Hi, On 30-09-16 10:28, Hans de Goede wrote: > Hi, >
<snip> > Xorg when running without a Xorg.conf searches for what it considers > a "primary" gpu / video-card, basically it attempts to bring up the > right card in setups where there are multiple cards and if it does not > find one exits with an error. > > The xserver has a 2 step process for finding the primary card: > > 1) It searches for is a card which has a vga-bios mapped, > as we've already determined in the mentioned Red Hat bug that works for > the classic qemu emulated video-cards, but not for qemu's virtio-vga. > > 2) If that does not work Xorg will fallback to any video class device > on pci-bus 1. > > This fallback actually has been broken in the Xorg xserver for quite a > while now and only 2 days ago a patch from Laszlo was merged to fix this. > > Only for things to break again due to this kernel patch. > > Since the whole step 2) thingie is very much tied to x86 machines > where pci-bus 0 used to be the main bus and pci-bus 1 the agp, > which is sorta an obsolete assumption now a days and since relying > on bus numbers / enumeration order is a bad idea in general I'm not > entirely sure if this counts as a regression. > > I've discussed the problem of the xserver exiting with an error when > no primary device can be found with some people (ajax) at XDC last week > since there are other use-cases where the pci-bus 1 fallback does not > work. > > As such I've been working on a xserver patch-set to make the xserver > try harder (pick the first available device) when both steps described > above fail to find one, which should make things work even with the > newest (broken / regressed) kernels. > > Given this mail thread, I guess I'm working after all today (I had > planned a day off) and I'll try to wrap up this patch-set and reply > to this mail with the server patches attached for Joachim and/or > Laszlo to test. Attached are 2 patches against the xserver which should fix this, please give them a try. Regards, Hans -------------- next part -------------- A non-text attachment was scrubbed... Name: 0001-xfree86-Make-adding-unclaimed-devices-as-GPU-devices.patch Type: text/x-patch Size: 2991 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20160930/4347f82b/attachment.bin> -------------- next part -------------- A non-text attachment was scrubbed... Name: 0002-xfree86-Try-harder-to-find-atleast-1-non-GPU-Screen.patch Type: text/x-patch Size: 4701 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20160930/4347f82b/attachment-0001.bin>
