Dual monitors work at boot but not in console
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I have a system with a dual-head video card (VGA + HDMI). If I connect both monitors at once, I can:
- See the BIOS/boot messages mirror on both displays.
- When I start
xorg, I can mirror both displays, enable multiple desktops, etc.
But when I just boot to the console, and don't start xorg, I only get the console display on a single monitor, and I want it mirrored on both. This is odd, since it can apparently mirror the displays at boot/POST time.
What commands/configure-files/kernel-boot-params do I need to set/modify to have both monitors mirror the console? I'm using CentOS v7.3 on x86_64.
centos boot console multi-monitor
asked Sep 27 '17 at 0:01
DevNull
17218
add a comment |Â
up vote
0
down vote
favorite
I have a system with a dual-head video card (VGA + HDMI). If I connect both monitors at once, I can:
- See the BIOS/boot messages mirror on both displays.
- When I start
xorg, I can mirror both displays, enable multiple desktops, etc.
But when I just boot to the console, and don't start xorg, I only get the console display on a single monitor, and I want it mirrored on both. This is odd, since it can apparently mirror the displays at boot/POST time.
What commands/configure-files/kernel-boot-params do I need to set/modify to have both monitors mirror the console? I'm using CentOS v7.3 on x86_64.
centos boot console multi-monitor
asked Sep 27 '17 at 0:01
DevNull
17218
If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a system with a dual-head video card (VGA + HDMI). If I connect both monitors at once, I can:
- See the BIOS/boot messages mirror on both displays.
- When I start
xorg, I can mirror both displays, enable multiple desktops, etc.
But when I just boot to the console, and don't start xorg, I only get the console display on a single monitor, and I want it mirrored on both. This is odd, since it can apparently mirror the displays at boot/POST time.
What commands/configure-files/kernel-boot-params do I need to set/modify to have both monitors mirror the console? I'm using CentOS v7.3 on x86_64.
centos boot console multi-monitor
asked Sep 27 '17 at 0:01
DevNull
17218
I have a system with a dual-head video card (VGA + HDMI). If I connect both monitors at once, I can:
- See the BIOS/boot messages mirror on both displays.
- When I start
xorg, I can mirror both displays, enable multiple desktops, etc.
But when I just boot to the console, and don't start xorg, I only get the console display on a single monitor, and I want it mirrored on both. This is odd, since it can apparently mirror the displays at boot/POST time.
What commands/configure-files/kernel-boot-params do I need to set/modify to have both monitors mirror the console? I'm using CentOS v7.3 on x86_64.
centos boot console multi-monitor
centos boot console multi-monitor
asked Sep 27 '17 at 0:01
DevNull
17218
asked Sep 27 '17 at 0:01
DevNull
17218
asked Sep 27 '17 at 0:01
DevNull
17218
asked Sep 27 '17 at 0:01
DevNull
17218
asked Sep 27 '17 at 0:01
DevNull
17218
17218
If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12
add a comment |Â
If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12
If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12
If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12
add a comment |Â
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If you use raw framebuffer you need to configure it (tldp.org/HOWTO/Framebuffer-HOWTO/x1010.html , dafyddcrosby.com/dual-framebuffers). If you use Kernel Mode Setting with specific driver you probably need to check driver manual
– user996142
Sep 27 '17 at 0:12