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[Adam Skillen <askillen@xxxxxxxxxxxxxxxx>]

I completed the bisect, here is the result:


$ git bisect bad fdbc3b1f639bb2cbfb32c612b2699e0ba373317d
fdbc3b1f639bb2cbfb32c612b2699e0ba373317d is the first bad commit


$ git show
commit fdbc3b1f639bb2cbfb32c612b2699e0ba373317d
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date:   Tue Nov 12 17:10:13 2013 +0200

    drm/i915/dp: set sink to power down mode on dp disable
    
    We used to put the local sink and any downstream sinks to power down
    mode at disable or dpms off using the DPCD SET_POWER register, until
    this was broken by
    
    commit e8cb455876fa8f67c6aba394d0a14b697bf04cc3
    Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
    Date:   Sun Jul 1 13:05:48 2012 +0200
    
        drm/i915/dp: convert to encoder disable/enable
    
    Fix it.
    
    Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
    Reviewed-by: Todd Previte <tprevite@xxxxxxxxx>
    Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index eb8139d..0b2e842 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1774,7 +1774,7 @@ static void intel_disable_dp(struct intel_encoder *encoder)
         * ensure that we have vdd while we switch off the panel. */
        ironlake_edp_panel_vdd_on(intel_dp);
        ironlake_edp_backlight_off(intel_dp);
-       intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
+       intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
        ironlake_edp_panel_off(intel_dp);
 
        /* cpu edp my only be disable _after_ the cpu pipe/plane is disabled. */


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1343543

Title:
  [Dell XPS 15 L502X] X stops responding to input after entering idle
  power saving (screen off)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I recently upgraded from 12.04 to 14.04.  Since the upgrade I have
  been having issues with X freezing after the screen enters power
  saving.  The issue did not occur in 12.04.  If I boot up a raring or
  saucy kernel, the issue does not occur.  The 3.13 trusty, and 3.16
  utopic kernels are affected.  It also occured when I tested the latest
  mainline drm-intel-next and utopic-rc kernels.

  Symptoms:
  After waking the screen from power saving/screensaver, the primary display wakes but X stops responding to input (the mouse cursor can still move, but clicking has no effect).  Secondary display does not wake.

  Frequency/conditions:
  Occurs almost every time the screen enters power saving (possibly DPMS issue?)

  When did you first notice it:
  Immediately after upgrading to 14.04

  I followed the suggestions at this URL and tested a few kernels:
  https://wiki.ubuntu.com/X/Troubleshooting/Freeze

  The issue does NOT occur when running these older kernels:
    linux-image-3.8.0-42-generic (3.8.0-42.62~precise1)
    linux-image-3.11.0-24-generic (3.11.0-24.42~precise1)

  The issue does occur when running these kernels:
    linux-image-3.16.0-997-generic (3.16.0-997.201407120342)
    linux-image-3.16.0-031600rc5-generic (3.16.0-031600rc5.201407131735)
    linux-image-3.16.0-3-generic (3.16.0-3.8)
    linux-image-3.13.0-32-generic (3.13.0-32.56)

  Additional notes:
  I have a hybrid Intel/Nvidia GPU model (Nvidia optimus), however the error
  occurs whether or not I have invoked the discrete Nvidia card.

  I am running the most recent BIOS for my system.

  When running the 3.11 saucy kernel I still see error messages in dmesg
  after entering power saving, however X does not freeze.

  dmesg errors:

  [ 4087.958566] WARNING: CPU: 6 PID: 1331 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_display.c:9237 intel_modeset_check_state+0x62d/0x780 [i915]()
  [ 4087.958571] encoder's hw state doesn't match sw tracking (expected 1, found 0)
  [ 4087.958574] Modules linked in: bbswitch(OF) ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) bnep rfcomm bluetooth binfmt_misc arc4 iwldvm mac80211 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer parport_pc ppdev lp hid_generic uvcvideo usbhid videobuf2_vmalloc videobuf2_memops intel_rapl videobuf2_core x86_pkg_temp_thermal mei_me intel_powerclamp mei videodev hid iwlwifi snd dell_laptop dell_wmi coretemp dcdbas sparse_keymap wmi soundcore kvm_intel cfg80211 kvm parport joydev mac_hid lpc_ich serio_raw dm_crypt ses enclosure usb_storage i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul i2c_algo_bit glue_helper ablk_helper drm_kms_helper cryptd drm psmouse r8169 ahci libahci mii video
  [ 4087.958682] CPU: 6 PID: 1331 Comm: Xorg Tainted: GF       W  O 3.13.0-32-generic #57-Ubuntu
  [ 4087.958686] Hardware name: Dell Inc.          Dell System XPS L502X/0NJT03, BIOS A12 09/07/2012
  [ 4087.958690]  0000000000000009 ffff880220445b68 ffffffff8171bcb4 ffff880220445bb0
  [ 4087.958698]  ffff880220445ba0 ffffffff810676cd ffff880220445c20 0000000000000001
  [ 4087.958705]  ffff88022d517800 ffff88022d517af8 ffff88022ccc2800 ffff880220445c00
  [ 4087.958712] Call Trace:
  [ 4087.958728]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
  [ 4087.958737]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
  [ 4087.958743]  [<ffffffff8106773c>] warn_slowpath_fmt+0x4c/0x50
  [ 4087.958783]  [<ffffffffa017533d>] intel_modeset_check_state+0x62d/0x780 [i915]
  [ 4087.958817]  [<ffffffffa0175525>] intel_set_mode+0x25/0x30 [i915]
  [ 4087.958851]  [<ffffffffa0175dcb>] intel_crtc_set_config+0x7ab/0x9a0 [i915]
  [ 4087.958893]  [<ffffffffa006eebd>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
  [ 4087.958929]  [<ffffffffa0071da7>] drm_mode_setcrtc+0xf7/0x5e0 [drm]
  [ 4087.958956]  [<ffffffffa0062c22>] drm_ioctl+0x502/0x630 [drm]
  [ 4087.958975]  [<ffffffff811cfd10>] do_vfs_ioctl+0x2e0/0x4c0
  [ 4087.958983]  [<ffffffff8109ddf4>] ? vtime_account_user+0x54/0x60
  [ 4087.958992]  [<ffffffff811cff71>] SyS_ioctl+0x81/0xa0
  [ 4087.959002]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6
  [ 4087.959007] ---[ end trace e81d86e8a034e409 ]---
  [ 4087.959048] [drm:intel_pipe_config_compare] *ERROR* mismatch in has_dp_encoder (expected 1, found 0)
  [ 4087.959052] ------------[ cut here ]------------
  [ 4087.959085] WARNING: CPU: 6 PID: 1331 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_display.c:9310 check_crtc_state+0x255/0x340 [i915]()
  [ 4087.959089] pipe state doesn't match!
  [ 4087.959091] Modules linked in: bbswitch(OF) ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) bnep rfcomm bluetooth binfmt_misc arc4 iwldvm mac80211 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer parport_pc ppdev lp hid_generic uvcvideo usbhid videobuf2_vmalloc videobuf2_memops intel_rapl videobuf2_core x86_pkg_temp_thermal mei_me intel_powerclamp mei videodev hid iwlwifi snd dell_laptop dell_wmi coretemp dcdbas sparse_keymap wmi soundcore kvm_intel cfg80211 kvm parport joydev mac_hid lpc_ich serio_raw dm_crypt ses enclosure usb_storage i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul i2c_algo_bit glue_helper ablk_helper drm_kms_helper cryptd drm psmouse r8169 ahci libahci mii video
  [ 4087.959183] CPU: 6 PID: 1331 Comm: Xorg Tainted: GF       W  O 3.13.0-32-generic #57-Ubuntu
  [ 4087.959186] Hardware name: Dell Inc.          Dell System XPS L502X/0NJT03, BIOS A12 09/07/2012
  [ 4087.959189]  0000000000000009 ffff8802204458a8 ffffffff8171bcb4 ffff8802204458f0
  [ 4087.959196]  ffff8802204458e0 ffffffff810676cd ffff8802328ed6e0 ffff880220445970
  [ 4087.959202]  ffff88022d517800 ffff8802328ed000 ffff88022d517b28 ffff880220445940
  [ 4087.959208] Call Trace:
  [ 4087.959217]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
  [ 4087.959224]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
  [ 4087.959230]  [<ffffffff8106773c>] warn_slowpath_fmt+0x4c/0x50
  [ 4087.959263]  [<ffffffffa01660ab>] ? intel_pipe_config_compare+0x60b/0xae0 [i915]
  [ 4087.959293]  [<ffffffffa01678c5>] check_crtc_state+0x255/0x340 [i915]
  [ 4087.959327]  [<ffffffffa0174fcb>] intel_modeset_check_state+0x2bb/0x780 [i915]
  [ 4087.959357]  [<ffffffffa0175525>] intel_set_mode+0x25/0x30 [i915]
  [ 4087.959386]  [<ffffffffa0175dcb>] intel_crtc_set_config+0x7ab/0x9a0 [i915]
  [ 4087.959417]  [<ffffffffa006eebd>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
  [ 4087.959448]  [<ffffffffa0071da7>] drm_mode_setcrtc+0xf7/0x5e0 [drm]
  [ 4087.959472]  [<ffffffffa0062c22>] drm_ioctl+0x502/0x630 [drm]
  [ 4087.959487]  [<ffffffff811cfd10>] do_vfs_ioctl+0x2e0/0x4c0
  [ 4087.959493]  [<ffffffff8109ddf4>] ? vtime_account_user+0x54/0x60
  [ 4087.959501]  [<ffffffff811cff71>] SyS_ioctl+0x81/0xa0
  [ 4087.959509]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6
  [ 4087.959513] ---[ end trace e81d86e8a034e40a ]---
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  adam       2455 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=e4077f94-6164-4268-b130-d6ae6eaa2dea
  InstallationDate: Installed on 2013-12-01 (227 days ago)
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.2)
  MachineType: Dell Inc. Dell System XPS L502X
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-32-generic root=UUID=be640676-3b3e-4da5-950e-0c72e37bd481 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: yes
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-07-05 (12 days ago)
  UserGroups: adm bumblebee cdrom dip fuse lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/07/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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