Hi Zoran, So long as you don't have to kill anyone to get the info, I genuinely appreciate the help. JP
On Thu, Mar 30, 2017 at 9:54 AM, Zoran Stojsavljevic < [email protected]> wrote: > OK, Joshua! > > I do not promise anything. But I, out of (your) desperation, will try to > find answers for you. If (no promise)... > > If I (eventually) return back, I have only one condition for you: NEVER > ask how I found (any future) answer for/to you! > > Thank you, > Zoran > > On Thu, Mar 30, 2017 at 5:48 PM, Joshua Pincus <[email protected]> > wrote: > >> Hi Zoran, >> >> Thanks for your reply. >> >> My situation is this: When the VM guest comes up the first time from a >> system-level reset (aka power on), the Broadwell HD graphics device runs >> fine. I see basic VGA both before and during the boot of Windows. Once >> Windows boots, the HD graphics device is configured by Intel's driver and I >> see hi-rez output. On a reboot of Windows within the VM, an FLR is >> issued. When the guest comes back up, no VGA. Windows does boot but >> provides no VGA output. If Windows needs to drop into VGA mode so that a >> user can access the real-mode functionality of the recovery console, still >> no VGA. >> >> It's only on Broadwell-based boards that we have this problem. If we >> issue FLRs during the reset of the PCI bus for older Intel boards, no >> problem. We get VGA. Something involved with the FLR is messing up the >> state of the hardware instead of actually returning the hardware to a >> virgin state, akin to what you would get from a full system reset. >> >> I was wondering if anyone had seen this kind of behavior. We've tried >> everything. We've manipulated all of the obvious HD graphics MMIO >> registers involved with restoring VGA but nothing seems to work. >> >> Thanks, >> JP >> >> On Thu, Mar 30, 2017 at 4:29 AM, Zoran Stojsavljevic < >> [email protected]> wrote: >> >>> Hello Joshua, >>> >>> I'll ask similar question, considering UEFI (BIOS). I have no idea if >>> you can issue somehow easy FLR (PCI Function Level Reset), but if you >>> can, does this use case repeat itself? >>> >>> I found, related to BIOS, this pointer (http://www.tomshardware.co.uk >>> /forum/278002-30-solved-what-capability-option-bios), since I do NOT >>> recall this option in any (legacy and UEFI) of the BIOSes I used (and I >>> used lot (>100) of them). Probably, did not pay too much attention, since I >>> do not recall this option to be tested/used?! >>> >>> Zoran >>> >>> On Wed, Mar 29, 2017 at 10:49 PM, Joshua Pincus <[email protected] >>> > wrote: >>> >>>> Hi, >>>> >>>> After performing just an FLR (PCI function level reset) of a Gen8 Intel >>>> HD graphics device, there's no VGA output from the device, no matter what I >>>> try to do. I've had coreboot reset the graphics control register, VGA >>>> control, VGA display disable bit, etc. >>>> >>>> Has anyone seen anything like this? The only way I can get VGA >>>> restored is by performing a system-level reset. But I just want to do an >>>> FLR. Any ideas? >>>> >>>> Thanks, >>>> JP >>>> >>>> -- >>>> coreboot mailing list: [email protected] >>>> https://www.coreboot.org/mailman/listinfo/coreboot >>>> >>> >>> >> >
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