Re: 2.6.38-rc7/rc8 no output on VGA under xen

Re: 2.6.38-rc7/rc8 no output on VGA under xen

[Andreas Olsowski]

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After another day of testing i have not managed to get this working.
I even tried totally different hardware, the console stays dark.
The blinking cursor i only get when i am starting with serial console.

So output is possible, its just not done.

Is 2.6.38 somehow incompatible with the hypervisor?

Today on irc someone said he had the same problem with 2.6.37.

Please tell me if you are experiencing the same problems or if you dont, 
please send me a link to your kernel .config.

Best regards

-- 
Andreas Olsowski


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Re: 2.6.38-rc7/rc8 no output on VGA under xen

[Konrad Rzeszutek Wilk]

On Tue, Mar 15, 2011 at 06:08:48PM +0100, Andreas Olsowski wrote:
> After another day of testing i have not managed to get this working.
> I even tried totally different hardware, the console stays dark.

And what is the lspci off the different hardware? What is the
diff between the original hardware and this hardware?

> The blinking cursor i only get when i am starting with serial console.

And you did follow the PVOPS Wiki on troubleshooting and using
"console=hvc0 debug"
> 
> So output is possible, its just not done.
> 
> Is 2.6.38 somehow incompatible with the hypervisor?

No. The issue is (and I explained this to you on irc) is that the video
driver you have is an PCI/AGP type. The patchset to make the 2.6.38
(devel/agp.pci-api) haven't been up-ported to the 2.6.38 tree. In essence
the code to make this work is not there. The 2.6.32 has this code.

> 
> Today on irc someone said he had the same problem with 2.6.37.

Uhh.. yeah that is expected. There are no patches in the 2.6.37 tree
to make it work.

> 
> Please tell me if you are experiencing the same problems or if you
> dont, please send me a link to your kernel .config.

You got three options:
 - Stick in a PCI-e discrete graphic card. Say Radeon el-cheapo. See how
   that works.
 - Make sure to disable the MGA driver from the kernel and only use
   the VESA/VGA framebuffer. That _should_ be working. If it is is not
   please send an e-mail here.
 - Back-port yourself the #devel/agp.pci-api in the 2.6.38 kernel.
   There is going to be a compile fallout somewhere in the drivers/gpu/drm/intel,
   but you could patch that over by just passing a NULL pointer.

My .config is basically using the Ubuntu 11.04 config will XEN_ options turned
into =y. But that won't help you in this case.

Re: 2.6.38-rc7/rc8 no output on VGA under xen

[Konrad Rzeszutek Wilk]

On Wed, Mar 16, 2011 at 10:01:10AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Mar 15, 2011 at 06:08:48PM +0100, Andreas Olsowski wrote:
> > After another day of testing i have not managed to get this working.
> > I even tried totally different hardware, the console stays dark.

What git branch are you using? On IRC I see you are talking about stock
(which certaintly won't work right)?

Re: 2.6.38-rc7/rc8 no output on VGA under xen

[Pasi Kärkkäinen]

On Wed, Mar 16, 2011 at 12:59:22PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, Mar 16, 2011 at 10:01:10AM -0400, Konrad Rzeszutek Wilk wrote:
> > On Tue, Mar 15, 2011 at 06:08:48PM +0100, Andreas Olsowski wrote:
> > > After another day of testing i have not managed to get this working.
> > > I even tried totally different hardware, the console stays dark.
> 
> What git branch are you using? On IRC I see you are talking about stock
> (which certaintly won't work right)?
> 

Some people have reported this problem also with xen/stable-2.6.32.x ..

-- Pasi