linux-kernel - 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

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Date:	Mon, 21 Apr 2014 21:32:08 +0100
From:	Ken Moffat <zarniwhoop@...world.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Deucher <alexdeucher@...il.com>
Subject: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

 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:

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 :-(

ĸen
-- 
das eine Mal als Tragödie, dieses Mal als Farce

View attachment "drm-aruba-3.15-rc2" of type "text/plain" (7066 bytes)

View attachment "drm-aruba-3.14" of type "text/plain" (6835 bytes)