Bug 93342

Summary: [SKL] Unable to login with 3 monitors connected
Product: DRI Reporter: Humberto Israel Perez Rodriguez <humberto.i.perez.rodriguez>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: SKL i915 features: display/Other, display/watermark
Attachments:
Description Flags
dmesg.log
none
Xorg.log none

Description Humberto Israel Perez Rodriguez 2015-12-11 06:11:14 UTC 
Created attachment 120460 [details]
dmesg.log

==Regresion==
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Not sure


==Bug detailed description==
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Unable to login with 3 monitors connected on ubuntu 15.10 x64

==Attachments==
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dmesg.log
Xorg.log

==Steps to reproduce==
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Start the system with 3 monitors connected to the system and try to login


==Actual results==
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Unable to login with 3 monitors connected

==Expected results==

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Ubuntu must be able to login with 3 monitors connected to the system 


==Additional information==

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Ubuntu only allows login with 2 monitors connected to the system


--- Hardware information ---
Motherboard model             : Skylake Client platform
Motherboard type              : Skylake Y LPDDR3 RVP3 Laptop
Motherboard manufacturer      : Intel Corporation
CPU information               : Intel(R) Core(TM) m5-6Y57 CPU @ 1.10GHz
GPU Card                      : Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller])
KSC                           : 1.15

Linux distribution: Ubuntu 15.10 LTS 64 bits
Kernel: 4.3 mainline from https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?id=refs/tags/v4.3
Bios SKL: SKLSE2R1.R00.B104.B01.1511110114)
xorg-server-1.18.0 from http://cgit.freedesktop.org/xorg/xserver
libdrm-2.4.65 from http://cgit.freedesktop.org/mesa/drm/
xf86-video-intel 2.99.917 from http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/
mesa-11.0.4 from http://cgit.freedesktop.org/mesa/mesa/
libva-1.6.2.pre1 from http://cgit.freedesktop.org/libva/
vaapi-intel-driver 1.6.2.pre1 from http://cgit.freedesktop.org/vaapi/intel-driver
cairo 1.14.4 from http://cgit.freedesktop.org/cairo
Rendercheck 1.5 from http://cgit.freedesktop.org/xorg/app/rendercheck
SKL-Y :  DMC 1.23 and GUC 4.3 firmware from https://01.org/linuxgraphics/intel-linux-graphics-firmwares
IGT 1.13: http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/commit/?id=2db78a4995a8ee298ae0cd68879baf80407a0e5e
Comment 1 Humberto Israel Perez Rodriguez 2015-12-11 06:11:42 UTC 
Created attachment 120461 [details]
Xorg.log
Comment 2 Kenneth Graunke 2015-12-14 09:39:46 UTC 
This isn't a Mesa (3D) bug.  Display is handled by the Linux Kernel.

If you'd like to pursue this with the kernel team, you can change this to

   Product: DRI
   Component: DRM/Intel

Or, if you'd rather not, we can close this as RESOLVED / NOTOURBUG.

There are some restrictions on triple monitor support; my guess is that you've hit some unsupported configuration.  It might be worth talking to someone to confirm before assuming it's a bug.
Comment 3 Humberto Israel Perez Rodriguez 2015-12-14 15:48:57 UTC 
Change this bug to kernel team

Product: DRI
Component: DRM/Intel
Comment 4 Chris Wilson 2015-12-14 15:55:03 UTC 
(In reply to Kenneth Graunke from comment #2)
> This isn't a Mesa (3D) bug.  Display is handled by the Linux Kernel.

The display is wider than Mesa can handle though - it currently has a 8192 cap on textures and framebuffers, which is not enough for this setup.
Comment 5 yann 2016-05-19 13:03:52 UTC 
Humberto, it sounds like we have several WARN_ON(!wm_changed). So please update your system, verify that you are respecting your system spec, then re-test and update the bug accordingly
Comment 6 yann 2016-05-20 09:11:58 UTC 
Re-tested :
with last drm-intel-nightly kernel this issue is fixed
   commit 29cc77ba9ad204023af36bcfd6580a601b91791e
   Author: Chris Wilson <chris@chris-wilson.co.uk>
   Date: Thu May 19 17:59:46 2016 +0100
   drm-intel-nightly: 2016y-05m-19d-16h-59m-17s UTC integration manifest

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