Re: PCIE resetting graphic card

[Dave Young <dyoung@redhat.com>]

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