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Date: Fri, 12 Jul 2013 10:52:27 +0800 From: Dave Young <dyoung@...hat.com> To: Takao Indoh <indou.takao@...fujitsu.com> CC: airlied@...ux.ie, vgoyal@...hat.com, bhe@...hat.com, chaowang@...hat.com, linux-kernel@...r.kernel.org, ishii.hironobu@...fujitsu.com Subject: Re: PCIE resetting graphic card 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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