[Bug 99384] New: [i915] One of two displays not detected

Thu Jan 12 13:21:36 UTC 2017

https://bugs.freedesktop.org/show_bug.cgi?id=99384

            Bug ID: 99384
           Summary: [i915] One of two displays not detected
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: lukasz.goralczyk at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128913
  --> https://bugs.freedesktop.org/attachment.cgi?id=128913&action=edit
xorg log (hostname stripped)

Hi,

At some point, after upgrade, one of my displays stopped being detected. I can
forcefully make it work but xrandr reports as the display not being connected
(which causes some annoyances in KDE).

My setup:
---------

*** uname -a:
Linux _____ 4.8.13-1-ARCH #1 SMP PREEMPT Fri Dec 9 07:24:34 CET 2016 x86_64
GNU/Linux

*** packages:
xorg 1.19.1
xf86-video-intel 1:2.99.917+747+g028c946d-1

*** lspci:
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller
(rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor
HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series
Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 8 Series/C220 Series Chipset
Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev
04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High
Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #1 (rev d4)
00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #2 (rev d4)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Q87 Express LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family
6-port SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus
Controller (rev 04)
02:00.0 PCI bridge: Texas Instruments XIO2001 PCI Express-to-PCI Bridge

*** xrandr after forcing output:
Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
DP1 disconnected 2560x1440+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
   1920x1200     59.95  
   2560x1440_60.00  60.00* 
DP1-1 disconnected (normal left inverted right x axis y axis)
DP1-8 disconnected (normal left inverted right x axis y axis)
DP2 connected primary 1920x1200+2560+0 (normal left inverted right x axis y
axis) 520mm x 320mm
   1920x1200     59.95*+
   1920x1080     50.00  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.90  
   1280x960      60.00  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Display setup:
Two displays, one connected through DisplayPort (this one is not detected) the
other connected through DisplayPort + converter to HDMI (works).

Notes:
1. It used to work with old xorg driver
(xf86-video-intel-1:2.99.917+730+gdad64e9-1), but occasionally the display
stopped being detected.
2. I can force the output by these commands:
--- start ---
xrandr --newmode "2560x1440_60.00"  311.83  2560 2744 3024 3488  1440 1441 1444
1490  -HSync +Vsync
xrandr --addmode DP1 2560x1440_60.00
xrandr --output DP1 --mode 1920x1200 --left-of DP2
--- end ---

I tried different display set-up - the same effect, I didn't play with kernel
driver as I noticed that problem doesn't exist with old version of xorg driver.

Lukasz G.

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