From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mario <mario@slackverse.org>
Subject: Re: PV networking issue in 2.6.38.6 and 2.6.39-rc7	pvops
	dom0 kernels
Date: Tue, 17 May 2011 12:49:18 +0200
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To: =?ISO-8859-1?Q?Pasi_K=E4rkk=E4inen?= <pasik@iki.fi>
Cc: Ian Campbell <Ian.Campbell@eu.citrix.com>, "todd.deshane@xen.org" <todd.deshane@xen.org>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "xen-users@lists.xensource.com" <xen-users@lists.xensource.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
List-Id: xen-devel@lists.xenproject.org

On 05/16/2011 03:22 PM, Pasi K=E4rkk=E4inen wrote:
> On Mon, May 16, 2011 at 03:15:53PM +0200, Mario wrote:
>> On 05/16/2011 03:09 PM, Mario wrote:
>>> On 05/16/2011 03:06 PM, Ian Campbell wrote:
>>>> On Mon, 2011-05-16 at 14:04 +0100, Mario wrote:
>>>>> So you are telling me that 2.6.38 does not have a working networkin=
g on
>>>>> PV guests, but HVM does?
>>>>
>>>> Yes, netback did not go upstream until 2.6.39 so PV networking (eith=
er
>>>> for PV or HVM guests with PV drivers) will not work on mainline kern=
els
>>>> before that.
>>>>
>>>> Emulated HVM networking does not use netback so that will work on
>>>> earlier kernels (it depends on qemu)
>>>>
>>>> Ian.
>>>>
>>>
>>> Ok, thanks, it all makes more sense now. :-)
>>
>>
>> Ian, while i have your attention, any idea why some framebuffer device=
s
>> blank screen when dom0 boots up. I have seen this happen mostly on old=
er
>> vga cards but its not a rule. Should i just keep on blacklisting kerne=
l
>> modules for those cards, or is there some kind of a more general
>> solution?
>
> You could try "nomodeset" parameter to disable KMS modesetting..
> (and possibly adding "console=3Dtty0")
>
> Xen patches for DRM/KMS haven't been merged to upstream Linux yet.
>
> -- Pasi
>


nomodeset and/or nofb do not seem to help.
console=3Dtty0 also does not seem to have any effect.

Only way to successfuly boot dom0 is with one of these:

CONFIG_FB=3Dn

or

echo "blacklist s3fb" > /etc/modprobe.d/blacklist-s3fb.conf

As soon as fb device is modprobed, booting stops, and server freezes.
Can anything else be done? Perhaps some setting for xen in kernel..?