Created attachment 115999 [details] Complete dmesg with drm.debug=0x06 Whenever I plug my Dell U2414H monitor (DisplayPort MST enabled) at my Galago Ultrapro/W740SU (Intel Iris Pro Graphics 5200), I get a display hang and then a kernel crash, causing a reboot. Using latest drm-intel-nightly (4.1-rc4+). My system: Architecture: amd64 DistroRelease: Ubuntu 15.04 MachineType: System76, Inc. Galago UltraPro PackageArchitecture: amd64 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.1.0-994-generic root=UUID=c87bf02e-1fdc-48ca-9392-be946b4de06e ro quiet splash drm.debug=0x06 vt.handoff=7 Uname: Linux evasys 4.1.0-994-generic #201505230305 SMP Sat May 23 02:06:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Enabled drm.debug=0x06, and after a reboot this is what I got in my syslog: [ 61.338854] WARNING: CPU: 0 PID: 103 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:12262 check_encoder_state+0x165/0x380 [i915]() [ 61.338854] active encoder's pipe doesn't match(expected 1, found 0) [ 61.338872] Modules linked in: ctr ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ec_sys binfmt_misc rfcomm bnep dm_crypt uvcvideo videobuf2_vmalloc hid_logitech_hidpp videobuf2_memops videobuf2_core v4l2_common btusb videodev btbcm btintel media snd_usb_audio arc4 bluetooth snd_usbmidi_lib iwldvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi kvm_intel kvm snd_hda_codec_via snd_hda_codec_generic dm_multipath scsi_dh crct10dif_pclmul snd_hda_intel snd_hda_codec crc32_pclmul iwlwifi ghash_clmulni_intel snd_hda_core aesni_intel snd_hwdep snd_pcm aes_x86_64 lrw gf128mul snd_seq_midi glue_helper snd_seq_midi_event ablk_helper [ 61.338885] cryptd snd_rawmidi cfg80211 joydev rtsx_pci_ms snd_seq memstick serio_raw mei_me snd_seq_device mei snd_timer lpc_ich shpchp snd hid_logitech_dj soundcore tpm_infineon mac_hid parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid hid i915 rtsx_pci_sdmmc i2c_algo_bit drm_kms_helper e1000e psmouse drm ahci ptp libahci rtsx_pci pps_core wmi video [ 61.338887] CPU: 0 PID: 103 Comm: kworker/0:2 Not tainted 4.1.0-994-generic #201505230305 [ 61.338887] Hardware name: Notebook W740SU /W740SU , BIOS 4.6.5 09/11/2014 [ 61.338894] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] [ 61.338896] 0000000000002fe6 ffff8804082f7a88 ffffffff817ff6ab 0000000000005698 [ 61.338896] ffff8804082f7ad8 ffff8804082f7ac8 ffffffff8107d0e7 ffff8804082f7ae8 [ 61.338897] ffff880407d16200 ffff88040830bb30 0000000000000001 ffff88040830b800 [ 61.338898] Call Trace: [ 61.338902] [<ffffffff817ff6ab>] dump_stack+0x45/0x57 [ 61.338904] [<ffffffff8107d0e7>] warn_slowpath_common+0x97/0xe0 [ 61.338905] [<ffffffff8107d1e6>] warn_slowpath_fmt+0x46/0x50 [ 61.338919] [<ffffffffc0279805>] check_encoder_state+0x165/0x380 [i915] [ 61.338932] [<ffffffffc0292f65>] intel_modeset_check_state+0x65/0xc0 [i915] [ 61.338944] [<ffffffffc0293118>] intel_crtc_set_config+0x158/0x290 [i915] [ 61.338955] [<ffffffffc00730d6>] drm_mode_set_config_internal+0x66/0x110 [drm] [ 61.338961] [<ffffffffc01bdef8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [ 61.338967] [<ffffffffc01bfa30>] drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x80 [drm_kms_helper] [ 61.338971] [<ffffffffc01bfaa2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] [ 61.338976] [<ffffffffc01bf9ac>] drm_fb_helper_hotplug_event+0xcc/0x120 [drm_kms_helper] [ 61.338989] [<ffffffffc02a1ade>] intel_fbdev_output_poll_changed+0x1e/0x20 [i915] [ 61.338994] [<ffffffffc01b36ab>] drm_kms_helper_hotplug_event+0x2b/0x40 [drm_kms_helper] [ 61.339007] [<ffffffffc02b5ee5>] intel_dp_mst_hotplug+0x15/0x20 [i915] [ 61.339012] [<ffffffffc01b9592>] drm_dp_send_link_address+0xf2/0x210 [drm_kms_helper] [ 61.339017] [<ffffffffc01b973d>] drm_dp_check_and_send_link_address+0x8d/0xa0 [drm_kms_helper] [ 61.339021] [<ffffffffc01b976c>] drm_dp_mst_link_probe_work+0x1c/0x20 [drm_kms_helper] [ 61.339028] [<ffffffff81096414>] process_one_work+0x144/0x490 [ 61.339029] [<ffffffff81096e7e>] worker_thread+0x11e/0x460 [ 61.339031] [<ffffffff81096d60>] ? create_worker+0x1f0/0x1f0 [ 61.339032] [<ffffffff8109ce59>] kthread+0xc9/0xe0 [ 61.339034] [<ffffffff8109cd90>] ? flush_kthread_worker+0x90/0x90 [ 61.339036] [<ffffffff8180c7e2>] ret_from_fork+0x42/0x70 [ 61.339038] [<ffffffff8109cd90>] ? flush_kthread_worker+0x90/0x90 [ 61.339039] ---[ end trace 4ae192082cf55348 ]--- [ 61.339040] [drm:check_encoder_state] [ENCODER:43:DP MST-43] [ 61.339041] [drm:check_encoder_state] [ENCODER:44:DP MST-44] [ 61.339042] [drm:check_encoder_state] [ENCODER:47:TMDS-47] [ 61.339043] [drm:check_crtc_state] [CRTC:20] [ 61.339047] [drm:check_crtc_state] [CRTC:24] [ 61.339051] [drm:check_crtc_state] [CRTC:28] [ 61.339052] [drm:check_shared_dpll_state] WRPLL 1 [ 61.339053] [drm:check_shared_dpll_state] WRPLL 2 [ 61.339054] [drm:intel_crtc_set_config] [CRTC:28] [NOFB] [ 61.339062] [drm:intel_connector_check_state] [CONNECTOR:33:eDP-1] [ 61.339064] [drm:check_encoder_state] [ENCODER:31:DAC-31] [ 61.339065] [drm:check_encoder_state] [ENCODER:32:TMDS-32] [ 61.339066] [drm:check_encoder_state] [ENCODER:40:TMDS-40] [ 61.339067] [drm:check_encoder_state] [ENCODER:42:DP MST-42] Complete log attached.
Created attachment 116000 [details] Null pointer dereference that causes the kernel crash
Created attachment 116001 [details] Null pointer dereference that causes the kernel crash
Might be similar to bug 90430
Kernel crashes while iterating the crtc_list (when setting the crtc_config). (gdb) list *(drm_crtc_index+0x5) 0xfa5 is in drm_crtc_index (/home/rsalveti/projects/kernel/linux-2.6/drivers/gpu/drm/drm_crtc.c:738). 733 unsigned int drm_crtc_index(struct drm_crtc *crtc) 734 { 735 unsigned int index = 0; 736 struct drm_crtc *tmp; 737 738 list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) { 739 if (tmp == crtc) 740 return index; 741 742 index++; One weird thing that I noticed is that the list of modes when using MST is different, when using the same monitor. With MST: [ 57.305582] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:49:DP-2] probed modes : [ 57.305585] [drm:drm_mode_debug_printmodeline] Modeline 60:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 57.305588] [drm:drm_mode_debug_printmodeline] Modeline 58:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 57.305590] [drm:drm_mode_debug_printmodeline] Modeline 57:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5 [ 57.305592] [drm:drm_mode_debug_printmodeline] Modeline 59:"848x480" 60 33750 848 864 976 1088 480 486 494 517 0x40 0x5 [ 57.305594] [drm:drm_mode_debug_printmodeline] Modeline 52:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa Without MST (displayport 1.2 disabled): [ 45.793283] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:41:DP-1] probed modes : [ 45.793285] [drm:drm_mode_debug_printmodeline] Modeline 51:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x48 0x5 [ 45.793287] [drm:drm_mode_debug_printmodeline] Modeline 80:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 [ 45.793288] [drm:drm_mode_debug_printmodeline] Modeline 53:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 45.793290] [drm:drm_mode_debug_printmodeline] Modeline 82:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 45.793291] [drm:drm_mode_debug_printmodeline] Modeline 77:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5 [ 45.793292] [drm:drm_mode_debug_printmodeline] Modeline 76:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15 [ 45.793294] [drm:drm_mode_debug_printmodeline] Modeline 98:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5 [ 45.793296] [drm:drm_mode_debug_printmodeline] Modeline 58:"1600x900" 60 108000 1600 1624 1704 1800 900 901 904 1000 0x40 0x5 [ 45.793297] [drm:drm_mode_debug_printmodeline] Modeline 64:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 45.793299] [drm:drm_mode_debug_printmodeline] Modeline 57:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 45.793300] [drm:drm_mode_debug_printmodeline] Modeline 56:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5 [ 45.793302] [drm:drm_mode_debug_printmodeline] Modeline 54:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 45.793303] [drm:drm_mode_debug_printmodeline] Modeline 83:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 45.793305] [drm:drm_mode_debug_printmodeline] Modeline 79:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5 [ 45.793306] [drm:drm_mode_debug_printmodeline] Modeline 65:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5 [ 45.793308] [drm:drm_mode_debug_printmodeline] Modeline 66:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 45.793309] [drm:drm_mode_debug_printmodeline] Modeline 67:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5 [ 45.793311] [drm:drm_mode_debug_printmodeline] Modeline 60:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 45.793312] [drm:drm_mode_debug_printmodeline] Modeline 78:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa [ 45.793313] [drm:drm_mode_debug_printmodeline] Modeline 84:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa [ 45.793315] [drm:drm_mode_debug_printmodeline] Modeline 55:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa [ 45.793316] [drm:drm_mode_debug_printmodeline] Modeline 61:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa [ 45.793318] [drm:drm_mode_debug_printmodeline] Modeline 62:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa [ 45.793319] [drm:drm_mode_debug_printmodeline] Modeline 75:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa [ 45.793320] [drm:drm_mode_debug_printmodeline] Modeline 63:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6 Monitor works fine when MST is enabled at the bios/boot loader screen (using 1920x1080). It only gets broken after linux boots.
Also, sometimes I can get the monitor to work at 1024x768 for a few seconds, before the crash happens.
I can reproduce this with W740SU + Dell P2415Q. Unfortunately I don't have much time for debugging right now. http://mid.gmane.org/87bnhfl61a.fsf@intel.com
(In reply to Ricardo Salveti de Araujo from comment #2) > Created attachment 116001 [details] > Null pointer dereference that causes the kernel crash I think this oops is probably a different bug, to do with atomic modesetting.
(In reply to Jani Nikula from comment #6) > I can reproduce this with W740SU + Dell P2415Q. Unfortunately I don't have > much time for debugging right now. > > http://mid.gmane.org/87bnhfl61a.fsf@intel.com No longer happens with latest kernels, closing.
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