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I use a laptop having two graphic cards as a home cinema computer. It works using the VGA output, however it doesn't using the HDMI output. I want to use the HDMI since the VGA input of my TV seems limited to the 1280x1024 resolution.
In the display configuration, when the HDMI connection is used, the TV screen isn't detected.
Using lspci I can see that Linux recognizes my two graphic cards (embedded radeon HD3200 and the radeon HD3650). It seems that the Radeon open source driver is used since I can see it in lsmod. However I don't know which of my two graphic cards is used by the radeon driver.
I suppose that it's the embedded one since the HDMI output doesn't work, and that maybe switching to the HD3650 will make things better.
Thus the question is how can I force Linux tu use the HD3650? Note that I can't disable the embedded graphic card in the BIOS.
I switched to console with ctrl+MAJ+F2. Then I wrote init 3 to shutdown X and I log as root. I wrote the three commands and after the third one the screen becomes black. Thus I'm forced to reset the IGD graphic card (in fact I missed your last sentence and I just rebooted the computer).
Maybe there is a way to totally disable the embedded graphic card? I don't need it since the laptop is always plugged to sector.
It looks like your embedded card is hooked to your display and vga out and your discrete card is hooked to your display, vga out, and HDMI. Try using the following as a boot parameter and see if the discrete card will get used instead of the embedded card.
If so, then you might be able to select the hdmi output
Another option is to install the catalyst fglrx driver and use it in place of the radeon driver. The catalyst fglrx driver makes it easier to switch between the two cards. The downside is kernel updates can be problematic.
Last edited by colorpurple21859; 07-14-2013 at 08:46 PM.