[Bug 60643] [i915] black screen at boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60643

--- Comment #2 from MDBürkle <dominik.buerkle at web.de> ---
Created attachment 107127
  --> https://bugzilla.kernel.org/attachment.cgi?id=107127&action=edit
dmesg.gz from a boot of a kernel with CONFIG_DRM_I915=m and
CONFIG_DRM_I915_KMS=y and /etc/modprobe.d/test.conf:options i915 modeset=1

Additionally, please NOTE:

 - it's a gentoo-kernel (3.10.2-gentoo) (though these are close to vanilla)

 - two lines were commented out in these runs (not to turn the backlight off)
   in drivers/gpu/drm/i915/i915_drv.c, lines 550+551,
                //list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
                //      dev_priv->display.crtc_disable(crtc);

 - fglrx.ko was renamed to fglrx.ko_off to prevent auto-loading of the module
   and xdm-service was turned off, too

 - loading of fglrx.ko made no difference (with or without fglrx, 
   the results were the same: only dependent on .config value DRM_I915_KMS)

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