Public bug reported:
I have an Ubuntu Server 18.04 installation with KVM and a guest OS to
which a AMD video card needs to be passed through. It worked great for
about 9 months and after a recent Ubuntu upgrade, efifb grabs the video
card irrespective of the linux command line. The commnand line that
worked before is:
GRUB_CMDLINE_LINUX_DEFAULT="amd_iommu=on iommu=pt pci_stubs=1106:3483
vga=normal nofb nomodeset video=efifb:off"
Currently, this is the command line (changes I made based on searching the web
for hours):
GRUB_CMDLINE_LINUX_DEFAULT="quiet amd_iommu=on iommu=pt earlymodules=vfio-pci
pci_stubs=1106:3483 vga=normal nofb nomodeset video=vesafb:off,efifb:off
gfxpayload=text"
The current active kernel options (proc/cmdline)
BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic
root=UUID=a83137ad-9598-4dc2-aca9-7ab19d17d3c0 ro quiet amd_iommu=on
iommu=pt earlymodules=vfio-pci pci_stubs=1106:3483 vga=normal nofb
nomodeset video=vesafb:on,efifb:off gfxpayload=text
This is verified by syslog:
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic
root=UUID=a83137ad-9598-4dc2-aca9-7ab19d17d3c0 ro quiet amd_iommu=on
iommu=pt earlymodules=vfio-pci pci_stubs=1106:3483 vga=normal nofb
nomodeset video=vesafb:on,efifb:off gfxpayload=text
According to one of the web sites I found, any (or all) of the following
options should disable the frame buffer:
vga=normal nofb nomodeset video=vesafb:on,efifb:off
Yet, a framebuffer is still created
crw-rw---- 1 root video 29, 0 May 8 18:26 /dev/fb0
Memory locked by efifb (grep -B 5 -A 5 "26[:]00" /proc/iomem)
e0000000-fec2ffff : PCI Bus 0000:00
e0000000-f01fffff : PCI Bus 0000:26
e0000000-efffffff : 0000:26:00.0
e0000000-e01effff : efifb
f0000000-f01fffff : 0000:26:00.0
f0000000-f01fffff : vfio-pci
Yet, vfio driver is successfully loaded for this device: (ls
/sys/bus/pci/drivers/vfio-pci/)
/sys/bus/pci/drivers/vfio-pci/0000:26:00.0
/sys/bus/pci/drivers/vfio-pci/0000:26:00.1
Any help on how efifb can be blocked from loading will be greatly
appreciated.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: grub2-common 2.02-2ubuntu8.13
ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
Uname: Linux 4.15.0-47-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed May 8 19:32:36 2019
InstallationDate: Installed on 2017-01-12 (846 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: grub2
UpgradeStatus: Upgraded to bionic on 2018-09-27 (223 days ago)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 bionic urgent
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https://bugs.launchpad.net/bugs/1828273
Title:
Framebuffer setting in GRUB_CMDLINE_LINUX_DEFAULT has no effect
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