On 5/9/14, 5:41, "Jani Nikula" <jani.nikula@xxxxxxxxx> wrote: >Media force wake get hangs the machine when the system is booted without >displays attached. The assumption is that (at least some versions of) >the firmware has skipped some initialization in that case. > >Empirical evidence suggests we need to reset the media force wake >request register in addition to the render one to avoid hangs. > >Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75895 >Reported-by: Imre Deak <imre.deak@xxxxxxxxx> >Reported-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx> >Cc: stable@xxxxxxxxxxxxxxx >Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Applied to 3.14.2 and tested on MinnowBoardMax A0 hardware (BayTrail-I, Atom E3825). * With no display connected, the boot no longer hangs and DRM prints sensible messages during boot: [ 5.968837] [drm] GMBUS [i915 gmbus vga] timed out, falling back to bit banging on pin 2 [ 5.988037] i915 0000:00:02.0: No connectors reported connected with modes [ 5.995744] [drm] Cannot find any crtc or sizes - going 1024x768 [ 6.004716] fbcon: inteldrmfb (fb0) is primary device [ 6.013066] Console: switching to colour frame buffer device 128x48 [ 6.034147] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ 6.041168] i915 0000:00:02.0: registered panic notifier [ 6.049820] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) [ 6.058788] acpi device:30: registered as cooling_device3 [ 6.065111] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input4 [ 6.075370] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 * If a display is subsequently connected and X is restarted, it behaves as expected. * Booting with a display connected continue to work as expected. Tested-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx> Thank you very much Jani! -- Darren Hart Open Source Technology Center darren.hart@xxxxxxxxx Intel Corporation _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
