dual head using HDMI output on ati radeon 5470

[Albert Wagner]

On 01/27/2011 06:53 PM, MR ZenWiz wrote:
> On Thu, Jan 27, 2011 at 4:39 PM, Albert Wagner<albertwagner at cox.net>  wrote:
>> I have Ubuntu 10.10 running on an HP G72 laptop with vga and HDMI  outputs
>> from an ATI Radeon 5470.  Dual heads is simple with vga: just use
>> System->Preferences->Monitors.  But, getting anything at all from the HDMI
>> output is proving to be very difficult.
>>
>> My digital monitor is an HP 2310e that looks outstanding when driven by a
>> dvi input on another machine.  But it has only digital inputs, no vga.
>>
>> I would really appreciate feedback from anyone using the Ubuntu Radeon
>> driver(KMS on is default) as to whether, and how, it can be coerced to
>> detect the HP 2310e and output through the Radeon 5470 HDMI plug.
>>
> Normally, if your monitor doesn't have an HDMI output you can get a
> converter plug for your dvi cable.
The monitor has all three digital inputs: HDMI, DVI, and DisplayPort.
I is set to accept input from the HDMI.

> You also (usually) need to fiddle with one of the keyboard function
> keys that allows you to switch between internal, external and both
> monitors (this is often<func><F5>, but ecah laptop is different).
>
> After that, you should be able to use both.
I think that it must be F4 on this HP, because there is a little monitor 
icon there.  I haven't yet hit the correct pattern of multi-keys and timing.