[Bug 102568] New: [CFL] [IGT] pm_backlight failing if more than 2 pipes connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102568

            Bug ID: 102568
           Summary: [CFL] [IGT] pm_backlight failing if more than 2 pipes
                    connected
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: luis.botello.ortega at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: CFL

Description
===========================================
pm_backlight at basic-brightness and pm_backlight at 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

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