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
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
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
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
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
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
On Mon, Feb 22, 2016 at 4:18 PM, Francis Greaves francis@choughs.net 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?
Francis,
Thanks for reporting this. I'd suggest re-posting your question on xen-users -- there are a lot more eyeballs watching that list than this one, and it's easier to "escalate" the issue to the development list from there.
My first instinct is wondering whether grub setting the graphics mode is part of the problem. Have you tried having grub just take the bios text mode that was given it, rather than changing it?
(Obviously ideally Xen would work whatever the graphics mode is, but most developers are accessing test boxes over serial in a colo, so it's not the kind of thing they're prone to notice.)
-George
Dear George, Thanks for the input and ideas. Unfortunately bootscrub=false dos not work, not does setting nothing for vga, still get the 'Little white squares'! I am asking the xen-users as you suggest Regards, Francis
From: "George Dunlap" dunlapg@umich.edu To: "Francis Greaves" francis@choughs.net, "centos-virt" centos-virt@centos.org Sent: Tuesday, 23 February, 2016 09:31:40 Subject: Re: [CentOS-virt] Garbled screen after RAM Scrub on boot
On Mon, Feb 22, 2016 at 4:18 PM, Francis Greaves francis@choughs.net 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?
Francis,
Thanks for reporting this. I'd suggest re-posting your question on xen-users -- there are a lot more eyeballs watching that list than this one, and it's easier to "escalate" the issue to the development list from there.
My first instinct is wondering whether grub setting the graphics mode is part of the problem. Have you tried having grub just take the bios text mode that was given it, rather than changing it?
(Obviously ideally Xen would work whatever the graphics mode is, but most developers are accessing test boxes over serial in a colo, so it's not the kind of thing they're prone to notice.)
-George
On Tue, 23 Feb 2016 14:40, Francis Greaves wrote:
Dear George, Thanks for the input and ideas. Unfortunately bootscrub=false dos not work, not does setting nothing for vga, still get the 'Little white squares'! I am asking the xen-users as you suggest Regards, Francis
From: "George Dunlap" To: "Francis Greaves" , "centos-virt" Sent: Tuesday, 23 February, 2016 09:31:40 Subject: Re: [CentOS-virt] Garbled screen after RAM Scrub on boot
On Mon, Feb 22, 2016 at 4:18 PM, 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"
_________________________________________^ If you no not NEED a gfx boot at bare metal, remove the "rhgb" string, this switches grub from a "full graphic" mode to a "hires textmode", AFAICS, this also influences all grub instances in the whole XEN infrastructure, so it could be a influence.
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?
[snip]
- Yamaban.
I have tried that, but it makes no difference! I have removed all GFX settings, and vga= settings, and rhgb, still no good. All I would like is a 1024x768 screen which shows what is going on at boot. I know I can look in the logs, but it is useful to see. Everything is fine at the login prompt, but the resolution is low.
----- Original Message ----- From: "Yamaban" foerster@lisas.de To: "Discussion about the virtualization on CentOS" centos-virt@centos.org Sent: Tuesday, 23 February, 2016 6:53:43 PM Subject: [CentOS-virt] Re: Garbled screen after RAM Scrub on boot
On Tue, 23 Feb 2016 14:40, Francis Greaves wrote:
Dear George, Thanks for the input and ideas. Unfortunately bootscrub=false dos not work, not does setting nothing for vga, still get the 'Little white squares'! I am asking the xen-users as you suggest Regards, Francis
From: "George Dunlap" To: "Francis Greaves" , "centos-virt" Sent: Tuesday, 23 February, 2016 09:31:40 Subject: Re: [CentOS-virt] Garbled screen after RAM Scrub on boot
On Mon, Feb 22, 2016 at 4:18 PM, 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"
_________________________________________^ If you no not NEED a gfx boot at bare metal, remove the "rhgb" string, this switches grub from a "full graphic" mode to a "hires textmode", AFAICS, this also influences all grub instances in the whole XEN infrastructure, so it could be a influence.
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?
[snip]
- Yamaban. _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-
Alvin Starr -
Francis Greaves -
George Dunlap -
Scot P. Floess -
Yamaban