[Bug 95500] [BXT-P/APL] Broken screen appeared when change pipeline for DP or HDMI under 4K resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95500

--- Comment #3 from Elio <elio.martinez.monroy at intel.com> ---
Im not able to reproduce the issue following the next steps, please claryfy if
some step is missing since original steps are not clear enough.

1.Boot normally with 3 pipes (eDP, DP connected to 4k monitor, HDMI to 1080).
2.Turn off eDP (xrandr --output eDP1 --off)
3.Check remaining displays (DP to 4k and HDMI to 1080)
4.Play with different values over DP. No blurred screen on HDMI and DP never
went to black.

Please check the following configuration:


 |=== Software information ===|

 ++ Kernel version                      :
4.6.0-drm-intel-nightly-ww21-commit-d381724+
 ++ Linux distribution                  : Ubuntu 16.04 LTS
 ++ Architecture                        : 64-bit
 ++ Mesa version                        : 11.2.2 (git-3a9f628
 ++ xf86-video-intel version            : 2.99.917
 ++ Xorg-Xserver version                : 1.18.3
 ++ DRM version                         : 2.4.68
 ++ VAAPI version                       : Intel i965 driver for Intel(R)
Broxton - 1.7.0
 ++ Cairo version                       : 1.15.2
 ++ Intel GPU Tools version             : Tag
[intel-gpu-tools-1.14-348-g303b380] / Commit [303b380]
 ++ Kernel driver in use                : i915
 ++ Hardware acceleration               : Enabled
 ++ Bios revision                       : 138.25
 ++ KSC revision                        : 1.6


 |=== Hardware information ===|

 ++ Platform                            : BXT-P
 ++ Motherboard model                   : Broxton P
 ++ Motherboard type                    : NOTEBOOK Hand Held
 ++ Motherboard manufacturer            : Intel Corp.
 ++ CPU family                          : Other
 ++ CPU information                     : 06/5c
 ++ GPU Card                            : Intel Corporation Device 5a84 (rev
0a) (prog-if 00 [VGA controller])
 ++ Memory ram                          : 8 GB
 ++ Maximum memory ram allowed          : 16 GB
 ++ Display resolution                  : 3840x1080
 ++ CPU's number                        : 4
 ++ Hard drive capacity                 : 120 GB

With this configuration we are avoiding messages that are indicating that you
Kernel is showing such as:

[   73.691242] WARNING: CPU: 0 PID: 1530 at
drivers/gpu/drm/i915/intel_pm.c:3647 skl_update_other_pipe_wm+0x172/0x180
[i915]
[   73.691243] WARN_ON(!wm_changed)
[   73.691244] Modules linked in:
[   73.691250]  ax88179_178a usbnet mii xhci_plat_hcd dwc3 udc_core
x86_pkg_temp_thermal coretemp nls_iso8859_1 kvm_intel kvm irqbypass
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw
gf128mul glue_helper ablk_helper cryptd serio_raw shpchp dwc3_pci mei_me mei
rfkill_gpio tpm_crb intel_pmc_ipc mac_hid sunrpc parport_pc ppdev lp parport
autofs4 hid_generic usbhid i915 psmouse xhci_pci xhci_hcd drm_kms_helper
sdhci_pci syscopyarea igb sdhci sysfillrect sysimgblt fb_sys_fops dca ptp drm
ahci pps_core i2c_algo_bit libahci i2c_hid hid video
[   73.691295] CPU: 0 PID: 1530 Comm: Xorg Tainted: G     U  W I    
4.6.0-rc6-nightly+ #37
[   73.691296] Hardware name: Intel Corp. Broxton P/NOTEBOOK, BIOS
APLKRVPA.X64.0126.B51.1602260229 02/26/2016
[   73.691297]  0000000000000000 ffff880273f4b930 ffffffff813b325c
ffff880273f4b980
[   73.691299]  0000000000000000 ffff880273f4b970 ffffffff81079ec1
00000e3f00000000
[   73.691302]  ffff8802714b2000 ffff8802714b0000 0000000000000004
ffff8802763de3d0
[   73.691304] Call Trace:
[   73.691307]  [<ffffffff813b325c>] dump_stack+0x63/0x87
[   73.691308]  [<ffffffff81079ec1>] __warn+0xd1/0xf0
[   73.691310]  [<ffffffff81079f2f>] warn_slowpath_fmt+0x4f/0x60
[   73.691326]  [<ffffffffa0230000>] ? gen6_pm_rps_work+0x30/0x300 [i915]
[   73.691343]  [<ffffffffa023d182>] skl_update_other_pipe_wm+0x172/0x180
[i915]
[   73.691360]  [<ffffffffa023d32a>] skl_update_wm+0x19a/0x6f0 [i915]
[   73.691381]  [<ffffffffa02b33de>] ? bxt_ddi_pll_disable+0x4e/0x60 [i915]
[   73.691397]  [<ffffffffa023e8ce>] intel_update_watermarks+0x1e/0x30 [i915]
[   73.691417]  [<ffffffffa02a5225>] intel_atomic_commit+0x435/0x1fc0 [i915]
[   73.691421]  [<ffffffff811d9967>] ? kmem_cache_alloc_trace+0x187/0x210
[   73.691426]  [<ffffffffa0187045>] ?
drm_atomic_helper_connector_duplicate_state+0x35/0x80 [drm_kms_helper]



As reference please check attached dmesg.

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