Francis Greaves
2016-Feb-23 13:40 UTC
[CentOS-virt] Garbled screen after RAM Scrub on boot
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 at umich.edu> To: "Francis Greaves" <francis at choughs.net>, "centos-virt" <centos-virt at 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 at 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160223/45b075a2/attachment-0002.html>
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.
Francis Greaves
2016-Feb-23 19:16 UTC
[CentOS-virt] Garbled screen after RAM Scrub on boot
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 at lisas.de> To: "Discussion about the virtualization on CentOS" <centos-virt at 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 at centos.org https://lists.centos.org/mailman/listinfo/centos-virt