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

Francis Greaves
Mon, 22 Feb 2016 17:51:40 -0000

Yes I usually work headless, but I have been setting it up from new, so need to
see what is going on.
Regards
Francis



From: "Scot P. Floess" <sfloess at nc.rr.com>
To: "Francis Greaves" <francis at choughs.net>
Cc: "centos-virt" <centos-virt at centos.org>
Sent: Monday, 22 February, 2016 17:02:12
Subject: Re: [CentOS-virt] Garbled screen after RAM Scrub on boot

When I was running Fedora 23 and using Xen (as the host OS), I saw
something similar on my Dell Precision 470. I don't recall seeing it now
with CentOS 7, but I tend to boot that machine headless more than not...

On Mon, 22 Feb 2016, Francis Greaves wrote:

> 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
>
>

Scot P. Floess RHCT (Certificate Number 605010084735240)
Chief Architect FlossWare http://sourceforge.net/projects/flossware
http://flossware.sourceforge.net
https://github.com/organizations/FlossWare
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