Bug 77671

Summary:	radeon system does not boot with 3.14.6 (bisect -> 4740d5c1c89c152ef847e4a479a87a25e763b286)
Product:	Drivers	Reporter:	René Rietz (renerietz)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED CODE_FIX
Severity:	high	CC:	alexdeucher
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	3.14.6	Subsystem:
Regression:	No	Bisected commit-id:

Description René Rietz 2014-06-11 17:23:06 UTC

My system does not boot anymore (blank screen, no response, no journal entries after restart) with kernel 3.14.6. I did a bisect on the linux-stable tree (3.14.y branch). The last non-working commit was:

commit 4740d5c1c89c152ef847e4a479a87a25e763b286
Author: Alex Deucher <alexdeucher@gmail.com>
Date:   Fri Apr 11 11:21:50 2014 -0400

    drm/radeon: add support for newer mc ucode on CI (v2)
    
    commit 277babc374f6ecab6af182554f5d9f35a7768755 upstream.
    
    Fixes mclk stability on certain asics.
    
    v2: print out mc firmware version used and size
    
    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=75992
    
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


Chipset info from Xorg: RADEON(0): Chipset: "VERDE" (ChipID = 0x683d)

Comment 1 Alex Deucher 2014-06-11 17:31:53 UTC

This commit requires new microcode in the driver.  You are probably seeing the firmware loader waiting for a long time for the new microcode to become available.  Grab the latest radeon microcode from the linux-firmware tree.

Comment 2 René Rietz 2014-06-11 19:48:27 UTC

Thanks for the hint! The new kernel firmware fixes the problem.