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

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Message-ID: <366171544ed34d909b113328d2ed2e64@BY2PR03MB299.namprd03.prod.outlook.com>
Date:	Thu, 6 Mar 2014 21:50:51 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Brian Wong <draconicpenguin1@...oo.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
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.

Regards,

K. Y
> >
> > Just to clarify, I can confirm this bug under both the patched Gentoo
> > 3.10.32 kernel and the vanilla 3.13.5 kernel (see the image at
> > http://imgur.com/mYUTzgt). Is the framebuffer somehow getting
> corrupted?
> >
> 
> The problem also reproduces under Kali Linux with kernel 3.12.6, but only on
> virtual consoles that are not hosting a graphical X session. The problem does
> not appear in X.
> 
> --
> Brian Wong
> http://www.fierydragonlord.com
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