[Bug 80274] [BSW]eDP unable to light up after loading i915 driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80274

--- Comment #6 from Guo Jinxian <jinxianx.guo at intel.com> ---
This bug still able to reproduce on latest
-nightly(089bea2664988de48fccc81407ebe12115156731) while running test
igt/kms_cursor_crc/cursor-128-offscreen

root at x-bsw01 tests]# ./kms_cursor_crc --run-subtest cursor-128-offscreen
IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_089bea_20140725_debug+ x86_64)
Beginning cursor-128-offscreen on pipe C, connector HDMI-A-3
....................................................
cursor-128-offscreen on pipe C, connector HDMI-A-3: PASSED

Subtest cursor-128-offscreen: SUCCESS

<4>[  232.558222] WARNING: CPU: 3 PID: 3855 at
drivers/gpu/drm/i915/intel_pm.c:6171 vlv_power_well_enabled+0x7b/0xa8 [i915]()
<4>[  232.558227] Modules linked in: ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel serio_raw pcspkr
snd_hda_controller snd_hda_codec snd_hwdep r8169 snd_pcm snd_timer snd
soundcore battery ac i915 button video drm_kms_helper drm option usb_wwan
usbserial
<4>[  232.558317] CPU: 3 PID: 3855 Comm: kms_cursor_crc Tainted: G        W    
3.16.0-rc6_drm-intel-nightly_089bea_20140725_debug+ #790
<4>[  232.558667]  [<ffffffffa00ea0f8>]
drm_helper_probe_single_connector_modes_merge_bits+0x158/0x2f9 [drm_kms_helper]
<4>[  232.558693]  [<ffffffffa00ea2be>]
drm_helper_probe_single_connector_modes+0x13/0x15 [drm_kms_helper]
<4>[  232.558733]  [<ffffffffa009fe52>] drm_mode_getconnector+0xf7/0x3e8 [drm]
<4>[  232.558762]  [<ffffffffa0093223>] drm_ioctl+0x2bd/0x425 [drm]
<4>[  232.558792]  [<ffffffffa009fd5b>] ? drm_mode_getcrtc+0xc1/0xc1 [drm]
<4>[  232.591059] WARNING: CPU: 3 PID: 3855 at
drivers/gpu/drm/i915/intel_pm.c:6171 vlv_power_well_enabled+0x7b/0xa8 [i915]()
<4>[  232.591064] Modules linked in: ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel serio_raw pcspkr
snd_hda_controller snd_hda_codec snd_hwdep r8169 snd_pcm snd_timer snd
soundcore battery ac i915 button video drm_kms_helper drm option usb_wwan
usbserial
<4>[  232.591145] CPU: 3 PID: 3855 Comm: kms_cursor_crc Tainted: G        W    
3.16.0-rc6_drm-intel-nightly_089bea_20140725_debug+ #790
<4>[  232.591434]  [<ffffffffa00ea0f8>]
drm_helper_probe_single_connector_modes_merge_bits+0x158/0x2f9 [drm_kms_helper]
<4>[  232.591450]  [<ffffffffa00ea2be>]
drm_helper_probe_single_connector_modes+0x13/0x15 [drm_kms_helper]
<4>[  232.591483]  [<ffffffffa009fe52>] drm_mode_getconnector+0xf7/0x3e8 [drm]
<4>[  232.591547]  [<ffffffffa0093223>] drm_ioctl+0x2bd/0x425 [drm]
<4>[  232.591587]  [<ffffffffa009fd5b>] ? drm_mode_getcrtc+0xc1/0xc1 [drm]

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