On Sun, Mar 17, 2013 at 11:21 AM, Michael Zimmermann <michaelz at ib-mz.com> wrote: > I own a Dell XPS 12 with an IvyBridge Graphic card, a Mini DisplayPort and > an internal display which is accessible via eDP1. So far the only chance to > get this machine running properly with Ubuntu 12.10 64-bit is to set > acpi=off as boot parameter with all the disadvantages of not having the ACPI > features. Without the setting the screen is blank (=black), but I hear the > drumsticks and can access the machine via ssh. Checking dmesg and Xorg.0.log > gives no serious hint of having a problem. Astonishingly if I plug in an > external monitor I can see the normal ubuntu user interface on it and work > with it, where the monitor of the laptop remains blank. As far as I can see > ACPI and the graphic card work well except for not detecting eDP1 as the > device of choice then ACPI is turned on. Turning off ACPI means that the > kernel starts SFI (Simple firmware interface) which does not have the > problem and that works. I would like to get the ACPI features, especially > power management and cpu usage, which is quite essential on a laptop, > running so I would like to ask you for advice, if there is any possibility > for solving this you may be the right person having the internals of > tweaking the i915. Please test with the latest released kernels (3.8.x) and preferrably also with latest drm-intel-nightly (ubuntu has a nice ppa at http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-experimental/). If that's still broken please file a bug report at bugs.freedesktop.org against dri -> drm (Intel). Also when poking please never only send a mail to your maintainer, but always cc a mailing list (since he might be on vacation or just really busy). Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
