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

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Message-ID: <5318ED51.4060400@yahoo.com>
Date:	Thu, 06 Mar 2014 16:49:05 -0500
From:	Brian Wong <draconicpenguin1@...oo.com>
To:	KY Srinivasan <kys@...rosoft.com>, 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?
>
> 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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