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EFI + RHEL6_x64 = NO VIDEO ?
Posted: 19. Feb 2011, 15:42
by Nutternot
Hi!
UEFI support in VB got me interested and I installed it yesterday.
I used RHEL6x64 as guest with EFI and Win7x64(8GBRAM/512MBGraphics)as host.
But,even after complete installation, I got no video.
MBR method works fine though.
Checked the manual and all I found there was - two types of video mode in UEFI - Mac/Linux
Nothing substantial !
Does rhel6 video work in UEFI ?
Thanks
Re: EFI + RHEL6_x64 = NO VIDEO ?
Posted: 19. Feb 2011, 18:11
by Sasquatch
Your question is better placed in the Red Hat forums. Only some OSes support EFI, and if yours doesn't, then just disable EFI and leave it at that. Want to know if it's supported by your OS, then ask the one who created/maintains it.
Re: EFI + RHEL6_x64 = NO VIDEO ?
Posted: 6. May 2011, 17:09
by ahendricks
From the user guide Chapter 3....
Video modes in EFIEFI provides two distinct video interfaces: GOP (Graphics Output Protocol) and UGA (Universal Graphics Adapter). Mac OS X uses GOP, while Linux tends to use UGA. VirtualBox provides a configuration option to control the framebuffer size for both interfaces.
To control GOP, use the following VBoxManage command:
VBoxManage setextradata "VM name" VBoxInternal2/EfiGopMode N
Where N can be one of 0,1,2,3,4 referring to the 640x480, 800x600, 1024x768, 1280x1024, 1440x900 screen resolution respectively.
To change the UGA resolution:
VBoxManage setextradata "VM name" VBoxInternal2/UgaHorizontalResolution 1440
VBoxManage setextradata "VM name" VBoxInternal2/UgaVerticalResolution 900
The video mode for both GOP and UGA can only be changed when the VM is powered off and remains persistent until changed.