No, with nomodeset I don't have the softlockup and I can boot, but Xorg does not load the radeon driver. The kernel logs some radeon errors
$ dmesg | grep drm [ 6.139753] [drm] Initialized drm 1.1.0 20060810 [ 6.173103] [drm] VGACON disable radeon kernel modesetting. [ 6.173153] [drm:radeon_init] *ERROR* No UMS support in radeon module! [ 50.032476] [drm] VGACON disable radeon kernel modesetting. [ 50.032494] [drm:radeon_init] *ERROR* No UMS support in radeon module! [ 89.408520] [drm] VGACON disable radeon kernel modesetting. [ 89.408526] [drm:radeon_init] *ERROR* No UMS support in radeon module! Here's Xorg.log. It tries to load radeon, but then in unloads it. https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4296840/+files/Xorg.0.log I also checked the bios and yes, the IGP is disabled and the setting is set to start from the PCI Express slot. 2015-01-12 21:48 GMT+00:00 Alex Deucher <alexdeucher at gmail.com>: > On Sun, Jan 11, 2015 at 3:27 PM, Federico <federicotg at gmail.com> wrote: > > Ubuntu 14.10 (kernel is 3.16.0) with nomodeset also boots. But it seems > to > > be using the a generic driver > > Right. As I mentioned, using nomodeset disables the gfx driver and > you end up with fw drivers (vesa of efifb). Do you still have the > issue even with nomodeset as you previously stated? > > Alex > > > > > cat /var/log/kern.log | grep ERROR > > Jan 11 20:07:56 ubuntu kernel: [ 6.174086] [drm:radeon_init] *ERROR* > No > > UMS support in radeon module! > > Jan 11 20:07:56 ubuntu kernel: [ 54.093686] [drm:radeon_init] *ERROR* > No > > UMS support in radeon module! > > Jan 11 20:08:10 ubuntu kernel: [ 94.983647] [drm:radeon_init] *ERROR* > No > > UMS support in radeon module! > > > > glxinfo | grep Open > > OpenGL vendor string: VMware, Inc. > > OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.5, 128 bits) > > OpenGL version string: 3.0 Mesa 10.3.0 > > OpenGL shading language version string: 1.30 > > OpenGL context flags: (none) > > OpenGL extensions: > > > > > > 2015-01-11 19:44 GMT+00:00 Federico <federicotg at gmail.com>: > >> > >> > >> > >> 2015-01-11 14:19 GMT-03:00 Alex Deucher <alexdeucher at gmail.com>: > >>> > >>> Booting with nomodeset disables the graphics drivers so if you are > >>> still getting problems, it may a hardware problem. Can you attach > >>> your full dmesg and lspci output? Are you disabling the onboard > >>> graphics when enabling the external dGPU? > >>> > >>> Alex > >> > >> > >> I attached those outputs to > >> https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973 > >> I wasn't sure if you meant attaching to this response. > >> > >> I was able to boot with nomodeset into Ubuntu 15.04's image. I get to a > >> graphic log in screen, but I also get some errors in the kernel log > >> > >> [drm:radeon_init] *ERROR* No UMS support in radeon module! > >> > >> Which seems by design so I assume the VESA driver was in use. > >> > >> I will try to boot Ubuntu 14.10 live image with nomodeset to see if I > can > >> get some error messages there. > > > > > > > > _______________________________________________ > > dri-devel mailing list > > dri-devel at lists.freedesktop.org > > http://lists.freedesktop.org/mailman/listinfo/dri-devel > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20150112/7cc0f763/attachment.html>