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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BSW]igt/kms_setmode sporadically causes *ERROR* CPU pipe C FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85906">85906</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BSW]igt/kms_setmode sporadically causes *ERROR* CPU pipe C FIFO underrun
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>==System Environment==
--------------------------
Regression: not sure
Non-working platforms: BSW
==kernel==
--------------------------
drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473
==Bug detailed description==
--------------------------
It sporadically fails on BSW with -nightly kernel, fail rate:3/5.
output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
Test id#1 CRTC count 2
CRTC[8] [Pipe A] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[13] [Pipe B] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
Test id#2 CRTC count 2
CRTC[13] [Pipe B] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[8] [Pipe A] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
Test id#3 CRTC count 2
CRTC[8] [Pipe A] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Test id#4 CRTC count 2
CRTC[13] [Pipe B] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Test id#5 CRTC count 2
CRTC[8] [Pipe A] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Test id#6 CRTC count 2
CRTC[13] [Pipe B] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Testing: clone-exclusive-crtc 3 connector combinations
Test id#7 CRTC count 3
CRTC[8] [Pipe A] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[13] [Pipe B] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Test id#8 CRTC count 3
CRTC[13] [Pipe B] Mode: 1920x1080@60Hz Connectors: eDP-1[29]
CRTC[8] [Pipe A] Mode: 640x480@60Hz Connectors: HDMI-A-1[22] (NC)
CRTC[18] [Pipe C] Mode: 640x480@60Hz Connectors: HDMI-A-2[35] (NC)
Subtest clone-exclusive-crtc: SUCCESS (50.313s)
[ 59.872283] WARNING: CPU: 1 PID: 3796 at drivers/gpu/drm/drm_irq.c:1089
drm_wait_one_vblank+0x10e/0x16c [drm]()
[ 59.872288] vblank wait timed out on crtc 0
[ 59.872291] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic serio_raw pcspkr
i2c_i801 lpc_ich mfd_core s
nd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd
soundcore battery ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcop
yarea option usb_wwan usbserial
[ 59.872340] CPU: 1 PID: 3796 Comm: kms_setmode Tainted: G W
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ #1198
[ 59.872345] 0000000000000000 0000000000000009 ffffffff81789002
ffff88017a627a88
[ 59.872352] ffffffff810368cc ffff88017ab80000 ffffffffa006aa9e
ffff88017ab80000
[ 59.872358] 0000000000000000 ffff8801759bb000 0000000000000000
0000000000000283
[ 59.872366] Call Trace:
[ 59.872380] [<ffffffff81789002>] ? dump_stack+0x41/0x51
[ 59.872390] [<ffffffff810368cc>] ? warn_slowpath_common+0x78/0x90
[ 59.872405] [<ffffffffa006aa9e>] ? drm_wait_one_vblank+0x10e/0x16c [drm]
[ 59.872414] [<ffffffff8103697c>] ? warn_slowpath_fmt+0x45/0x4a
[ 59.872423] [<ffffffff8105f5df>] ? prepare_to_wait_event+0xb0/0xec
[ 59.872438] [<ffffffffa006aa9e>] ? drm_wait_one_vblank+0x10e/0x16c [drm]
[ 59.872445] [<ffffffff8105f8e9>] ? add_wait_queue+0x3c/0x3c
[ 59.872484] [<ffffffffa0124033>] ? i9xx_crtc_disable+0x66/0x353 [i915]
[ 59.872520] [<ffffffffa0128218>] ? __intel_set_mode+0xd60/0x13d4 [i915]
[ 59.872527] [<ffffffff8178610f>] ? printk+0x4f/0x54
[ 59.872543] [<ffffffffa006bff7>] ? drm_ut_debug_printk+0x59/0x5e [drm]
[ 59.872579] [<ffffffffa012a9da>] ? intel_set_mode+0xd/0x27 [i915]
[ 59.872615] [<ffffffffa012b5fd>] ? intel_crtc_set_config+0x767/0xac1 [i915]
[ 59.872634] [<ffffffffa0070f21>] ? drm_mode_set_config_internal+0x48/0xbd
[drm]
[ 59.872652] [<ffffffffa0074934>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
[ 59.872668] [<ffffffffa0069738>] ? drm_ioctl+0x279/0x3bc [drm]
[ 59.872676] [<ffffffff810e86b6>] ? tlb_finish_mmu+0xb/0x2f
[ 59.872693] [<ffffffffa007454e>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
[ 59.872708] [<ffffffffa0068ac7>] ? drm_gem_vm_close+0x2a/0x4b [drm]
[ 59.872716] [<ffffffff8111a53f>] ? do_vfs_ioctl+0x3ec/0x435
[ 59.872724] [<ffffffff8109d57a>] ? __audit_syscall_entry+0xb2/0xd2
[ 59.872732] [<ffffffff8100d27c>] ? syscall_trace_enter_phase1+0x11e/0x127
[ 59.872739] [<ffffffff8111a5d1>] ? SyS_ioctl+0x49/0x78
[ 59.872745] [<ffffffff8109d7a3>] ? __audit_syscall_exit+0x209/0x225
[ 59.872753] [<ffffffff8178e692>] ? system_call_fastpath+0x12/0x17
[ 59.872757] ---[ end trace 9dd1ea0a051c93e4 ]---
==Reproduce steps==
----------------------------
1. ./kms_setmode --run-subtest clone-exclusive-crtc</pre>
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