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

Mon Feb 22 17:51:40 UTC 2016
Francis Greaves <francis at choughs.net>

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

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_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_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 
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