Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754528AbaDUUyR (ORCPT ); Mon, 21 Apr 2014 16:54:17 -0400 Received: from mail-qc0-f175.google.com ([209.85.216.175]:36678 "EHLO mail-qc0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754467AbaDUUyP (ORCPT ); Mon, 21 Apr 2014 16:54:15 -0400 MIME-Version: 1.0 In-Reply-To: <20140421203207.GA27025@milliways> References: <20140421203207.GA27025@milliways> Date: Mon, 21 Apr 2014 16:54:15 -0400 Message-ID: Subject: Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display From: Alex Deucher To: Ken Moffat Cc: LKML Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 21, 2014 at 4:32 PM, Ken Moffat wrote: > I've just built 3.15.0-rc2 on this box, and discovered that I get a > blank screen. The boot appears to complete (it sends me information > from SMART which is from my last bootscript), and it responds to > MagicSysRQ to reboot. I tried to login and run startx, but that > didn't seem to make any difference - possibly something went wrong, > it wasn't in my history when I booted a good kernel. > > This machine uses a regular old VGA cable to connect it, the > following lines in dmesg make me think it has chosen the wrong > connector: VGA is implemented as a DP to VGA bridge on APUs. > > Apr 21 19:32:45 bluesbreaker kernel: [ 1.273246] > [drm:radeon_dp_link_train_cr] *ERROR* displayport link status failed > Apr 21 19:32:45 bluesbreaker kernel: [ 1.273247] > [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed > Apr 21 19:32:45 bluesbreaker kernel: [ 1.295116] Console: > switching to colour frame buffer device 85x34 > > On a boot with 3.14.0 and earlier I get a different console size - > Apr 21 20:42:44 bluesbreaker kernel: [ 1.445992] Console: > switching to colour frame buffer device 133x54 > > My console font is 12x22, and my screen is 1600x1200 but it looks > as if 3.15-rc2 has fallen back to trying to use 1024x768. > > I'm attaching what look like the relevant parts of the messages > from the system logs for 3.15-rc2 and 3.14.0. > > Any ideas, please ? This is an AMD A4-5300 APU and not the world's > fastest machine for bisecting :-( I'd guess it's either the pll rework patches or the switch to the common dp helper code patches. It would be helpful if you could bisect. Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/