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[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1455575

Title:
  vivid master-next kernel: intel driver fails at startup on Dell Inc.
  Inspiron 1545

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I built 3.19.0-18 from master-next (commit ccb645c) and my Dell 1545
  boots, but X doesn't run. I was able to SSH to the machine and find
  this in dmesg output:

  [   18.128077] ------------[ cut here ]------------
  [   18.128117] kernel BUG at /home/aaron/work/kernel/build/drivers/gpu/drm/i915/intel_display.c:11705!
  [   18.128163] invalid opcode: 0000 [#1] SMP 
  [   18.128197] Modules linked in: arc4 b43 dell_wmi uvcvideo bcma gpio_ich sparse_keymap mac80211 dell_laptop dcdbas i8k snd_hda_codec_idt snd_hda_codec_generic cfg80211 videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common i915 videodev snd_hda_intel media coretemp snd_hda_controller joydev snd_hda_codec serio_raw snd_hwdep snd_pcm snd_seq_midi lpc_ich drm_kms_helper snd_seq_midi_event drm snd_rawmidi snd_seq snd_seq_device snd_timer shpchp snd i2c_algo_bit soundcore wmi mac_hid video cuse parport_pc ppdev lp parport autofs4 hid_generic usbhid hid ums_realtek uas usb_storage psmouse ahci sky2 libahci ssb
  [   18.128735] CPU: 1 PID: 272 Comm: plymouthd Not tainted 3.19.0-18-generic #18
  [   18.128771] Hardware name: Dell Inc. Inspiron 1545                   /0G848F, BIOS A13 10/23/2009
  [   18.128814] task: ffff8800d7dbebf0 ti: ffff88011a2f8000 task.ti: ffff88011a2f8000
  [   18.128851] RIP: 0010:[<ffffffffc04d1fa8>]  [<ffffffffc04d1fa8>] intel_primary_plane_disable+0xe8/0xf0 [i915]
  [   18.128933] RSP: 0018:ffff88011a2fbb78  EFLAGS: 00010246
  [   18.128963] RAX: ffffffffc051df40 RBX: ffff8800d6713b90 RCX: ffff8800d7ef0000
  [   18.128999] RDX: 0000000080000000 RSI: 0000000000000297 RDI: ffff8800366c5c00
  [   18.129034] RBP: ffff88011a2fbb98 R08: 0000000000000001 R09: ffff88011a2fbb0c
  [   18.129069] R10: 0000000000000297 R11: 0000000000001e85 R12: ffff8800d6713800
  [   18.129104] R13: 0000000000000000 R14: ffff8800d6713800 R15: ffff880119c02000
  [   18.129140] FS:  00007f1c049b2740(0000) GS:ffff88011fd00000(0000) knlGS:0000000000000000
  [   18.129184] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   18.129213] CR2: 00007f68e43c7000 CR3: 000000011a2f5000 CR4: 00000000000407e0
  [   18.129248] Stack:
  [   18.129263]  0000000000000002 ffff8800d6713b90 0000000000000002 0000000000000001
  [   18.129318]  ffff88011a2fbc78 ffffffffc04d52ff 0000031600000308 0000000000000000
  [   18.129373]  0000003c00000000 ffff880119c01000 ffff8800d6713b60 ffffffffffffffea
  [   18.129428] Call Trace:
  [   18.129465]  [<ffffffffc04d52ff>] __intel_set_mode+0x8df/0xb70 [i915]
  [   18.129518]  [<ffffffffc04dbf4b>] intel_crtc_set_config+0xc0b/0xfe0 [i915]
  [   18.129574]  [<ffffffffc0352ac6>] drm_mode_set_config_internal+0x66/0x100 [drm]
  [   18.129618]  [<ffffffffc03c3298>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
  [   18.129661]  [<ffffffffc03c5309>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
  [   18.129730]  [<ffffffffc04e947e>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
  [   18.129788]  [<ffffffffc050e28e>] i915_driver_lastclose+0xe/0x20 [i915]
  [   18.129830]  [<ffffffffc0345cde>] drm_lastclose+0x2e/0x150 [drm]
  [   18.129872]  [<ffffffffc0346130>] drm_release+0x330/0x520 [drm]
  [   18.129906]  [<ffffffff811f6617>] __fput+0xe7/0x250
  [   18.129933]  [<ffffffff811f67ce>] ____fput+0xe/0x10
  [   18.129961]  [<ffffffff81093e27>] task_work_run+0xb7/0xf0
  [   18.129992]  [<ffffffff81014ff7>] do_notify_resume+0x97/0xb0
  [   18.130026]  [<ffffffff817cb16f>] int_signal+0x12/0x17
  [   18.130055] Code: 00 00 48 8b 3b 48 8d b3 88 00 00 00 e8 a2 e1 ff ff e9 69 ff ff ff 0f 1f 44 00 00 31 ff eb aa 0f 1f 40 00 31 ff eb 88 0f 1f 40 00 <0f> 0b 66 0f 1f 44 00 00 66 66 66 66 90 55 41 01 c9 48 89 e5 41 
  [   18.130438] RIP  [<ffffffffc04d1fa8>] intel_primary_plane_disable+0xe8/0xf0 [i915]
  [   18.130502]  RSP <ffff88011a2fbb78>
  [   18.130523] ---[ end trace 7037451fb494950a ]---

  The machine works fine with 3.19.0-16, which I built with one extra
  commit for bug 1448942. Since that fix has since been merged in
  master-next I was trying to test a newer kernel to see when I can get
  back out of the business of building my own. My first try failed due
  to a hang that was later fixed by commit 1ece1db,  and my second try
  left me here.

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