Radeon-Drivers: Blank Laptop Screen / HDMI out to TV working

English Hardware
1

Hello,

i really have a strange problem…
I am using the open-source radeon-drivers and OpenSuse 12.1

Graphic card is Ati Mobility Radeon HD 5470. I connected my TV to HDMI. I got the TV working but the laptop screen stays blank. OpenSUSE recognizes the Laptop screen, i can even switch resolution, but the screen stays black. I tried to manually generate a resolution-mode for my laptop screen using gtf - but still no success.

When i reboot and the TV goes off, i can see the Suse-Background on my Laptop-screen for some seconds.

Anyone already got that problem and fixed it?
Thanks in advance!

2

I’d speculate that the open source driver is probably syncing to a res/frequency incompatible with your LCD OR it won’t support dual head with your specific configuration.

You could try the proprietary driver, possibly from the ati repo.

I suppose when you start the system without the TV connected the LCD starts OK, and then you could check the res/freq used and compare with the TV’s.

3

the problem is that i can´t use the proprietary driver because the graphic card is an hybrid mux-card (intel and ati chip) and that is not supported by ati and my bios won´t let me disable the intel-graphiccard…

i tried the res/freq-combination that is supported for my lcd-screen but it is not working…

4

I’m not sure where the support is at for AMD hybrid graphics yet, but I note that AMD appear to be working on it. Back in April, this was reported

[Phoronix] AMD Puts Out Catalyst 11.4 With X Server 1.10 Support](http://www.phoronix.com/scan.php?page=news_item&px=OTM4Ng)

I note that the Catalyst 11.11 display driver is now out

ATI Catalyst™ Proprietary Display Driver

and this should have some support for switcheable graphics (via amdcccle) but unfortunately, I can’t verify this.

FWIW, here is a similar thread on this topic where one user claims to have switcheable graphics working (ref post #5)

Is there a linux driver supporting AMD Radeon HD 6490M in switchable graphics mode?

5

Have you tried using xrandr at all ? I note this archlinux wiki article: https://wiki.archlinux.org/index.php/ATI#HDMI_Audio