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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [ILK]igt/kms_mmio_vs_cs_flip/setplane_vs_cs_flip sporadically causes system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86095#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [ILK]igt/kms_mmio_vs_cs_flip/setplane_vs_cs_flip sporadically causes system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86095">bug 86095</a>
from <span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=109925" name="attach_109925" title="dmesg(CONFIG_DRM_I915_FBDEV=n)">attachment 109925</a> <a href="attachment.cgi?id=109925&action=edit" title="dmesg(CONFIG_DRM_I915_FBDEV=n)">[details]</a></span>
dmesg(CONFIG_DRM_I915_FBDEV=n)
add CONFIG_DRM_I915_FBDEV=n, the hang disappears, but reports warning.
[ 193.280972] ------------[ cut here ]------------
[ 193.281040] WARNING: CPU: 1 PID: 3960 at
drivers/gpu/drm/i915/intel_display.c:901 intel_wait_for_vblank+0xab/0x1a0
[i915]()
[ 193.281046] vblank wait on pipe B timed out
[ 193.281050] Modules linked in: netconsole configfs snd_hda_codec_hdmi
snd_hda_codec_idt snd_hda_codec_generic i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller firew
ire_ohci snd_hda_codec snd_hwdep firewire_core crc_itu_t snd_pcm bcma snd_timer
snd soundcore dm_mod wmi battery parport_pc parport tpm_tis tpm ac acpi_cpufreq
i915 button video
drm_kms_helper drm [last unloaded: netconsole]
[ 193.281150] CPU: 1 PID: 3960 Comm: kms_mmio_vs_cs_ Tainted: G W
3.18.0-rc5_kcloud_342400_20141124+ #184
[ 193.281155] Hardware name: Dell Inc. Latitude E6510/0JKDHD, BIOS A05
08/10/2010
[ 193.281159] 00000000 00000000 ec675cac c17689a2 ec675cd4 ec675cc4 c10312af
f85ab08c
[ 193.281180] f57f0000 00000453 fffe5e39 ec675cdc c10312f1 00000009 ec675cd4
f85f6674
[ 193.281202] ec675cf0 ec675d08 f85ab08c f85f4a09 00000385 f85f6674 00000042
00000001
[ 193.281223] Call Trace:
[ 193.281234] [<c17689a2>] dump_stack+0x41/0x52
[ 193.281244] [<c10312af>] warn_slowpath_common+0x66/0x7d
[ 193.281295] [<f85ab08c>] ? intel_wait_for_vblank+0xab/0x1a0 [i915]
[ 193.281303] [<c10312f1>] warn_slowpath_fmt+0x2b/0x2f
[ 193.281354] [<f85ab08c>] intel_wait_for_vblank+0xab/0x1a0 [i915]
[ 193.281407] [<f85c4051>] intel_dp_link_down+0x18b/0x195 [i915]
[ 193.281459] [<f85c43f0>] ilk_post_disable_dp+0x1a/0xb9 [i915]
[ 193.281509] [<f85b3bbb>] ironlake_crtc_disable+0xb5/0x630 [i915]
[ 193.281561] [<f85af13c>] __intel_set_mode+0x6d1/0x109a [i915]
[ 193.281568] [<c106f337>] ? vprintk_emit+0x468/0x47b
[ 193.281574] [<c106f337>] ? vprintk_emit+0x468/0x47b
[ 193.281624] [<f85b54a6>] intel_set_mode+0x17/0x2f [i915]
[ 193.281675] [<f85b612b>] intel_crtc_set_config+0x8be/0x984 [i915]
[ 193.281706] [<f8053268>] drm_mode_set_config_internal+0x41/0xa0 [drm]
[ 193.281734] [<f8056522>] drm_mode_setcrtc+0x32b/0x40e [drm]
[ 193.281762] [<f80561f7>] ? drm_mode_setplane+0x188/0x188 [drm]
[ 193.281784] [<f804c2ea>] drm_ioctl+0x39d/0x413 [drm]
[ 193.281811] [<f80561f7>] ? drm_mode_setplane+0x188/0x188 [drm]
[ 193.281820] [<c1020792>] ? lapic_next_event+0x1b/0x1f
[ 193.281842] [<f804bf4d>] ? drm_copy_field+0x5c/0x5c [drm]
[ 193.281850] [<c110ec48>] do_vfs_ioctl+0x417/0x4cc
[ 193.281857] [<c107f22b>] ? current_kernel_time+0x54/0x98
[ 193.281863] [<c106205d>] ? trace_hardirqs_on_caller+0x14b/0x166
[ 193.281869] [<c1062083>] ? trace_hardirqs_on+0xb/0xd
[ 193.281876] [<c110ed40>] SyS_ioctl+0x43/0x67
[ 193.281903] [<c176f278>] sysenter_do_call+0x12/0x12
[ 193.281909] ---[ end trace c5acaa57c78c67fb ]---</pre>
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