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VGA distributor hardware detection
Post 303012646 by diehard on Wednesday 7th of February 2018 07:54:41 AM
02-07-2018
VGA distributor hardware detection
Hi,
I am trying to find the monitor information attach to my system. To get the detail I have decoded the information available in edid file using edid-decode utility.
The file is available at /sys/devices/pci0000:00/0000:00:01.0/drm/card0/card0-VGA-1/edid
After decoding edid file I get the attached monitor details. Now I have situation where I am using VGA distributor which split the signal and I can connect multiple monitor through it.After doing this I am still getting the same monitor information in my edid file.Second monitor detail is missing from it. I try to restart the system and found that file empty edid file is generated if two monitor is connected.
I have concluded that after starting the system some utility is actually creating the edid file but I am not sure which one is doing this.
Can anyone let me know how to detect if multiple monitor is connected to my system through VGA distributor ? I am using Ubuntu 14.04 on HP machine.
Any help or suggestion is highly appreciated.
Thanks
I am trying to find the monitor information attach to my system. To get the detail I have decoded the information available in edid file using edid-decode utility.
The file is available at /sys/devices/pci0000:00/0000:00:01.0/drm/card0/card0-VGA-1/edid
After decoding edid file I get the attached monitor details. Now I have situation where I am using VGA distributor which split the signal and I can connect multiple monitor through it.After doing this I am still getting the same monitor information in my edid file.Second monitor detail is missing from it. I try to restart the system and found that file empty edid file is generated if two monitor is connected.
I have concluded that after starting the system some utility is actually creating the edid file but I am not sure which one is doing this.
Can anyone let me know how to detect if multiple monitor is connected to my system through VGA distributor ? I am using Ubuntu 14.04 on HP machine.
Any help or suggestion is highly appreciated.
Thanks
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LEARN ABOUT REDHAT
vga
VGA(4x) VGA(4x) NAME
vga - Generic VGA video driver SYNOPSIS
Section "Device" Identifier "devname" Driver "vga" ... EndSection DESCRIPTION
vga is an XFree86 driver for generic VGA video cards. It can drive most VGA-compatible video cards, but only makes use of the basic stan- dard VGA core that is common to these cards. The driver supports depths 1, 4 and 8. All relevant visual types are supported at each depth. Multi-head configurations are supported in combination with some other drivers, but only when the vga driver is driving the primary head. SUPPORTED HARDWARE
The vga driver supports most VGA-compatible video cards. There are some known exceptions, and those should be listed here. CONFIGURATION DETAILS
Please refer to XF86Config(5x) for general configuration details. This section only covers configuration details specific to this driver. The driver auto-detects the presence of VGA-compatible hardware. The ChipSet name may optionally be specified in the config file "Device" section, and will override the auto-detection: "generic" The driver will only use 64k of video memory for depth 1 and depth 8 operation, and 256k of video memory for depth 4 (this is the standard VGA limit). When operating at depth 8, only a single built-in 320x200 video mode is available. At other depths there is more flexibility regarding mode choice. The following driver Options are supported: Option "ShadowFB" "boolean" Enable or disable use of the shadow framebuffer layer. Default: off. This option is recommended for performance reasons when running at depths 1 and 4, especially when using modern PCI-based hardware. It is required when using those depths in a multi-head configuration where one or more of the other screens is operating at a dif- ferent depth. SEE ALSO
XFree86(1), XF86Config(5x), xf86config(1), Xserver(1), X(7x) AUTHORS
Authors include: Marc La France, David Dawes, and Dirk Hohndel. XFree86 Version Version 4.3.0 VGA(4x)