On Sat, Feb 13, 2016 at 06:03:31PM -0700, Alex Williamson wrote: > On Sat, 13 Feb 2016 19:20:32 -0500 > "Kevin O'Connor" <kevin@xxxxxxxxxxxx> wrote: > > This confuses me - why didn't the host system BIOS turn on the LCD > > panel during host bootup? > > It turns off when we reset the device between VM instances or between > VM boots. IGD supports Function Level Reset (FLR). > > > >Another desktop IvyBridge system > > > doesn't really care about the vBIOS so long as we don't ask it to > > > output anything before the guest native drivers are loaded. If we > > > could, I think we'd just enable vBIOS for laptop panel support, but > > > that's really not an option, it's going to run as a boot option ROM as > > > well, so we need to fix the issues that it generates there. > > > > From my experience with coreboot, running the vga option rom multiple > > times during a given boot is very fragile. (By multiple times, I mean > > either the host running it and then a guest, or running it multiple > > times from multiple guests.) YMMV. > > We do this regularly for graphics assignment, Nvidia, AMD, and now > Intel. It generally works ok. Perhaps you've seen issues with the > option ROM being run multiple times without resetting the device. I > could certainly believe that. Interesting. Using the FLR could be useful on some coreboot systems where users want to run the option rom twice. Thanks. -Kevin -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
