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Integrated and PCIe graphics: how to disable integrated graphic card?

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Hello,

I have installed openSuSE 13.1 x86 on Asus mobo H87M-Plus.
Graphics capability:

Integrated:
- VGA compatible controller: Intel Corporation Device 041e (rev 06) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device 8534
PCIe:
- VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450] (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device 047b

I want to use the Radeon PCIe graphics card exclusively (or as first video card). The system will be used as video system with MythTV. Because of serious trouble (booting, Firefox hangs e.g.) I installed Linux Mint 16 (which is running without issues). I prefer to use open source modules!

Until now I have tried these steps:
1) blacklist i915 driver -> no effect, driver will be loaded and the associated integrated graphics will be the first (and only?) video card.
2) booting with -nomodeset -> delay in boot, but i915 will be loaded as primary, radeon module will not be loaded properly
3) modprobe -r i915 in /etc/init.d/boot.local -> no effect
4) installing arandr -> options of radeon graphics not showing up. Same for lxrandr., HDMI options for integrated graphics card grayed ...(not accessible)
5) experimental sax3 in init 3 mode: will crash on option 'Monitor'

Readings (forum, general) until now:
https://forums.opensuse.org/showthre...-openSUSE-11-3
https://forums.opensuse.org/showthre...onitor-Problem
http://en.opensuse.org/SDB:Configuri...config_file.29
http://devgurus.amd.com/message/1302563#1302563

...leading to complex dual-head dual graphic setup or 'bumblebee failure' (mostly nv or nVidea related) or outdated distro how-to's or manual configuration of xorg.conf files.

My strong feeling is, that the configuration of the graphical environment (on Asus H87M-Plus) for inexperienced users using a configuration with integrated and external (PCIe) graphics card is not easy.

How can I disable the integrated graphics / make the PCIe graphics card the primary card?

Thanks for looking at this.
Fiete

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