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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 - [CFL] [IGT] pm_backlight failing if more than 2 pipes connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102568">102568</a>
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<th>Summary</th>
<td>[CFL] [IGT] pm_backlight failing if more than 2 pipes connected
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>DRI git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>luis.botello.ortega@intel.com
</td>
</tr>
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<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>
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<th>i915 platform</th>
<td>CFL
</td>
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<pre>Description
===========================================
pm_backlight@basic-brightness and pm_backlight@fade tests are failing if there
are more than 2 pipes connected to platform.
Software
======================================
kernel version : 4.13.0-rc7-428ed2734-cfl+
architecture : x86_64
os version : Ubuntu 17.04
kernel driver : i915
bios revision : 95.4
bios release date : 07/24/2017
ksc : 1.5
libdrm : 2.4.83
cairo : 1.15.9
intel-gpu-tools (tag) : intel-gpu-tools-1.19-224-gfc651088
intel-gpu-tools (commit) : fc651088
Hardware
======================================
motherboard model : CoffeeLakeClientPlatform
motherboard id : CoffeeLakeSUDIMMRVP
form factor : Desktop
cpu family id : 6
cpu information : Genuine Intel(R) CPU 0000 @ 3.60GHz
gpu card : Intel Corporation Device 3e92 (prog-if 00 [VGA
controller])
memory ram : 15.58 GB
Firmware
======================================
dmc version : 1.1
guc version found : 9.14
IGT output
======================================
(pm_backlight:2883) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:2883) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:2883) CRITICAL: error: 114000 > 0
Stack trace:
#0 [__igt_fail_assert+0x101]
#1 [test_and_verify+0x118]
#2 [_start+0x0]
#3 [<unknown>+0x0]
#4 [<unknown>+0x0]
Subtest fade failed.
**** DEBUG ****
(pm_backlight:2883) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:2883) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:2883) CRITICAL: error: 114000 > 0
(pm_backlight:2883) igt-core-INFO: Stack trace:
(pm_backlight:2883) igt-core-INFO: #0 [__igt_fail_assert+0x101]
(pm_backlight:2883) igt-core-INFO: #1 [test_and_verify+0x118]
(pm_backlight:2883) igt-core-INFO: #2 [_start+0x0]
(pm_backlight:2883) igt-core-INFO: #3 [<unknown>+0x0]
(pm_backlight:2883) igt-core-INFO: #4 [<unknown>+0x0]
**** END ****
dmesg
======================================
[ 364.410557] [IGT] pm_backlight: starting subtest fade
[ 364.410580] [drm:intel_backlight_device_update_status [i915]] updating
intel_backlight, brightness=120000/120000
[ 364.410613] [drm:intel_backlight_device_get_brightness [i915]] get backlight
PWM = 0
[ 364.411014] [drm:intel_backlight_device_update_status [i915]] updating
intel_backlight, brightness=120000/120000
[ 364.411035] [IGT] pm_backlight: exiting, ret=99
[ 364.443984] Console: switching to colour frame buffer device 240x67</pre>
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