[Bug 102568] [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

Elizabeth <elizabethx.de.la.torre.mena at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #3 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
(In reply to Rodrigo Vivi from comment #2)
> This is a potential fix: https://patchwork.freedesktop.org/patch/173990/
> 
> Merged on drm-tip after 4.13.0-rc7...
> 
> So, could you please test latest drm-tip?
Same status:

With two pipes:

$ : sudo -E ./pm_backlight
IGT-Version: 1.20-g7f93a26 (x86_64) (Linux:
4.14.0-rc3-drm-tip-ww40-commit-247cb84+ x86_64)
Subtest basic-brightness: SUCCESS (0.206s)
Subtest bad-brightness: SUCCESS (0.000s)
Subtest fade: SUCCESS (2.322s)

With three:

$ : sudo -E ./pm_backlight
IGT-Version: 1.19-g08a2f88 (x86_64) (Linux:
4.14.0-rc3-drm-tip-ww40-commit-79f8205+ x86_64)
(pm_backlight:1550) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:1550) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:1550) CRITICAL: error: 114000 > 0
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [test_and_verify+0xff]
  #2 [__libc_csu_init+0x0]
Subtest basic-brightness failed.
**** DEBUG ****
(pm_backlight:1550) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:1550) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:1550) CRITICAL: error: 114000 > 0
(pm_backlight:1550) igt-core-INFO: Stack trace:
(pm_backlight:1550) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(pm_backlight:1550) igt-core-INFO:   #1 [test_and_verify+0xff]
(pm_backlight:1550) igt-core-INFO:   #2 [__libc_csu_init+0x0]
****  END  ****
Subtest basic-brightness: FAIL (0.001s)
Subtest bad-brightness: SUCCESS (0.000s)
(pm_backlight:1550) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:1550) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:1550) CRITICAL: error: 114000 > 0
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [test_and_verify+0xff]
  #2 [__libc_csu_init+0x0]
Subtest fade failed.
**** DEBUG ****
(pm_backlight:1550) CRITICAL: Test assertion failure function test_and_verify,
file pm_backlight.c:111:
(pm_backlight:1550) CRITICAL: Failed assertion: ({ typeof(0) _a = (0);
typeof(val - tolerance) _b = (val - tolerance); _a > _b ? _a : _b; }) <= result
(pm_backlight:1550) CRITICAL: error: 114000 > 0
(pm_backlight:1550) igt-core-INFO: Stack trace:
(pm_backlight:1550) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(pm_backlight:1550) igt-core-INFO:   #1 [test_and_verify+0xff]
(pm_backlight:1550) igt-core-INFO:   #2 [__libc_csu_init+0x0]
****  END  ****
Subtest fade: FAIL (0.000s)

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