linux-kernel - RE: Hyper-V Synthetic Video Frame Buffer Driver may distort top two lines of console

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Message-ID: <129cf9d54a4c4ba68f4f70725299b9c8@DFM-DB3MBX15-06.exchange.corp.microsoft.com>
Date:	Thu, 6 Mar 2014 22:08:19 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	Brian Wong <draconicpenguin1@...oo.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Hyper-V Synthetic Video Frame Buffer Driver may distort top two
 lines of console



> -----Original Message-----
> From: KY Srinivasan
> Sent: Thursday, March 6, 2014 4:51 PM
> To: Brian Wong; linux-kernel@...r.kernel.org; Haiyang Zhang
> Subject: RE: Hyper-V Synthetic Video Frame Buffer Driver may distort top
> two lines of console
> 
> 
> 
> > -----Original Message-----
> > From: Brian Wong [mailto:draconicpenguin1@...oo.com]
> > Sent: Friday, March 7, 2014 3:19 AM
> > To: KY Srinivasan; linux-kernel@...r.kernel.org
> > Subject: Re: Hyper-V Synthetic Video Frame Buffer Driver may distort
> > top two lines of console
> >
> > On 3/6/2014 4:05 PM, Brian Wong wrote:
> > > On 3/6/2014 3:41 PM, Brian Wong wrote:
> > >> I've identified another possible bug in the Hyper-V drivers: When
> > >> the Hyper-V Synthetic Video Frame Buffer Driver is built into the
> > >> kernel, and the VM is paused and continued, the top two lines of
> > >> the console may become distorted. See the image at
> http://imgur.com/kIExFP3.
> > >>
> > >> Can someone look into it?
> Haiyang (copied here) will look into it.
> 

It's a known issue. The root cause is not very clear yet.
It doesn't affect system functions. But we will look into it 
further.

Thanks,
- Haiyang

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