[Bug 71977] [BYT] Modesetting on Dell Venue 8 Pro (Bay Trail) produces garbled output (3.11, 3.12) or blank screen (3.13)

Tue Feb 11 22:52:36 PST 2014

https://bugs.freedesktop.org/show_bug.cgi?id=71977

--- Comment #37 from Adam Williamson <awilliam at redhat.com> ---
Oh, it's not a warn_slowpath_common, doesn't look like, just a warn. Here's the
first untainted one, will attach the complete boot log:

Feb 11 14:46:17 fedlet.happyassassin.net kernel: ------------[ cut here
]------------
Feb 11 14:46:17 fedlet.happyassassin.net kernel: WARNING: CPU: 0 PID: 253 at
drivers/gpu/drm/i915/intel_dp.c:109 intel_dp_max_link_bw.isra.5+0x3f/0x50
[i915]()
Feb 11 14:46:17 fedlet.happyassassin.net kernel: invalid max DP link bw val 0,
using 1.62Gbps
Feb 11 14:46:17 fedlet.happyassassin.net kernel: Modules linked in: mmc_block
i915(+) i2c_algo_bit drm_kms_helper drm i2c_core video sdhci_acpi sdhci
mmc_core usb_storage
Feb 11 14:46:17 fedlet.happyassassin.net kernel: CPU: 0 PID: 253 Comm:
systemd-udevd Not tainted 3.14.0-0.rc2.git1.1.1awb.i686 #1
Feb 11 14:46:17 fedlet.happyassassin.net kernel: Hardware name: DellInc. Venue
8 Pro 5830/09RP78, BIOS A04 12/04/2013
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  c0d679c7 2230178a 00000000
f64979fc c0abbcdb f6497a3c f6497a2c c04514ee
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  f91d7ca0 f6497a5c 000000fd
f91d7abc 0000006d f919241f f919241f f6401300
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  00006257 f6a6d800 f6497a48
c045154e 00000009 f6497a3c f91d7ca0 f6497a5c
Feb 11 14:46:17 fedlet.happyassassin.net kernel: Call Trace:
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0abbcdb>]
dump_stack+0x48/0x60
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04514ee>]
warn_slowpath_common+0x7e/0xa0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f919241f>] ?
intel_dp_max_link_bw.isra.5+0x3f/0x50 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f919241f>] ?
intel_dp_max_link_bw.isra.5+0x3f/0x50 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c045154e>]
warn_slowpath_fmt+0x3e/0x60
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f919241f>]
intel_dp_max_link_bw.isra.5+0x3f/0x50 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f91928fe>]
intel_dp_mode_valid+0x2e/0xd0 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f80f5167>]
drm_helper_probe_single_connector_modes+0x1b7/0x360 [drm_kms_helper]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f80f75e1>]
drm_fb_helper_probe_connector_modes.isra.3+0x41/0x60 [drm_kms_helper]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f80f8515>]
drm_fb_helper_initial_config+0x165/0x490 [drm_kms_helper]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04a902b>] ?
trace_hardirqs_on+0xb/0x10
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f91beafe>]
intel_fbdev_initial_config+0x1e/0x20 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f914ffee>]
i915_driver_load+0xd7e/0xdb0 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0974250>] ?
intel_alloc_coherent+0x120/0x120
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f8c4b60c>]
drm_dev_register+0x6c/0x140 [drm]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f8c4d6ea>]
drm_get_pci_dev+0x8a/0x1e0 [drm]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04a902b>] ?
trace_hardirqs_on+0xb/0x10
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f914c665>]
i915_pci_probe+0x35/0x60 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0753c7f>]
pci_device_probe+0x6f/0xc0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c061d475>] ?
sysfs_create_link+0x25/0x40
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0825260>]
driver_probe_device+0x110/0x380
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0753bd2>] ?
pci_match_device+0xb2/0xc0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0825589>]
__driver_attach+0x79/0x80
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0825510>] ?
__device_attach+0x40/0x40
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c08234e7>]
bus_for_each_dev+0x57/0xa0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0824c8e>]
driver_attach+0x1e/0x20
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0825510>] ?
__device_attach+0x40/0x40
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c08248a7>]
bus_add_driver+0x157/0x230
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0825b69>]
driver_register+0x59/0xe0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c075261a>]
__pci_register_driver+0x4a/0x50
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f8c4d945>]
drm_pci_init+0x105/0x110 [drm]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f85d8000>] ? 0xf85d7fff
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f85d8062>]
i915_init+0x62/0x64 [i915]
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04004a2>]
do_one_initcall+0xd2/0x190
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<f85d8000>] ? 0xf85d7fff
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0442f57>] ?
set_memory_ro+0x37/0x40
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04dd62c>]
load_module+0x1a7c/0x2480
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04d9559>] ?
copy_module_from_fd.isra.46+0x109/0x1a0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c04de1dd>]
SyS_finit_module+0x8d/0xd0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0564af3>] ?
vm_mmap_pgoff+0x93/0xb0
Feb 11 14:46:17 fedlet.happyassassin.net kernel:  [<c0acd70d>]
sysenter_do_call+0x12/0x38
Feb 11 14:46:17 fedlet.happyassassin.net kernel: ---[ end trace
ab0ef9173a974a7f ]---
Feb 11 14:46:17 fedlet.happyassassin.net kernel: ------------[ cut here
]------------

So yeah, it looks like the hotplug reversion is not needed if you add 'e' to
the video= force.

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