Bug 18342 - [regression] i915 incorrectly detects bogus LVDS connection instead of LVDS1
Summary: [regression] i915 incorrectly detects bogus LVDS connection instead of LVDS1
Status: CLOSED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri-intel@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks: 16444
  Show dependency tree
 
Reported: 2010-09-12 18:43 UTC by Maciej Rutecki
Modified: 2010-10-03 21:00 UTC (History)
4 users (show)

See Also:
Kernel Version: 2.6.36-rc4
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
Cleanup after failure correctly. (1.29 KB, patch)
2010-09-23 15:18 UTC, Chris Wilson 		Details | Diff
Don't bail for an unsupported command. (1.41 KB, patch)
2010-09-23 15:19 UTC, Chris Wilson 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description Maciej Rutecki 2010-09-12 18:43:34 UTC 
Subject    : [regression] i915 incorrectly detects bogus LVDS connection instead of LVDS1
Submitter  : Woody Suwalski <terraluna977@gmail.com>
Date       : 2010-09-08 15:10
Message-ID : AANLkTim2mrVRCKg-2couMTFV7krHQp0+2e_cbaiT_KYW@mail.gmail.com
References : http://marc.info/?l=linux-kernel&m=128395866331382&w=2

This entry is being used for tracking a regression from 2.6.35. Please don't
close it until the problem is fixed in the mainline.
Comment 1 Woody Suwalski 2010-09-13 16:39:50 UTC 
Problem still present in 2.6.36-rc4
Comment 2 Woody Suwalski 2010-09-22 14:45:05 UTC 
Not fixed in 2.6.36-rc5 nor 2.6.36-rc5-git1

Actually the problem is probably more significant then just incorrect display selection - I am pretty sure that the system is crashed, except there is no way to investigate - no screen and USB kbd seems dead - even NUMLK does not work...
Comment 3 Woody Suwalski 2010-09-22 17:45:22 UTC 
To get more data, I have rebuilt the kernel with DRM in modules.
Once in the ramdisk I have started insmod'ing (by hand) the DRM modules, I have managed to collect a dmsg output as follows:

[  193.760859] [drm] Initialized drm 1.1.0 20060810
[  273.297522] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[  273.297543] i915 0000:00:02.0: setting latency timer to 64
[  273.383280] [drm] set up 7M of stolen space
[  273.688286] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+me
m,decodes=io+mem:owns=io+mem
[  273.688813] [drm] initialized overlay support
[  273.836070] BUG: unable to handle kernel NULL pointer dereference at 0000004c
[  273.836086] IP: [<f831c3a8>] 0xf831c3a8
[  273.836101] *pde = 00000000 
[  273.836111] Oops: 0000 [#1] SMP 
[  273.836120] last sysfs file: 
[  273.836129] Modules linked in: i915(+) drm_kms_helper drm i2c_algo_bit usb_st
orage usb_libusual ohci_hcd uhci_hcd ehci_hcd usbhid usbcore
[  273.836164] 
[  273.836177] Pid: 1190, comm: insmod Not tainted 2.6.36-mini #3 To be filled b
y O.E.M./To be filled by O.E.M.
[  273.836191] EIP: 0060:[<f831c3a8>] EFLAGS: 00010286 CPU: 1
[  273.836202] EAX: 00000000 EBX: 00001000 ECX: 00000000 EDX: 0000000b
[  273.836213] ESI: 00000000 EDI: 0000000b EBP: 00000000 ESP: f688fb5c
[  273.836224]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[  273.836236] Process insmod (pid: 1190, ti=f688e000 task=f70eb7e0 task.ti=f688e000)
[  273.836245] Stack:
[  273.836251]  c013bf3e c030861b f688fb84 f827dd89 c013bf00 f7064000 00000000 0000000b
[  273.836274] <0> 00001000 00000000 00000000 f69ad800 f831c552 00000000 00000001 00000000
[  273.836297] <0> 0b91e27c e0e0e0e0 f8276f68 f69ad800 00001000 00001000 00000000 f69ad800
[  273.836322] Call Trace:
[  273.836333]  [<c013bf3e>] ? 0xc013bf3e
[  273.836343]  [<c030861b>] ? 0xc030861b
[  273.836354]  [<c013bf00>] ? 0xc013bf00
[  273.836364]  [<f831c552>] ? 0xf831c552
[  273.836374]  [<f8276f68>] ? 0xf8276f68
[  273.836384]  [<f831fea2>] ? 0xf831fea2
[  273.836394]  [<c030953b>] ? 0xc030953b
[  273.836404]  [<f827828d>] ? 0xf827828d
[  273.836414]  [<f829dfd8>] ? 0xf829dfd8
[  273.836426]  [<f829c047>] ? 0xf829c047
[  273.836438]  [<c01a7c66>] ? 0xc01a7c66
[  273.836447]  [<c01a7d14>] ? 0xc01a7d14
[  273.836458]  [<f83205e1>] ? 0xf83205e1
[  273.836468]  [<f82fddc2>] ? 0xf82fddc2
[  273.836477]  [<f82fd5f0>] ? 0xf82fd5f0
[  273.836490]  [<f8272f23>] ? 0xf8272f23
[  273.836500]  [<c01f28d3>] ? 0xc01f28d3
[  273.836511]  [<c031e88b>] ? 0xc031e88b
[  273.836521]  [<c031f601>] ? 0xc031f601
[  273.836531]  [<c03924b3>] ? 0xc03924b3
[  273.836540]  [<c01f335e>] ? 0xc01f335e
[  273.836550]  [<c031e946>] ? 0xc031e946
[  273.836560]  [<c0392639>] ? 0xc0392639
[  273.836569]  [<c031f540>] ? 0xc031f540
[  273.836579]  [<c0391dc9>] ? 0xc0391dc9
[  273.836589]  [<c031f540>] ? 0xc031f540
[  273.836598]  [<c0392356>] ? 0xc0392356
[  273.836608]  [<c03925c0>] ? 0xc03925c0
[  273.836617]  [<c03916ff>] ? 0xc03916ff
[  273.836627]  [<c031f540>] ? 0xc031f540
[  273.836637]  [<c039287c>] ? 0xc039287c
[  273.836648]  [<f8338000>] ? 0xf8338000
[  273.836657]  [<c031f82d>] ? 0xc031f82d
[  273.836667]  [<c010112b>] ? 0xc010112b
[  273.836677]  [<c015c68b>] ? 0xc015c68b
[  273.836696]  [<c0478325>] ? 0xc0478325
[  273.836704] Code: 0f 00 83 e0 c0 88 45 0e 83 c4 4c 5b 5e 5f 5d c3 8d 76 00 55 57 89 d7 56 0f b6 d2 53 83 ec 20 89 4c 24 18 8b 6c 24 34 89 54 24 1c <8b> 40 4c 3d 40 11 06 00 0f 84 32 01 00 00 3d 40 11 0e 00 ba 4b 
[  273.836823] EIP: [<f831c3a8>]  SS:ESP 0068:f688fb5c
[  273.836834] CR2: 000000000000004c
[  273.836844] ---[ end trace 443791986a317ac9 ]---


The kernel addresses on stack seem consistent - I have run the experiment twice.
Unfortunately they do not tell me much:
c013bf3e is in "msleep"
c030861b is in "string"

The way I have collected dmesg output may explain the msleep:
insmod i915.ko ; sleep 1 ; dmesg > /mnt/dmesg.log ; umount /mnt

What other useful traces could I collect?
Comment 4 Chris Wilson 2010-09-22 17:59:22 UTC 
Try including debugging symbols when compiling the kernel and enable frame pointers.
Comment 5 Woody Suwalski 2010-09-23 14:44:56 UTC 
OK, rebuilt kernel with framepointer and debugging.
Insmoded drm.ko with debug=255

[   14.537478] kobject: 'i2c_algo_bit' (f832ade8): kobject_add_internal: parent: 'module', set: 'module'
[   14.537518] kobject: 'holders' (f6960380): kobject_add_internal: parent: 'i2c_algo_bit', set: '<NULL>'
[   14.537549] kobject: 'i2c_algo_bit' (f832ade8): kobject_uevent_env
[   14.537574] kobject: 'i2c_algo_bit' (f832ade8): fill_kobj_path: path = '/module/i2c_algo_bit'
[   36.868238] kobject: 'drm' (f841dd48): kobject_add_internal: parent: 'module', set: 'module'
[   36.868281] kobject: 'holders' (f69602c0): kobject_add_internal: parent: 'drm', set: '<NULL>'
[   36.868317] kobject: 'drm' (f841dd48): kobject_uevent_env
[   36.868346] kobject: 'drm' (f841dd48): fill_kobj_path: path = '/module/drm'
[   36.868784] kobject: 'drm' (f69ac20c): kobject_add_internal: parent: 'class', set: 'class'
[   36.868814] kobject: 'drm' (f69ac20c): kobject_uevent_env
[   36.868836] kobject: 'drm' (f69ac20c): fill_kobj_path: path = '/class/drm'
[   36.869037] [drm] Initialized drm 1.1.0 20060810
[   50.546226] kobject: 'drm_kms_helper' (f844c848): kobject_add_internal: parent: 'module', set: 'module'
[   50.546267] kobject: 'holders' (f6960140): kobject_add_internal: parent: 'drm_kms_helper', set: '<NULL>'
[   50.546307] kobject: 'drm_kms_helper' (f844c848): kobject_uevent_env
[   50.546332] kobject: 'drm_kms_helper' (f844c848): fill_kobj_path: path = '/module/drm_kms_helper'
[  108.862990] kobject: 'i915' (f85db648): kobject_add_internal: parent: 'module', set: 'module'
[  108.863037] kobject: 'holders' (f69354c0): kobject_add_internal: parent: 'i915', set: '<NULL>'
[  108.863096] kobject: 'i915' (f85db648): kobject_uevent_env
[  108.863126] kobject: 'i915' (f85db648): fill_kobj_path: path = '/module/i915'
[  108.863663] [drm:drm_init], 
[  108.863692] kobject: 'i915' (f68bc0c0): kobject_add_internal: parent: 'drivers', set: 'drivers'
[  108.863739] [drm:drm_get_pci_dev], 
[  108.863788] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[  108.863806] i915 0000:00:02.0: setting latency timer to 64
[  108.868158] [drm:drm_get_minor], 
[  108.868385] kobject: 'drm' (f6935580): kobject_add_internal: parent: '0000:00:02.0', set: '(null)'
[  108.868419] kobject: 'controlD64' (f6945214): kobject_add_internal: parent: 'drm', set: 'devices'
[  108.868791] kobject: 'controlD64' (f6945214): kobject_uevent_env
[  108.868821] kobject: 'controlD64' (f6945214): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/controlD64'
[  108.869102] [drm:drm_get_minor], new minor assigned 64
[  108.869118] [drm:drm_get_minor], 
[  108.869325] kobject: 'card0' (f6945414): kobject_add_internal: parent: 'drm', set: 'devices'
[  108.869591] kobject: 'card0' (f6945414): kobject_uevent_env
[  108.869618] kobject: 'card0' (f6945414): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/card0'
[  108.869835] [drm:drm_get_minor], new minor assigned 0
[  108.947540] [drm:i915_init_phys_hws], Enabled hardware status page
[  108.947575] [drm] set up 7M of stolen space
[  108.947832] [drm:drm_agp_bind_pages], 
[  108.948186] [drm:parse_general_definitions], crt_ddc_bus_pin: 2
[  108.948211] [drm:parse_lfp_panel_data], Found panel mode in BIOS VBT tables:
[  108.948224] [drm:drm_mode_debug_printmodeline], Modeline 0:"840x1050" 0 59600 840 840 840 920 1050 1050 1050 1080 0x8 0xa
[  108.948289] [drm:parse_sdvo_device_mapping], the SDVO device with slave addr 70 is found on SDVOB port
[  108.948343] [drm:intel_modeset_init], 2 display pipes available.
[  108.948372] [drm:intel_crtc_init], swapping pipes & planes for FBC
[  108.948398] [drm:intel_crtc_init], swapping pipes & planes for FBC
[  108.948423] [drm:intel_lvds_init], LVDS is not present in VBT
[  108.948471] kobject: 'i2c-0' (f6945844): kobject_add_internal: parent: '0000:00:02.0', set: 'devices'
[  108.948532] kobject: 'i2c-0' (f6945844): kobject_uevent_env
[  108.948557] kobject: 'i2c-0' (f6945844): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-0'
[  108.948873] [drm:drm_sysfs_connector_add], adding "VGA-1" to sysfs
[  108.948899] kobject: 'card0-VGA-1' (f699840c): kobject_add_internal: parent: 'card0', set: 'devices'
[  108.948939] kobject: 'card0-VGA-1' (f699840c): kobject_uevent_env
[  108.948964] kobject: 'card0-VGA-1' (f699840c): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1'
[  108.949150] [drm:drm_sysfs_hotplug_event], generating hotplug event
[  108.949165] kobject: 'card0' (f6945414): kobject_uevent_env
[  108.949189] kobject: 'card0' (f6945414): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/card0'
[  108.949359] [drm:intel_setup_outputs], probing SDVOB
[  108.949393] kobject: 'i2c-1' (f6945a44): kobject_add_internal: parent: '0000:00:02.0', set: 'devices'
[  108.949438] kobject: 'i2c-1' (f6945a44): kobject_uevent_env
[  108.949461] kobject: 'i2c-1' (f6945a44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-1'
[  109.195090] kobject: 'i2c-2' (f6926e44): kobject_add_internal: parent: '0000:00:02.0', set: 'devices'
[  109.195146] kobject: 'i2c-2' (f6926e44): kobject_uevent_env
[  109.195170] kobject: 'i2c-2' (f6926e44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-2'
[  109.195457] kobject: 'i2c-3' (f6926c44): kobject_add_internal: parent: '0000:00:02.0', set: 'devices'
[  109.195501] kobject: 'i2c-3' (f6926c44): kobject_uevent_env
[  109.195525] kobject: 'i2c-3' (f6926c44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-3'
[  109.195787] [drm:intel_sdvo_debug_write], SDVOB: W: 02                         (SDVO_CMD_GET_DEVICE_CAPS)
[  109.233258] [drm:intel_sdvo_debug_response], SDVOB: R: 02 41 01 01 01 5D 40 00 (Success)
[  109.233300] [drm:drm_sysfs_connector_add], adding "LVDS-1" to sysfs
[  109.233326] kobject: 'card0-LVDS-1' (f69ae80c): kobject_add_internal: parent: 'card0', set: 'devices'
[  109.233367] kobject: 'card0-LVDS-1' (f69ae80c): kobject_uevent_env
[  109.233392] kobject: 'card0-LVDS-1' (f69ae80c): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1'
[  109.233581] [drm:drm_sysfs_hotplug_event], generating hotplug event
[  109.233596] kobject: 'card0' (f6945414): kobject_uevent_env
[  109.233620] kobject: 'card0' (f6945414): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/drm/card0'
[  109.233788] [drm:intel_sdvo_debug_write], SDVOB: W: 84                         (SDVO_CMD_GET_SUPPORTED_ENHANCEMENTS)
[  109.248280] [drm:intel_sdvo_debug_response], SDVOB: R: 00 00                   (Not supported)
[  109.248310] [drm:intel_sdvo_init], SDVO output failed to setup on SDVOB
[  109.248358] kobject: 'i2c-3' (f6926c44): kobject_uevent_env
[  109.248382] kobject: 'i2c-3' (f6926c44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-3'
[  109.248552] kobject: 'i2c-3' (f6926c44): kobject_cleanup
[  109.248566] kobject: 'i2c-3' (f6926c44): calling ktype release
[  109.248576] kobject: 'i2c-3': free name
[  109.248611] kobject: 'i2c-2' (f6926e44): kobject_uevent_env
[  109.248635] kobject: 'i2c-2' (f6926e44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-2'
[  109.248802] kobject: 'i2c-2' (f6926e44): kobject_cleanup
[  109.248815] kobject: 'i2c-2' (f6926e44): calling ktype release
[  109.248825] kobject: 'i2c-2': free name
[  109.248858] kobject: 'i2c-1' (f6945a44): kobject_uevent_env
[  109.248882] kobject: 'i2c-1' (f6945a44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-1'
[  109.249045] kobject: 'i2c-1' (f6945a44): kobject_cleanup
[  109.249058] kobject: 'i2c-1' (f6945a44): calling ktype release
[  109.249068] kobject: 'i2c-1': free name
[  109.249080] [drm:intel_setup_outputs], probing SDVOC
[  109.249107] kobject: 'i2c-1' (f6945a44): kobject_add_internal: parent: '0000:00:02.0', set: 'devices'
[  109.249153] kobject: 'i2c-1' (f6945a44): kobject_uevent_env
[  109.249177] kobject: 'i2c-1' (f6945a44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-1'
[  109.253877] [drm:intel_sdvo_read_byte], i2c transfer returned -6
[  109.253892] [drm:intel_sdvo_init], No SDVO device found on SDVOC
[  109.253929] kobject: 'i2c-1' (f6945a44): kobject_uevent_env
[  109.253953] kobject: 'i2c-1' (f6945a44): fill_kobj_path: path = '/devices/pci0000:00/0000:00:02.0/i2c-1'
[  109.254131] kobject: 'i2c-1' (f6945a44): kobject_cleanup
[  109.254144] kobject: 'i2c-1' (f6945a44): calling ktype release
[  109.254154] kobject: 'i2c-1': free name
[  109.254169] [drm:intel_tv_init], Integrated TV is not present.
[  109.254193] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[  109.254720] [drm] initialized overlay support
[  109.254733] [drm:drm_irq_install], irq=16
[  109.254775] [drm:i915_get_vblank_counter], trying to get vblank count for disabled pipe 0
[  109.374179] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:5:VGA-1]
[  109.388103] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:5:VGA-1] disconnected
[  109.388123] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:8:LVDS-1]
[  109.388148] BUG: unable to handle kernel NULL pointer dereference at 0000004c
[  109.388162] IP: [<f85c1ea4>] 0xf85c1ea4
[  109.388176] *pde = 00000000 
[  109.388186] Oops: 0000 [#1] SMP 
[  109.388196] last sysfs file: 
[  109.388205] Modules linked in: i915(+) drm_kms_helper drm i2c_algo_bit ohci_hcd uhci_hcd ehci_hcd usbhid usbcore
[  109.388237] 
[  109.388250] Pid: 1151, comm: insmod Not tainted 2.6.36-mini #4 To be filled by O.E.M./To be filled by O.E.M.
[  109.388265] EIP: 0060:[<f85c1ea4>] EFLAGS: 00010282 CPU: 1
[  109.388277] EAX: 00000000 EBX: 00001000 ECX: 00000000 EDX: 0000000b
[  109.388288] ESI: 00000000 EDI: 0000000b EBP: f70dbac4 ESP: f70dba98
[  109.388301]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[  109.388314] Process insmod (pid: 1151, ti=f70da000 task=f70eaa60 task.ti=f70da000)
[  109.388323] Stack:
[  109.388329]  00000000 c05eeea0 c05eeeb5 f70dbb18 00000246 f70dbb44 00000000 0000000b
[  109.388353] <0> 00001000 00000000 00000000 f70dbafc f85c2051 00000000 f6998a7c e0e0e0e0
[  109.388378] <0> 00000000 0b40ed67 00000007 f69ae800 00001000 f69ae800 00001000 00000000
[  109.388404] Call Trace:
[  109.388419]  [<f85c2051>] ? 0xf85c2051
[  109.388430]  [<f85c5855>] ? 0xf85c5855
[  109.388442]  [<f8408caa>] ? 0xf8408caa
[  109.388452]  [<f844b031>] ? 0xf844b031
[  109.388465]  [<f8448e06>] ? 0xf8448e06
[  109.388477]  [<c01aa127>] ? 0xc01aa127
[  109.388487]  [<c01aa1c7>] ? 0xc01aa1c7
[  109.388498]  [<f85c5faf>] ? 0xf85c5faf
[  109.388509]  [<f85a3d82>] ? 0xf85a3d82
[  109.388519]  [<f85a35e0>] ? 0xf85a35e0
[  109.388533]  [<f840ac81>] ? 0xf840ac81
[  109.388545]  [<f85cd9c8>] ? 0xf85cd9c8
[  109.388555]  [<c031ba2e>] ? 0xc031ba2e
[  109.388566]  [<c031c780>] ? 0xc031c780
[  109.388577]  [<c0391a26>] ? 0xc0391a26
[  109.388587]  [<c031bbb6>] ? 0xc031bbb6
[  109.388598]  [<c0391cb9>] ? 0xc0391cb9
[  109.388608]  [<c03911c3>] ? 0xc03911c3
[  109.388619]  [<c031c6c0>] ? 0xc031c6c0
[  109.388629]  [<c0391809>] ? 0xc0391809
[  109.388639]  [<c0391c40>] ? 0xc0391c40
[  109.388649]  [<c0390ac7>] ? 0xc0390ac7
[  109.388660]  [<c031c6c0>] ? 0xc031c6c0
[  109.388670]  [<c0391f09>] ? 0xc0391f09
[  109.388681]  [<f85de000>] ? 0xf85de000
[  109.388691]  [<c031c9b0>] ? 0xc031c9b0
[  109.388702]  [<f85de000>] ? 0xf85de000
[  109.388712]  [<f840ae35>] ? 0xf840ae35
[  109.388723]  [<f85de000>] ? 0xf85de000
[  109.388733]  [<f84044ff>] ? 0xf84044ff
[  109.388744]  [<f85de06a>] ? 0xf85de06a
[  109.388754]  [<c010112b>] ? 0xc010112b
[  109.388766]  [<c015eef5>] ? 0xc015eef5
[  109.388786]  [<c047a2b5>] ? 0xc047a2b5
[  109.388794] Code: 0f 00 83 e0 c0 88 47 0e 83 c4 60 5b 5e 5f 5d c3 8d b4 26 00 00 00 00 55 89 e5 57 89 d7 56 0f b6 d2 53 83 ec 20 89 4d ec 89 55 f0 <8b> 40 4c 3d 40 11 06 00 0f 84 36 01 00 00 3d 40 11 0e 00 ba cb 
[  109.388922] EIP: [<f85c1ea4>]  SS:ESP 0068:f70dba98
[  109.388934] CR2: 000000000000004c
[  109.388945] ---[ end trace 013b02ae31ef17dd ]---
[  109.389749] [drm:i915_driver_irq_handler], pipe a underrun
[  109.389762] [drm:i915_driver_irq_handler], pipe b underrun


Unfortunately I am not sure if I will be able to access the hardware anymore as I am moving to a different job...
Comment 6 Chris Wilson 2010-09-23 15:17:44 UTC 
Thanks for the drm.debug dmesg, it showed exactly where the problem was.
Comment 7 Chris Wilson 2010-09-23 15:18:22 UTC 
Created attachment 31092 [details]
Cleanup after failure correctly.
Comment 8 Chris Wilson 2010-09-23 15:19:21 UTC 
Created attachment 31102 [details]
Don't bail for an unsupported command.

The first corrects the error path not to trigger the OOPS. The second patch should restore your LVDS connection.
Comment 9 Woody Suwalski 2010-09-23 16:00:03 UTC 
I have built a kernel with both patches, boots OK.
Please add it to the 2.6.36 release...
Comment 10 Chris Wilson 2010-09-23 16:11:45 UTC 
Included in drm-intel-fixes, soon to be featured in a pull request.
Comment 11 Chris Wilson 2010-09-27 23:22:23 UTC 
Available from linus/master.
Comment 12 Woody Suwalski 2010-09-30 16:23:48 UTC 
Fix is present in 2.6.36-rc6
Tested on the actual hardware...
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