I get the same effect of screen blank on memory scrub.
Just as a test try turning off the memory scrub in the xen boot options.
I wonder if xen overwrites the video-ram memory as its cleaning up.
On 02/22/2016 01:06 PM, Scot P. Floess wrote:
Francis,
I just rebooted my Precision 470 and watched...nothing :(
I see the boot menu, and then everything goes blank - as in just a blinking cursor until I get the login prompt.
No idea what it's doing - but I don't even see the scrubbing free memory output...
On Mon, 22 Feb 2016, Francis Greaves wrote:
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@nc.rr.com To: "Francis Greaves" francis@choughs.net Cc: "centos-virt" centos-virt@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
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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