I got this comment from Steven Chamberlain (Debian GNU/kFreeBSD developer):
On Sun, Apr 17, 2016 at 02:57:07PM +0100, Steven Chamberlain wrote: > Hi! > > (I'm not registered on Launchpad, so mailing you directly...) > > In reply to > https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1568104 > > it seems to be a problem with xserver-xorg-video-qxl, not the Xorg > server itself. > > Firstly: > > | [ 144.925] (II) [KMS] drm report modesetting isn't supported. > > may be expected, if the FreeBSD kernel does not have a KMS driver for > QXL. The detection happens in > http://sources.debian.net/src/libdrm/2.4.58-2/xf86drmMode.c/?hl=724#L776 > which mainly looks at a sysctl hw.dri.*.modesetting to ask the kernel of > KMS is enabled or not. (Maybe the original reporter could share his > output of `sysctl hw.dri` to confirm this). > > Without that, it falls back to some other mode of operation. It seems > to attempt some kind of direct memory-mapped I/O, and maybe that code is > unsuitable for kFreeBSD: > > | [ 145.095] (EE) Backtrace: > | [ 145.096] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x58cc8e] > | [ 145.096] (EE) 1: /usr/bin/X (0x400000+0x191009) [0x591009] > | [ 145.096] (EE) 2: ?? [0x7ffffffff043] > | [ 145.096] (EE) 3: /usr/lib/x86_64-kfreebsd-gnu/libpciaccess.so.0 > | (pci_io_write8+0x3) [0x80104e203] > | [ 145.096] (EE) 4: /usr/lib/xorg/modules/drivers/qxl_drv.so > | (0x8055a5000+0xb530) [0x8055b0530] > | [ 145.096] (EE) 5: /usr/lib/xorg/modules/drivers/qxl_drv.so > | (0x8055a5000+0x7811) [0x8055ac811] > > (Installing package xserver-xorg-video-qxl-dbg might give a more > detailed backtrace). > > However, if kFreeBSD doesn't support KMS with QXL, maybe it has no > advantage over plain VESA mode? I would consider disabling/uninstalling > the QXL driver, if it can't be easily fixed for kFreeBSD. Then Xorg > would fall back to VESA mode and not crash. > > Regards, > -- > Steven Chamberlain > ste...@pyro.eu.org -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1568104 Title: Xorg Needs KVM Support within UbuntuBSD Status in xorg-server package in Ubuntu: New Bug description: When starting X in a KVM instance on UbuntuBSD, Xorg crashes with the following log: http://paste.ubuntu.com/15696451/ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1568104/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
