crtc_disable_planes+0x33/0x1c0 [i915]
[77886.654286] [<ffffffff8166e18c>] ? __alloc_skb+0x4c/0x1f0
[77886.654328] [<ffffffffc012c090>] ironlake_crtc_disable+0x50/0x980 [i915]
[77886.654371] [<ffffffffc0078f53>] ? drm_modeset_lock+0x33/0xf0 [drm]
[77886.654379] [<ffffffff81785ab2>] ? mutex_lock+0x12/0x30
[77886.654422] [<ffffffffc012d457>] intel_crtc_update_dpms+0x67/0xa0 [i915]
[77886.654465] [<ffffffffc0131ac9>] intel_connector_dpms+0x59/0x70 [i915]
[77886.654502] [<ffffffffc006fe19>] drm_mode_obj_set_property_ioctl+0x399/0x3a0 [drm]
[77886.654535] [<ffffffffc006fe50>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
[77886.654560] [<ffffffffc005ea4f>] drm_ioctl+0x1df/0x680 [drm]
[77886.654604] [<ffffffffc01064ab>] ? ironlake_irq_postinstall+0x2b/0x1a0 [i915]
[77886.654614] [<ffffffff81414d4c>] ? backlight_generate_event+0x5c/0x80
[77886.654620] [<ffffffff8141559e>] ? brightness_store+0xce/0x100
[77886.654629] [<ffffffff8121f9bc>] ? fsnotify+0x27c/0x350
[77886.654637] [<ffffffff811f4bc8>] do_vfs_ioctl+0x2c8/0x4a0
[77886.654644] [<ffffffff811e31a1>] ? __sb_end_write+0x31/0x60
[77886.654653] [<ffffffff811e0d12>] ? vfs_write+0x1b2/0x1f0
[77886.654659] [<ffffffff811f4e21>] SyS_ioctl+0x81/0xa0
[77886.654666] [<ffffffff81787ced>] system_call_fastpath+0x1a/0x1f
[77886.654672] ---[ end trace c1df01145492c87b ]---
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-24-generic 3.16.0-24.32
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: nasko 4905 F...m pulseaudio
/dev/snd/controlC0: nasko 4905 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Nov 15 17:18:08 2014
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=dea0f836-e744-4167-94ac-c782347eaaae
InstallationDate: Installed on 2011-09-17 (1155 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
MachineType: Dell Inc. Dell System Inspiron N411Z
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=7d37ed15-42a3-4a3d-adc4-6af303326b18 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-24-generic N/A
linux-backports-modules-3.16.0-24-generic N/A
linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: Upgraded to utopic on 2014-09-15 (61 days ago)
dmi.bios.date: 06/24/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A00
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 0YWNPW
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA00:bd06/24/2011:svnDellInc.:pnDellSystemInspironN411Z:pvr:rvnDellInc.:rn0YWNPW:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System Inspiron N411Z
dmi.sys.vendor: Dell Inc.
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