Message-ID: <51DF6F6B.9050809@redhat.com>
Date: Fri, 12 Jul 2013 10:52:27 +0800
From: Dave Young <dyoung@redhat.com>
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To: Takao Indoh <indou.takao@jp.fujitsu.com>
CC: airlied@linux.ie, vgoyal@redhat.com, bhe@redhat.com, chaowang@redhat.com,
        linux-kernel@vger.kernel.org, ishii.hironobu@jp.fujitsu.com
Subject: Re: PCIE resetting graphic card
References: <51DF6446.9090105@redhat.com> <51DF6C5D.1020904@jp.fujitsu.com>
In-Reply-To: <51DF6C5D.1020904@jp.fujitsu.com>
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Hi, Takao
On 07/12/2013 10:39 AM, Takao Indoh wrote:
> Hi Dave,
> 
> (2013/07/12 11:04), Dave Young wrote:
>> Hi, Takao
>>
>> I know you are working on the PCIE resetting patches for the iommu kdump
>> issue.
>>
>> You explicitly excluded the graphic card in your patch. I have some
>> questions about this. Why can't we reset the graphic card like other
>> pcie devices?
> 
> As far as I tested, the monitor blacks out after video controller is
> reset, and we cannot know what's going on. So, for now display device is
> not reset in my patch.
> 
> I'm not sure what we need to do to recover graphic card after its reset,
> but my colleague said that we need to run BIOS code to get back legacy
> VGA mode after reset. It seems not to be easy:-(
> 
> Maybe this document is helpful to do this.
> http://www.coreboot.org/images/2/2b/Vgabios.pdf

Thanks for quick response and the info about vgabios. It's awkward that
we can not switch back to VGA mode.

-- 
Thanks
Dave
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