[Bug 38170] LG TV shows no signal attached to radeon via HDMI (and is improperly detected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38170

--- Comment #12 from Thomas Martitz <kugel at rockbox.org> 2011-06-13 08:16:11 PDT ---
(In reply to comment #11)
> Does your bios setup have an option to enable the discrete card by default?

Yes and no, it has "Switchable" (with the Intel being default) and "Discrete"
(only) as options. For the reference, my laptop is a Acer Aspire Timeline
3810TG.

With Discrete selected in the bios, HDMI also output doesn't work (haven't
tried radeon.audio=0 but I assume it would work then).

But I notice two difference compared to switchable. First, the HDMI audio
device is not listed in the neither gnome-volume-control pavucontrol anymore,
even though lsusb and alsamixer do list it. Second, the screen goes off when
plugging the HDMI cable in or out or when switching sources to/from HDMI
from/to TV on the TV (only switching to a VT and back to X seems to recover
this).

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