linux-kernel - blank screen on boot with i915/DRM_FBDEV

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160326112122.GF13320@florz.florz.de>
Date:	Sat, 26 Mar 2016 12:21:23 +0100
From:	Florian Zumbiehl <florz@...rz.de>
To:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>
Subject: blank screen on boot with i915/DRM_FBDEV_EMULATION

Hi,

I just compiled a new kernel version 4.4.5, replacing a previous 4.1.9 for
my thinkpad x40, which replaced CONFIG_DRM_I915_FBDEV with
CONFIG_DRM_FBDEV_EMULATION--now, when the i915 and fbcon modules get loaded
during boot, the screen goes blank (with backlight still on), which didn't
happen with the old kernel.

The funny thing is that starting an X server makes text reappear on the
console!? (And the X server also works just fine, as far as I can tell so
far ...)

i915 is loaded with modeset=1 (I remember I had some problem without it
with some earlier kernels, I don't really remember the details anymore
...).

Any hints what to try? Any further information that could be useful?

Regards, Florian