Created attachment 106845 [details] Dmesg illustrating the problem I have a 3.10-rc7 kernel plus radeon-related patches from branch 'drm-next-3.11-wip-4' of git://people.freedesktop.org/~agd5f/linux My laptop has both an Intel graphics chip in itself and a Radeon chip in a hot-pluggable dock station. Both graphics cards have usable outputs. So I was playing with xrandr --setprovideroffloadsink and --setprovideroutputsource. By doing so, I was able to cause a deadlock in the i915 driver. I am going to attach a dmesg that illustrates it.
Known issue with the current prime code, we need w/w mutexes (now mergd into latest git) and a completely reworking locking in drm/i915 (not even started yet). This will take a while to fix.
Daniel, have we finally fixed this?
No, still need to rewrite half the driver ... The nouveau/radeon side of this little project from Maarten is merged into 3.18 though.
If the problem persists with latest kernels, please file a bug at the freedesktop.org bugzilla [1], referencing this bug. Thank you. [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel