HDMI functions on Linux

HDMI works fine here.

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a

Thanks

I had the same problem. Plug the HDMI in, Go to System Settings, Displays, click Mirror Displays, and then adjust the resolution until the desktop shows up on the output screen. You have to press apply after every change you make. As for the sound I don't know what to say, mine still doesn't work. But you may have success playing with the different resolution settings available.

actionaparsnip

I ran the instruction in the terminal and here are my results:

 *-display
       description: VGA compatible controller
       product: RS880M [Mobility Radeon HD 4200 Series]
       vendor: Advanced Micro Devices [AMD] nee ATI
       physical id: 5
       bus info: pci@0000:01:05.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:18 memory:e0000000-efffffff ioport:6000(size=256) memory:f2200000-f220ffff memory:f2100000-f21fffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.10
Release: 12.10
Codename: quantal
Linux cybertron-Aspire-5552 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:15:40 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Did you try what I suggested? The answer is not always complicated or technical. For example my HDMI only works at 1280x720 (mirror displays). Any other resolution and the screen is completely blank --nothing shows up. I have ATI radeon HD 7500 graphics, which is similar to yours. As for sound, some people have found this to work:

Open terminal and type:

gksudo gedit /etc/default/grub

Grub config file will pop up, Find the following line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

replace with this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"

Then make sure you save the file and close it.

Back in terminal:

sudo update-grub

And then reboot your computer. (sudo reboot)

When you log back in after rebooting, make sure under system settings, sound, (output tab) that:

Output= Built-in Audio Digital Stereo (HDMI)

Connector= HDMI/Display Port

And under the hardware tab:

Profile=Digital Stereo (HDMI) Output

Output Volume=100%

There is also a "Test Speakers" to see if it is working. But I would log in and out first just to make sure the changes have taken place.

Anyways, hope this helps you.

Thanks

the Xorg in Quantal hates you GPU. You are currently using the opensource driver but if you use this link it may help
https://launchpad.net/~makson96/+archive/fglrx

Yes actionparsnip hit the nail on the head. I have problems with my GPU as well in Quantal. I tried the fglrx from all sorts of different sources including the ppa he gave you. None of them worked. Hopefully you have better success with it than I did. Although the open source driver works pretty well, I am able to use compiz desktop cube and all that jazz. Keep us posted. I am interested to see if you are able to install fglrx.

Well, this is very frustating. I have applied all of the suggestions given and only once did the HDMI work from my desktop but still had no sound even after doing everything as isntructed through the terminal. Now I can leave the HDMI plugged in during the reboot and the reboot screen shots show up and my Ubuntu window asking what Ubuntu service I want. After I select Ubuntu it goes to another screen and I loosed the video connection to the tv. This is where I am at right now. I have rebooted numerous times with the same result. Any suggestions would be appreciated. You have already given me some excellent suggestions.
Thank you.

 Yes unfortunately, I suffer from the same issues. I cannot reboot my computer with HDMI or it goes blank. I cannot unplug my laptop from the power source of the HDMI stops working. If my screensaver goes on my HDMI stops and I have to reboot. I have found that the only thing I can do is this:

1. Plug in my laptop.

2 Plug in HDMI to laptop and output screen.

3. Open system settings, select mirror images, and slect 1280 x 720 (This is when the picture starts working)

4. Do not interrupt the display in any way (wiggle cord, let screensaver turn on, unplug power, restart computer etc.)

And the sound still won't work, just video. So I am in the same boat as you. The only thing you can do is install the fglrx driver, or wait until April when 13.04 is released, which will hopefully resolve these issues.

If you haven't already tried, the way to install the fglrx driver is in the link in post #5, provided by actionparsnip. This may help you resolve your issue. Unfortunately, it did not help me, so I must wait until April to see if 13.04 works. If the fglrx driver and the above do not work for you, I am afraid you are SOL until April, or if you can't wait, you could try the 13.04 beta in March. Sorry if none of this helps, I know how you feel because I'm in the same situation.

Good Luck