On Mon, 2011-05-09 at 13:14 +0200, Jan Kiszka wrote: > On 2011-05-05 17:17, Alex Williamson wrote: > >> And what about the host? When does Linux release the legacy range? > >> Always or only when a specific (!=vga/vesa) framebuffer driver is loaded? > > > > Well, that's where it'd be nice if the vga arbiter was actually in more > > widespread use. It currently seems to be nothing more than a shared > > mutex, but it would actually be useful if it included backends to do the > > chipset vga routing changes. I think when I was testing this, I was > > externally poking PCI bridge chipset to toggle the VGA_EN bit. > > Right, we had to drop the approach to pass through the secondary card > for now, the arbiter was not switching properly. Haven't checked yet if > VGA_EN was properly set, though the kernel code looks like it should > take care of this. > > Even with handing out the primary adapter, we had only mixed success so > far. The onboard adapter worked well (in VESA mode), but the NVIDIA is > not displaying early boot messages at all. Maybe a vgabios issue. > Windows was booting nevertheless - until we installed the NVIDIA > drivers. Than it ran into a blue screen. Interesting, IIRC I could never get VESA modes to work. I believe I only had a basic VGA16 mode running in a Windows guest too. > BTW, what ATI adapter did you use precisely, and what did work, what not? I have an old X550 (rv380?). I also have an Nvidia gs8400, but ISTR the ATI working better for me. > One thing I was wondering: Most modern adapters should be PCIe these > days. Our NVIDIA definitely is. But so far we are claiming to have it > attached to a PCI bus. That caps all the extended capabilities e.g. > Could this make some relevant difference? The BIOS and early boot use shouldn't care too much about that, but I could imagine the high performance drivers potentially failing. Thanks, Alex -- 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
