[Bug 104807] blank screen after drm initialization - trekstor twin 10.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104807

--- Comment #32 from hexdump <hexdump0815 at googlemail.com> ---
i have just attached a dmesg with drm.debug 0x1e from todays drm-tip (git hash
8e1dab6e913be7d014eb9bc355ec65b6b56dcd56) and the corresponding config. the
i915 module has been removed from initrd via dracut, so that it gets loaded
later (this is needed to make the backlight control work on this system). the
problem is still the same: the kernel boots and outputs fine until the i915
module gets loaded - then the screen goes blank. backlight control is fine (i
can change the brightness of the blank screen via
/sys/class/backlight/intel_backlight/brightness) - that is not the problem. it
seems to be more a problem of the panel initialization, as it works perfectly
well with a monitor attached to the mini-hdmi port and bootting without the
external monitor attached and the blank panel it seems to work, as the x-server
gets starts and initializes well and i can even login blindly at the blank
screen (i can see it when logging in remotely) - somehow the rendered screen is
not sent properly to the panel after the kms. with nomodeset everything is fine
- but of course all the nice things of kms are missing :)

a lot of thanks in advance and best wishes - hexdump

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