Bug 62056

Summary: Displayport output suddenly blank; "encoder's hw state doesn't match sw tracking (expected 1, found 0)"
Product: DRI Reporter: Jan Kundrát <jkt>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED NOTOURBUG QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Recent part of the dmesg none

Description Jan Kundrát 2013-03-09 11:43:25 UTC 
Linux 3.8.0, Gentoo amd64, Thinkpad T420s 4171-6SG.
xf86-video-intel from git, commit 63c71bcd96202e6da44d6776d119a82f0c06d386

I've resumed from sleep, switched from LVDS to DP1, used the machine for a while, then run away. After getting back, I found the monitor suspended (as expected), but the machine wouldn't react to any keyboard/mouse events. After a few seconds, it started reacting to capslock, but the DP output was still blank. I tried switching via the Fn+F7, that worked and I was able to get LVDS back. This is what I found in my /var/log/messages:

2013-03-09T11:59:55.825734+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T11:59:55.825743+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987 intel_dp_link_down+0x52/0x16e()
2013-03-09T11:59:55.825765+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T11:59:55.826765+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T11:59:55.826788+01:00 svist kernel: Pid: 165246, comm: kworker/u:3 Not tainted 3.8.0 #1
2013-03-09T11:59:55.826791+01:00 svist kernel: Call Trace:
2013-03-09T11:59:55.826806+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T11:59:55.826811+01:00 svist kernel: [<ffffffff810360cc>] warn_slowpath_null+0x15/0x17
2013-03-09T11:59:55.826814+01:00 svist kernel: [<ffffffff8133deb7>] intel_dp_link_down+0x52/0x16e
2013-03-09T11:59:55.826817+01:00 svist kernel: [<ffffffff81340704>] intel_dp_check_link_status+0x5e/0x150
2013-03-09T11:59:55.826821+01:00 svist kernel: [<ffffffff81340806>] intel_dp_hot_plug+0x10/0x12
2013-03-09T11:59:55.826824+01:00 svist kernel: [<ffffffff81313f1c>] i915_hotplug_work_func+0x64/0x8e
2013-03-09T11:59:55.826827+01:00 svist kernel: [<ffffffff8104d152>] process_one_work+0x1f7/0x33a
2013-03-09T11:59:55.826830+01:00 svist kernel: [<ffffffff81313eb8>] ? i915_error_work_func+0xe6/0xe6
2013-03-09T11:59:55.826833+01:00 svist kernel: [<ffffffff8104d673>] worker_thread+0x208/0x2e2
2013-03-09T11:59:55.826837+01:00 svist kernel: [<ffffffff8104d46b>] ? rescuer_thread+0x1ac/0x1ac
2013-03-09T11:59:55.826840+01:00 svist kernel: [<ffffffff8105172f>] kthread+0xb5/0xbd
2013-03-09T11:59:55.826843+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:55.826846+01:00 svist kernel: [<ffffffff8148a52c>] ret_from_fork+0x7c/0xb0
2013-03-09T11:59:55.826850+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:55.826852+01:00 svist kernel: ---[ end trace ddb161379f2ac077 ]---

[...]

2013-03-09T11:59:58.357774+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T11:59:58.357807+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987 intel_dp_link_down+0x52/0x16e()
2013-03-09T11:59:58.357810+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T11:59:58.357833+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T11:59:58.357838+01:00 svist kernel: Pid: 165017, comm: kworker/u:0 Tainted: G        W    3.8.0 #1
2013-03-09T11:59:58.357842+01:00 svist kernel: Call Trace:
2013-03-09T11:59:58.357848+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T11:59:58.357853+01:00 svist kernel: [<ffffffff810360cc>] warn_slowpath_null+0x15/0x17
2013-03-09T11:59:58.357857+01:00 svist kernel: [<ffffffff8133deb7>] intel_dp_link_down+0x52/0x16e
2013-03-09T11:59:58.357864+01:00 svist kernel: [<ffffffff81340704>] intel_dp_check_link_status+0x5e/0x150
2013-03-09T11:59:58.357894+01:00 svist kernel: [<ffffffff81340806>] intel_dp_hot_plug+0x10/0x12
2013-03-09T11:59:58.357901+01:00 svist kernel: [<ffffffff81313f1c>] i915_hotplug_work_func+0x64/0x8e
2013-03-09T11:59:58.357905+01:00 svist kernel: [<ffffffff8104d152>] process_one_work+0x1f7/0x33a
2013-03-09T11:59:58.357909+01:00 svist kernel: [<ffffffff81313eb8>] ? i915_error_work_func+0xe6/0xe6
2013-03-09T11:59:58.357912+01:00 svist kernel: [<ffffffff8104d673>] worker_thread+0x208/0x2e2
2013-03-09T11:59:58.357916+01:00 svist kernel: [<ffffffff8104d46b>] ? rescuer_thread+0x1ac/0x1ac
2013-03-09T11:59:58.357921+01:00 svist kernel: [<ffffffff8105172f>] kthread+0xb5/0xbd
2013-03-09T11:59:58.357925+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.357928+01:00 svist kernel: [<ffffffff8148a52c>] ret_from_fork+0x7c/0xb0
2013-03-09T11:59:58.357932+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.357935+01:00 svist kernel: ---[ end trace ddb161379f2ac078 ]---
2013-03-09T11:59:58.492706+01:00 svist kernel: thinkpad_acpi: docked into hotplug port replicator
2013-03-09T11:59:58+01:00 svist logger: ACPI event unhandled: ibm/hotkey HKEY 00000080 00004010
2013-03-09T11:59:58.587757+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T11:59:58.587787+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987 intel_dp_link_down+0x52/0x16e()
2013-03-09T11:59:58.587791+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T11:59:58.587813+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T11:59:58.587819+01:00 svist kernel: Pid: 165246, comm: kworker/u:3 Tainted: G        W    3.8.0 #1
2013-03-09T11:59:58.587821+01:00 svist kernel: Call Trace:
2013-03-09T11:59:58.587827+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T11:59:58.587830+01:00 svist kernel: [<ffffffff810360cc>] warn_slowpath_null+0x15/0x17
2013-03-09T11:59:58.587834+01:00 svist kernel: [<ffffffff8133deb7>] intel_dp_link_down+0x52/0x16e
2013-03-09T11:59:58.587837+01:00 svist kernel: [<ffffffff81340704>] intel_dp_check_link_status+0x5e/0x150
2013-03-09T11:59:58.587840+01:00 svist kernel: [<ffffffff81340806>] intel_dp_hot_plug+0x10/0x12
2013-03-09T11:59:58.587843+01:00 svist kernel: [<ffffffff81313f1c>] i915_hotplug_work_func+0x64/0x8e
2013-03-09T11:59:58.587846+01:00 svist kernel: [<ffffffff8104d152>] process_one_work+0x1f7/0x33a
2013-03-09T11:59:58.587850+01:00 svist kernel: [<ffffffff81313eb8>] ? i915_error_work_func+0xe6/0xe6
2013-03-09T11:59:58.587853+01:00 svist kernel: [<ffffffff8104d673>] worker_thread+0x208/0x2e2
2013-03-09T11:59:58.587856+01:00 svist kernel: [<ffffffff8104d46b>] ? rescuer_thread+0x1ac/0x1ac
2013-03-09T11:59:58.587859+01:00 svist kernel: [<ffffffff8105172f>] kthread+0xb5/0xbd
2013-03-09T11:59:58.587862+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.587895+01:00 svist kernel: [<ffffffff8148a52c>] ret_from_fork+0x7c/0xb0
2013-03-09T11:59:58.587899+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.587902+01:00 svist kernel: ---[ end trace ddb161379f2ac079 ]---
2013-03-09T11:59:58.687707+01:00 svist kernel: usb 3-1.5: new high-speed USB device number 83 using ehci-pci
2013-03-09T11:59:58.769757+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T11:59:58.769792+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987 intel_dp_link_down+0x52/0x16e()
2013-03-09T11:59:58.769796+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T11:59:58.769818+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T11:59:58.769823+01:00 svist kernel: Pid: 165017, comm: kworker/u:0 Tainted: G        W    3.8.0 #1
2013-03-09T11:59:58.769826+01:00 svist kernel: Call Trace:
2013-03-09T11:59:58.769833+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T11:59:58.769838+01:00 svist kernel: [<ffffffff810360cc>] warn_slowpath_null+0x15/0x17
2013-03-09T11:59:58.769842+01:00 svist kernel: [<ffffffff8133deb7>] intel_dp_link_down+0x52/0x16e
2013-03-09T11:59:58.769850+01:00 svist kernel: [<ffffffff81340704>] intel_dp_check_link_status+0x5e/0x150
2013-03-09T11:59:58.769881+01:00 svist kernel: [<ffffffff81340806>] intel_dp_hot_plug+0x10/0x12
2013-03-09T11:59:58.769887+01:00 svist kernel: [<ffffffff81313f1c>] i915_hotplug_work_func+0x64/0x8e
2013-03-09T11:59:58.769891+01:00 svist kernel: [<ffffffff8104d152>] process_one_work+0x1f7/0x33a
2013-03-09T11:59:58.769895+01:00 svist kernel: [<ffffffff81313eb8>] ? i915_error_work_func+0xe6/0xe6
2013-03-09T11:59:58.769898+01:00 svist kernel: [<ffffffff8104d673>] worker_thread+0x208/0x2e2
2013-03-09T11:59:58.769901+01:00 svist kernel: [<ffffffff8104d46b>] ? rescuer_thread+0x1ac/0x1ac
2013-03-09T11:59:58.769904+01:00 svist kernel: [<ffffffff8105172f>] kthread+0xb5/0xbd
2013-03-09T11:59:58.769908+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.769912+01:00 svist kernel: [<ffffffff8148a52c>] ret_from_fork+0x7c/0xb0
2013-03-09T11:59:58.769916+01:00 svist kernel: [<ffffffff8105167a>] ? kthread_freezable_should_stop+0x4d/0x4d
2013-03-09T11:59:58.769919+01:00 svist kernel: ---[ end trace ddb161379f2ac07a ]---

[Some USB, AHCI and ACPI events as a result of a dock/undock which I performed in an attempt at making the DisplayPort work again]

2013-03-09T12:00:07.226750+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T12:00:07.226789+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_display.c:7864 intel_modeset_check_state+0x370/0x4f3()
2013-03-09T12:00:07.226795+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T12:00:07.226802+01:00 svist kernel: encoder's hw state doesn't match sw tracking (expected 1, found 0)
2013-03-09T12:00:07.226838+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T12:00:07.226849+01:00 svist kernel: Pid: 4874, comm: X Tainted: G        W    3.8.0 #1
2013-03-09T12:00:07.226853+01:00 svist kernel: Call Trace:
2013-03-09T12:00:07.226862+01:00 svist kernel: [<ffffffff81336100>] ? intel_modeset_check_state+0x293/0x4f3
2013-03-09T12:00:07.226868+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T12:00:07.226874+01:00 svist kernel: [<ffffffff8103614b>] warn_slowpath_fmt+0x41/0x43
2013-03-09T12:00:07.226880+01:00 svist kernel: [<ffffffff813361dd>] intel_modeset_check_state+0x370/0x4f3
2013-03-09T12:00:07.226886+01:00 svist kernel: [<ffffffff81336b67>] intel_set_mode+0x7ae/0x7fc
2013-03-09T12:00:07.226893+01:00 svist kernel: [<ffffffff813371b7>] intel_crtc_set_config+0x602/0x733
2013-03-09T12:00:07.226899+01:00 svist kernel: [<ffffffff8126acd9>] ? snprintf+0x34/0x36
2013-03-09T12:00:07.226905+01:00 svist kernel: [<ffffffff813059d3>] drm_mode_setcrtc+0x438/0x475
2013-03-09T12:00:07.226911+01:00 svist kernel: [<ffffffff812f8e1f>] drm_ioctl+0x2d2/0x399
2013-03-09T12:00:07.226917+01:00 svist kernel: [<ffffffff8130559b>] ? drm_mode_setplane+0x2ec/0x2ec
2013-03-09T12:00:07.226923+01:00 svist kernel: [<ffffffff8111a47f>] ? fsnotify+0x221/0x244
2013-03-09T12:00:07.226928+01:00 svist kernel: [<ffffffff810f745c>] do_vfs_ioctl+0x444/0x485
2013-03-09T12:00:07.226962+01:00 svist kernel: [<ffffffff810f74e4>] sys_ioctl+0x47/0x6b
2013-03-09T12:00:07.226969+01:00 svist kernel: [<ffffffff8148a5d2>] system_call_fastpath+0x16/0x1b
2013-03-09T12:00:07.226975+01:00 svist kernel: ---[ end trace ddb161379f2ac07b ]---
2013-03-09T12:00:08.552719+01:00 svist kernel: ------------[ cut here ]------------
2013-03-09T12:00:08.552749+01:00 svist kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987 intel_dp_link_down+0x52/0x16e()
2013-03-09T12:00:08.552752+01:00 svist kernel: Hardware name: 41716SG
2013-03-09T12:00:08.552775+01:00 svist kernel: Modules linked in: e1000e uvcvideo videobuf2_core videodev videobuf2_vmalloc videobuf2_memops nls_cp437 msr cpufreq_stats ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc rfcomm bnep btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_conexant coretemp arc4 kvm_intel kvm iwldvm mac80211 tpm_tis thinkpad_acpi tpm nvram tpm_bios battery ac joydev snd_hda_intel microcode snd_hda_codec sdhci_pci iwlwifi snd_hwdep sdhci pcspkr i2c_i801 snd_pcm cfg80211 snd_timer mmc_core snd soundcore snd_page_alloc rfkill ehci_pci sha256_generic fuse nfs lockd sunrpc hid_monterey hid_microsoft hid_logitech hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech usbhid xhci_hcd uhci_hcd usb_storage ehci_hcd usbcore usb_common sr_mod cdrom sg ahci libahci libata [last unloaded: e1000e]
2013-03-09T12:00:08.552780+01:00 svist kernel: Pid: 4874, comm: X Tainted: G        W    3.8.0 #1
2013-03-09T12:00:08.552782+01:00 svist kernel: Call Trace:
2013-03-09T12:00:08.552787+01:00 svist kernel: [<ffffffff8103609f>] warn_slowpath_common+0x7e/0x96
2013-03-09T12:00:08.552791+01:00 svist kernel: [<ffffffff810360cc>] warn_slowpath_null+0x15/0x17
2013-03-09T12:00:08.552794+01:00 svist kernel: [<ffffffff8133deb7>] intel_dp_link_down+0x52/0x16e
2013-03-09T12:00:08.552805+01:00 svist kernel: [<ffffffff81340213>] intel_disable_dp+0x43/0x47
2013-03-09T12:00:08.552807+01:00 svist kernel: [<ffffffff8132ffe0>] ironlake_crtc_disable+0x61/0x764
2013-03-09T12:00:08.552808+01:00 svist kernel: [<ffffffff81333af1>] intel_crtc_update_dpms+0x5c/0x6d
2013-03-09T12:00:08.552809+01:00 svist kernel: [<ffffffff81333b7f>] intel_encoder_dpms+0x1e/0x20
2013-03-09T12:00:08.552810+01:00 svist kernel: [<ffffffff81336394>] intel_connector_dpms+0x34/0x59
2013-03-09T12:00:08.552811+01:00 svist kernel: [<ffffffff81306cdf>] drm_mode_obj_set_property_ioctl+0x188/0x21b
2013-03-09T12:00:08.552812+01:00 svist kernel: [<ffffffff81306d9d>] drm_mode_connector_property_set_ioctl+0x2b/0x2d
2013-03-09T12:00:08.552813+01:00 svist kernel: [<ffffffff812f8e1f>] drm_ioctl+0x2d2/0x399
2013-03-09T12:00:08.552814+01:00 svist kernel: [<ffffffff81306d72>] ? drm_mode_obj_set_property_ioctl+0x21b/0x21b
2013-03-09T12:00:08.552815+01:00 svist kernel: [<ffffffff810f745c>] do_vfs_ioctl+0x444/0x485
2013-03-09T12:00:08.552816+01:00 svist kernel: [<ffffffff810f74e4>] sys_ioctl+0x47/0x6b
2013-03-09T12:00:08.552817+01:00 svist kernel: [<ffffffff8148a5d2>] system_call_fastpath+0x16/0x1b
2013-03-09T12:00:08.552818+01:00 svist kernel: ---[ end trace ddb161379f2ac07c ]---
Comment 1 Chris Wilson 2013-03-10 14:55:27 UTC 
We need the full dmesg (/var/log/messages), can you please attach it?
Comment 2 Jan Kundrát 2013-03-10 15:14:05 UTC 
Created attachment 76271 [details]
Recent part of the dmesg

I've discovered that the laptop was not able to detect the external LCD over the DP even after a reboot, a power cycle, a kernel update and several plug-replug cycles of the DP cable; I've also switched the cable to the laptop's own output instead of going through the dock. The DVI output worked, though. In the end, a power cycle of the *monitor* fixed the problem. This might therefore involve some low-level, hardware-specific detail which might make it hard to properly diagnose. Please feel free to close this as a one-time glitch.

The machine has been up for a few days and I'd prefer not to add a ful log of everything. Attached is the log starting on the preceding evening. If you'd like to see the initial boot as well, I can provide it -- just tell me. In the meanwhile, I've upgraded to 3.8.1 and recent xf86-video-intel git.
Comment 3 Daniel Vetter 2013-03-11 18:18:40 UTC 
Yeah, sounds like some bogons hit your monitor. If you don't hit this again in the next few days I think we have to shrug this of and close the bug.

But we have some residual issues with DP and link training, so I'd like to keep an eye on this for a bit and so keep the bug open for a bit longer.
Comment 4 Chris Wilson 2013-06-07 18:29:07 UTC 
Assuming random hw bug.

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