From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757089AbcC2MBS (ORCPT ); Tue, 29 Mar 2016 08:01:18 -0400 Received: from mail-wm0-f41.google.com ([74.125.82.41]:38415 "EHLO mail-wm0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757045AbcC2MBP (ORCPT ); Tue, 29 Mar 2016 08:01:15 -0400 Date: Tue, 29 Mar 2016 14:01:18 +0200 From: Daniel Vetter To: Florian Zumbiehl Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Daniel Vetter , Jani Nikula , David Airlie Subject: Re: blank screen on boot with i915/DRM_FBDEV_EMULATION Message-ID: <20160329120118.GW2510@phenom.ffwll.local> Mail-Followup-To: Florian Zumbiehl , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Daniel Vetter , Jani Nikula , David Airlie References: <20160326112122.GF13320@florz.florz.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160326112122.GF13320@florz.florz.de> X-Operating-System: Linux phenom 4.4.0-1-amd64 User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 26, 2016 at 12:21:23PM +0100, Florian Zumbiehl wrote: > 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? FBDEV_EMULATION vs. I915_FBDEV is probably a read herring, more likely is that for some odd reason the very first modeset fails. Once X has resurrect the screen, can you then switch to fbcon? Also please check in /sys/class/vtconsole whether the fbdev driver is loaded and bound (check the name and bind files). And make sure there's that dmesg still says it initialized the "inteldrmfb" driver. If that all indicates fbcon is running properly, then it's time to bisect what exactly broke the initial modeset for your system. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: blank screen on boot with i915/DRM_FBDEV_EMULATION Date: Tue, 29 Mar 2016 14:01:18 +0200 Message-ID: <20160329120118.GW2510@phenom.ffwll.local> References: <20160326112122.GF13320@florz.florz.de> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <20160326112122.GF13320@florz.florz.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Florian Zumbiehl Cc: David Airlie , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Daniel Vetter List-Id: dri-devel@lists.freedesktop.org T24gU2F0LCBNYXIgMjYsIDIwMTYgYXQgMTI6MjE6MjNQTSArMDEwMCwgRmxvcmlhbiBadW1iaWVo bCB3cm90ZToKPiBIaSwKPiAKPiBJIGp1c3QgY29tcGlsZWQgYSBuZXcga2VybmVsIHZlcnNpb24g NC40LjUsIHJlcGxhY2luZyBhIHByZXZpb3VzIDQuMS45IGZvcgo+IG15IHRoaW5rcGFkIHg0MCwg d2hpY2ggcmVwbGFjZWQgQ09ORklHX0RSTV9JOTE1X0ZCREVWIHdpdGgKPiBDT05GSUdfRFJNX0ZC REVWX0VNVUxBVElPTi0tbm93LCB3aGVuIHRoZSBpOTE1IGFuZCBmYmNvbiBtb2R1bGVzIGdldCBs b2FkZWQKPiBkdXJpbmcgYm9vdCwgdGhlIHNjcmVlbiBnb2VzIGJsYW5rICh3aXRoIGJhY2tsaWdo dCBzdGlsbCBvbiksIHdoaWNoIGRpZG4ndAo+IGhhcHBlbiB3aXRoIHRoZSBvbGQga2VybmVsLgo+ IAo+IFRoZSBmdW5ueSB0aGluZyBpcyB0aGF0IHN0YXJ0aW5nIGFuIFggc2VydmVyIG1ha2VzIHRl eHQgcmVhcHBlYXIgb24gdGhlCj4gY29uc29sZSE/IChBbmQgdGhlIFggc2VydmVyIGFsc28gd29y a3MganVzdCBmaW5lLCBhcyBmYXIgYXMgSSBjYW4gdGVsbCBzbwo+IGZhciAuLi4pCj4gCj4gaTkx NSBpcyBsb2FkZWQgd2l0aCBtb2Rlc2V0PTEgKEkgcmVtZW1iZXIgSSBoYWQgc29tZSBwcm9ibGVt IHdpdGhvdXQgaXQKPiB3aXRoIHNvbWUgZWFybGllciBrZXJuZWxzLCBJIGRvbid0IHJlYWxseSBy ZW1lbWJlciB0aGUgZGV0YWlscyBhbnltb3JlCj4gLi4uKS4KPiAKPiBBbnkgaGludHMgd2hhdCB0 byB0cnk/IEFueSBmdXJ0aGVyIGluZm9ybWF0aW9uIHRoYXQgY291bGQgYmUgdXNlZnVsPwoKRkJE RVZfRU1VTEFUSU9OIHZzLiBJOTE1X0ZCREVWIGlzIHByb2JhYmx5IGEgcmVhZCBoZXJyaW5nLCBt b3JlIGxpa2VseSBpcwp0aGF0IGZvciBzb21lIG9kZCByZWFzb24gdGhlIHZlcnkgZmlyc3QgbW9k ZXNldCBmYWlscy4gT25jZSBYIGhhcwpyZXN1cnJlY3QgdGhlIHNjcmVlbiwgY2FuIHlvdSB0aGVu IHN3aXRjaCB0byBmYmNvbj8gQWxzbyBwbGVhc2UgY2hlY2sgaW4KL3N5cy9jbGFzcy92dGNvbnNv bGUgd2hldGhlciB0aGUgZmJkZXYgZHJpdmVyIGlzIGxvYWRlZCBhbmQgYm91bmQgKGNoZWNrCnRo ZSBuYW1lIGFuZCBiaW5kIGZpbGVzKS4gQW5kIG1ha2Ugc3VyZSB0aGVyZSdzIHRoYXQgZG1lc2cg c3RpbGwgc2F5cyBpdAppbml0aWFsaXplZCB0aGUgImludGVsZHJtZmIiIGRyaXZlci4KCklmIHRo YXQgYWxsIGluZGljYXRlcyBmYmNvbiBpcyBydW5uaW5nIHByb3Blcmx5LCB0aGVuIGl0J3MgdGlt ZSB0byBiaXNlY3QKd2hhdCBleGFjdGx5IGJyb2tlIHRoZSBpbml0aWFsIG1vZGVzZXQgZm9yIHlv dXIgc3lzdGVtLgotRGFuaWVsCi0tIApEYW5pZWwgVmV0dGVyClNvZnR3YXJlIEVuZ2luZWVyLCBJ bnRlbCBDb3Jwb3JhdGlvbgpodHRwOi8vYmxvZy5mZndsbC5jaApfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVs LWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcv bWFpbG1hbi9saXN0aW5mby9pbnRlbC1nZngK