Re: [Xen-devel] [Xen-users] Garbled screen after RAM Scrub on boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.03.16 at 15:33, <George.Dunlap@xxxxxxxxxxxxx> wrote:
> Have you guys ever seen something like this before?  Any ideas how to 
> proceed?

What Andrew said is one possibility. There could be others, depending
on when _exactly_ these odd little squares show up. However, as to
what Andrew suggests - afaict this ought to lead to a black screen,
since character zero is a blank one in all our fonts, not a little box
(which is usually used to represent unknown characters), and even
the character used in debug build (0xc2) isn't represented by a little
box in any of our fonts. I therefore suspect the problem to be
introduced by the Dom0 kernel, not the hypervisor.

Jan

> On Tue, Feb 23, 2016 at 1:37 PM, Francis Greaves <francis@xxxxxxxxxxx> wrote:
>> Dear All
>> I am using Centos 7 with Xen 4.6 on a Dell Poweredge T430 with (from lspci)
>> Matrox Electronics Systems Ltd. G200eR2 (rev 01) VGA
>>
>> 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 or shutdown.
>>
>> 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.
>> I have also tried with no settings for vga at all, and with and without
>> 'rhgb'
>> I have even tried bootscrub=false as suggested by the CentOS-virt mailing
>> list, but that does not work either. They suggested I asked you folk.
>>
>> What am I doing wrong?
>>
>> Regards
>> Francis
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx 
>> http://lists.xen.org/xen-users 




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