Bug report: i915 screens stay blank with 3.8.3, ok with 3.8.2

[Daniel Vetter]

On Sat, Mar 16, 2013 at 01:04:34PM +0100, Stephan Boettcher wrote:
> 
> Moin,
> 
> [1.] One line summary of the problem:
> 
>    Both screens stay blank during boot with 3.8.3.
> 
> [2.] Full description of the problem/report:
> 
>    When booting the screens go blank soon after showing the grub menu.  
>    Starting X11 does not bring the screens up either.
>    In /var/log/dmesg two lines appear (diff -u):
> 
> @@ -432,8 +434,10 @@
>  [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
>  [drm] Driver supports precise vblank timestamp query.
>  vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
> +i915 0000:00:02.0: No connectors reported connected with modes
> +[drm] Cannot find any crtc or sizes - going 1024x768
>  fbcon: inteldrmfb (fb0) is primary device
> -Console: switching to colour frame buffer device 240x75
> +Console: switching to colour frame buffer device 128x48
>  i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
>  i915 0000:00:02.0: registered panic notifier
>  i915: No ACPI video bus found

Can you please file a bug report against bugs.freedesktop.org. Please boot
both broken and working kernel with drm.debug=0xe added to your kernel
cmdline and attach the complete dmesg of each to the bug report.

If you can do a quick bisect to figure out the offending commit, that
would be good, too. And can you please also check whether the latest
3.9-rc kernel is affect? We need to know that since stable rules mandate
that regressions in stable kernels can only be fixed once upstream is
known to work.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch