[Nouveau] [Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #8 from Chris Paulson-Ellis <chris at edesix.com> ---
Okay, that was... interesting. I haven't quite managed to pin it down to a
single commit, but here is what I've found out.

I did a manual bisect, only looking at commits that make changes in
drivers/gpu/drm/nouveau. The area of interest had unrelated problems causing a
NULL pointer dereference and a compile problem. I fixed this by cherry picking
the following 2 commits each time I tested a new commit:

dea7e0ac  ttm: fix agp since ttm tt rework
095f979a  drm/nouveau/pm: fix build with HWMON off

With these changes, the last nouveau commit that works is:

d2edab4a  drm/nouveau/pm: fix missing volt changes when boot voltage is
undefined

The next 3 nouveau commits all fail, but with a NULL pointer dereference in
nouveau_hw_load_state() rather than with a black-screen hang:

2a44e499  drm/nouveau/disp: introduce proper init/fini, separate from
create/destroy
cf41d53b  drm/nouveau: re-jig fbcon suspend/resume process a little
1772fcc6  drm/nv50/disp: fix evo for create/init + destroy/fini split

In the next nouveau commit, the NULL pointer dereference has gone and it fails
with the black-screen hang:

f62b27db  drm/nouveau: shutdown display on suspend/hibernate

The stack trace for the 3 commits that oops rather than hang is as follows:

[   51.360006] Call Trace:
[   51.360006]  [<f0c78c69>] ? nv_crtc_restore+0x52/0x10f [nouveau]
[   51.360006]  [<f0cd3215>] ? ch7006_write+0x1f/0x50 [ch7006]
[   51.360006]  [<f0c7a623>] ? nv04_display_init+0x48/0x58 [nouveau]
[   51.360006]  [<f0c3214a>] ? nouveau_display_create+0x211/0x3f2 [nouveau]
[   51.360006]  [<f0c12b16>] ? nouveau_card_init+0x138a/0x1459 [nouveau]
[   51.360006]  [<f0c11744>] ? nouveau_stub_init+0x3/0x3 [nouveau]
[   51.360006]  [<f0c13092>] ? nouveau_load+0x3ce/0x6ad [nouveau]
[   51.360006]  [<f0ade3e0>] ? drm_get_pci_dev+0x13e/0x249 [drm]
[   51.360006]  [<c104580d>] ? __blocking_notifier_call_chain+0x47/0x4f
[   51.360006]  [<c113eb56>] ? pci_device_probe+0x47/0x68
[   51.360006]  [<c11ab567>] ? driver_probe_device+0x4a/0x13a
[   51.360006]  [<c113ea91>] ? pci_match_device+0x8b/0x99
[   51.360006]  [<c11ab6b9>] ? __driver_attach+0x62/0x64
[   51.360006]  [<c11ab657>] ? driver_probe_device+0x13a/0x13a
[   51.360006]  [<c11aaa38>] ? bus_for_each_dev+0x3f/0x63
[   51.360006]  [<c113eac2>] ? pci_dev_put+0xd/0xd
[   51.360006]  [<c11ab329>] ? driver_attach+0x19/0x1e
[   51.360006]  [<c11ab657>] ? driver_probe_device+0x13a/0x13a
[   51.360006]  [<c11ab0a8>] ? bus_add_driver+0x17d/0x24d
[   51.360006]  [<c113eac2>] ? pci_dev_put+0xd/0xd
[   51.360006]  [<c11ab8a9>] ? driver_register+0x57/0xec
[   51.360006]  [<f0ade51c>] ? drm_pci_init+0x31/0xe6 [drm]
[   51.360006]  [<c113ef22>] ? __pci_register_driver+0x31/0x8f
[   51.360006]  [<c1001027>] ? do_one_initcall+0x27/0x150
[   51.360006]  [<c108b650>] ? __vunmap+0xa0/0xd1
[   51.360006]  [<f0cb6000>] ? 0xf0cb5fff
[   51.360006]  [<c1054f97>] ? sys_init_module+0xccc/0x18f2
[   51.360006]  [<c109be00>] ? sys_close+0x66/0xa7
[   51.360006]  [<c127fb10>] ? sysenter_do_call+0x12/0x26
[   51.360006] Code: 00 28 60 00 f6 05 10 83 ca f0 10 0f 85 1e 12 00 00 8b 83
00 02 00 00 8b 50 18 01 ea 89 c8 e8 45 fd 50 d0 8b 83 78 01 00 00 31 c9 <8b> 2c
b8 85 ed 0f 95 c1 83 ff 01 19 ed 81 e5 00 e0 ff ff 81 c5
[   51.360006] EIP: [<f0c227fc>] nouveau_hw_load_state+0x9a5/0x26d9 [nouveau]
SS:ESP 0068:ee665cc4

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