Hi, I'm testing the linux-next tree and I got this stack: [ 2.158054] Call Trace: [ 2.158058] [<ffffffff812b9159>] dump_stack+0x4b/0x72 [ 2.158061] [<ffffffff81074e62>] warn_slowpath_common+0x82/0xc0 [ 2.158063] [<ffffffff81074faa>] warn_slowpath_null+0x1a/0x20 [ 2.158066] [<ffffffffa0572291>] drm_dev_alloc+0x251/0x320 [drm] [ 2.158070] [<ffffffffa0574d0b>] drm_get_pci_dev+0x3b/0x1e0 [drm] [ 2.158081] [<ffffffffa07062d4>] i915_pci_probe+0x34/0x50 [i915] How is the best way to debug this ? I really need to add a print, compile and boot many times ? How would you guys debug this ? I know a way to boot two kernels, and the second get the dump from the first. But this isn't a Oops or Panic, it's just a warning. So the second kernel will not be triggered. Tips ? Thanks -- Lucas Tanure +55 (19) 988176559