[CentOS-virt] Garbled screen after RAM Scrub on boot

Francis Greaves
Mon, 22 Feb 2016 16:18:53 -0000

Dear All
I am using Centos 7 with Xen 4.6 on a Dell Poweredge T430
When the machine boots, after the 'Scrubbing Free RAM' message, I get a
screen filled with little white squares until the login prompt, so I cannot see
what is happening as the machine boots. Also there is nothing on the screen when
I reboot.

My /etc/default/grub is

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g'
/etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb intremap=no_x2apic_optout"
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=13312M,max:14336M dom0_max_vcpus=6
dom0_vcpus_pin"
GRUB_GFXMODE=1024x768
GRUB_GFXPAYLOAD_LINUX=keep
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen
nomodeset"

I have tried setting (for a 1024x768 resolution) vga=792 in the
GRUB_CMDLINE_LINUX and commenting out GRUB_GFXMODE and GRUB_GFXPAYLOAD_LINUX,
but this makes no difference

What am I doing wrong?

Regards
Francis
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