[coreboot] Question about Intel HD graphics and FLR

Zoran Stojsavljevic zoran.stojsavljevic at gmail.com
Thu Mar 30 13:29:37 CEST 2017

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 (
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?!


On Wed, Mar 29, 2017 at 10:49 PM, Joshua Pincus <joshua.pincus at gmail.com>

> 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
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