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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 - [BAT SKL] sporadic WARNING backtrace: "DC6 already programmed to be enabled.""
href="https://bugs.freedesktop.org/show_bug.cgi?id=93697">93697</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BAT SKL] sporadic WARNING backtrace: "DC6 already programmed to be enabled."
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>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>daniel@ffwll.ch
</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>This seems to be a very sporadic failure which happens on bot skl-i5k-2 and
skl-i7k-2 with the kms_flip@basic-flip-vs-dpms testcase. For long term results
overview see
/archive/results/CI_IGT_test/igt@<a href="mailto:kms_flip@basic-flip-vs-dpms.html">kms_flip@basic-flip-vs-dpms.html</a>
The thestcase itself completes without hiccup, it's just the backtrace in the
kernel:
[ 170.702268] ------------[ cut here ]------------
[ 170.702285] WARNING: CPU: 0 PID: 5863 at
drivers/gpu/drm/i915/intel_runtime_pm.c:578 skl_enable_dc6+0x16a/0x190 [i915]()
[ 170.702287] DC6 already programmed to be enabled.
[ 170.702288] Modules linked in: ax88179_178a usbnet mii x86_pkg_temp_thermal
i915 intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul mei_me mei i2c_hid
e1000e ptp pps_core
[ 170.702300] CPU: 0 PID: 5863 Comm: kms_flip Tainted: G U
4.4.0-gfxbench+ #1
[ 170.702302] Hardware name: System manufacturer System Product
Name/Z170M-PLUS, BIOS 0505 11/16/2015
[ 170.702303] ffffffffa0210718 ffff88022ec5baa0 ffffffff813df90c
ffff88022ec5bae8
[ 170.702306] ffff88022ec5bad8 ffffffff810746e1 ffff88022bda0000
ffff880230a08000
[ 170.702309] 0000000000000002 ffff88022bda0000 0000000000000800
ffff88022ec5bb38
[ 170.702312] Call Trace:
[ 170.702316] [<ffffffff813df90c>] dump_stack+0x4e/0x82
[ 170.702318] [<ffffffff810746e1>] warn_slowpath_common+0x81/0xc0
[ 170.702320] [<ffffffff81074767>] warn_slowpath_fmt+0x47/0x50
[ 170.702329] [<ffffffffa0140cba>] skl_enable_dc6+0x16a/0x190 [i915]
[ 170.702338] [<ffffffffa01411f6>] gen9_dc_off_power_well_disable+0x136/0x240
[i915]
[ 170.702347] [<ffffffffa013ee67>] intel_power_well_disable+0x27/0x50 [i915]
[ 170.702356] [<ffffffffa0141937>] intel_display_power_put+0xb7/0x130 [i915]
[ 170.702370] [<ffffffffa0191fae>] modeset_put_power_domains+0x3e/0x50 [i915]
[ 170.702385] [<ffffffffa01a3aac>] intel_atomic_commit+0x9ac/0x17c0 [i915]
[ 170.702389] [<ffffffff814ea061>] ?
__drm_atomic_helper_crtc_duplicate_state+0x51/0x70
[ 170.702391] [<ffffffff8150e192>] drm_atomic_commit+0x32/0x50
[ 170.702394] [<ffffffff814e9949>]
drm_atomic_helper_connector_dpms+0xe9/0x1a0
[ 170.702396] [<ffffffff81502f85>]
drm_mode_obj_set_property_ioctl+0x235/0x240
[ 170.702398] [<ffffffff81502fbb>]
drm_mode_connector_property_set_ioctl+0x2b/0x30
[ 170.702400] [<ffffffff814f3eed>] drm_ioctl+0x13d/0x590
[ 170.702403] [<ffffffff81502f90>] ?
drm_mode_obj_set_property_ioctl+0x240/0x240
[ 170.702405] [<ffffffff811c1ff3>] ? __vfs_read+0x23/0xd0
[ 170.702407] [<ffffffff811d4c4c>] do_vfs_ioctl+0x2fc/0x550
[ 170.702410] [<ffffffff811e06ba>] ? __fget_light+0x6a/0x90
[ 170.702412] [<ffffffff811d4edc>] SyS_ioctl+0x3c/0x70
[ 170.702414] [<ffffffff8179a75b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 170.702416] ---[ end trace d8793596364dbb8b ]---</pre>
</div>
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