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My screen resolution is 1600x900p normally. Without specific graphic drivers it 900p in GRUB and ttys, too. If i install fglrx as driver it is set to 640x480p when i start a tty, and the widescreen causes big "pulled" letters on my screen. Does Anyone know how to fix that?

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This is because fglrx (the proprietary AMD Radeon device driver) does not support Kernel-Mode Setting (KMS).

In the GRUB (boot loader) configuration file located in /etc/default/grub there is a setting called GRUB_GFXMODE you can set it to GRUB_GFXMODE=1200x900. Then you need to run sudo update-grub2.

Run vbeinfo in GRUB to see which graphics modes your graphics card supports.

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