Red Hat Bugzilla – Bug 1022047
Problem with detection 2 LCD monitors (notebook LCD is detected)
Last modified: 2013-11-26 05:53:41 EST
Created attachment 815022 [details]
Description of problem:
On my desk I have following situation.
2 LCD Monitors (Samsung 22" and NEC 23")
One built in monitor in notebook.
Problem is that just one monitor is detected.
In my case Samsung 22".
I work under Gnome Display Manager.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2nd monitor NEC 23" is disabled and not detected by Fedora 20.
Second monitor (NEC 23") will be allowed and
I will be able to work on them.
output from lspci:
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 7 Series/C210 Series Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [NVS 5400M] (rev a1)
02:00.0 System peripheral: Ricoh Co Ltd MMC/SD Host Controller (rev 07)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
Output of xrandr is:
Screen 0: minimum 320 x 200, current 3280 x 1050, maximum 8192 x 8192
LVDS1 connected primary 1600x900+1680+0 (normal left inverted right x axis y axis) 309mm x 174mm
1600x900 60.0*+ 40.0
800x600 60.3 56.2
VGA1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 459mm x 296mm
1280x1024 75.0 60.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 60.0
When Samsung monitor is turn off and unplugged from docking station then NEC monitor is detected and working properly.
Some more information about the issue.
System is upgraded from Fedora 19 via fedup.
Is there any way how to properly detect whether LCD external display is connected?
lspci and xrandr does not show him.
how are they connected? if they are both connected to VGA just on laptop and docking station then it won't ever work, these are the same port.
the monitors are connected over VGA and over DVI port or DisplayPort.
By the way it seems that mainboard of notebook is broken and therefore DVI port and DisplayPort is not working at all.
The issue seems to be a HW problem not Linux problem
I will close the bug.
I have to reopen bug. Sorry for that.
Current situation is that HW (motherboard) was replaced by newer one.
On F19 (live DVD) 2 external monitors are detected without any problem.
Even two external monitors are detected with gnome-control-center -> display.
On Fedora 20 I am not able to detect two external monitors.
1st external monitor is connected via VGA (connected properly)
2nd external monitor is connected via DisplayPort or DVI port
Even gnome-control-center does not show two external monitors.
After updating to versions:
All works fine.