[Bug 75649] Glitchy output using only HDMI on laptop with AMD Mobility Radeon HD 3450/3470

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75649

--- Comment #6 from Paul Bodenbenner <paul.bodenbenner at gmail.com> ---
I get the same problems as described before with two different monitors. Using
an up-to-date Arch Linux with kernel 3.14 (also tried kernel 3.15rc2) with a
hd3470 card. Problem occurs only, if an external monitor is connected at
resolution 1920x1080 at 60Hz in single mode (extended mode makes no problems).
Funny enough when using 1920x1080 at 50Hz in single mode everything seems also
fine. By switching back to Catalyst the problem doesn't occur.

Found some similar threads:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1209315
https://bugs.freedesktop.org/show_bug.cgi?id=42621

By disabling color tiling and dpm the phenomenon appears only when switching
between modes (monitors on / off). So in this case when starting the laptop
with closed lid everything is ok, until switching between modes.

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