We have a similar problem: A HD6570(TURKS) card with RS780E chipset. When booting, DVI output is good, but VGA output is black screen; after X started, DVI is still good and VGA blinks forever. We have tried 3.4~3.9-rc7 kernel, all kernels after the commit "drm/radeon: properly handle mc_stop/mc_resume on evergreen+" has the same issue.

On Mon, Nov 12, 2012 at 2:55 AM, <bugzilla-daemon@freedesktop.org> wrote:

Florian Mickler changed bug 56139

What Removed Added

CC florian@mickler.org
Comment # 25 on bug 56139 from Florian Mickler
A patch referencing this bug report has been merged in Linux v3.7-rc5:

commit 695ddeb457584a602f2ba117d08ce37cf6ec1589
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Mon Nov 5 16:34:58 2012 +0000

    drm/radeon: fix typo in evergreen_mc_resume()
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