On Sun, Feb 06, 2011 at 03:07:59AM +0200, Nikos Chantziaras wrote

  From "lspci -v"...

01:05.0 VGA compatible controller: ATI Technologies Inc Device 9712
(prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device 0372
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at c0000000 (32-bit, prefetchable) [size=256M]
        I/O ports at 9000 [size=256]
        Memory at d0100000 (32-bit, non-prefetchable) [size=64K]
        Memory at d0000000 (32-bit, non-prefetchable) [size=1M]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [50] Power Management version 3
        Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
        Kernel driver in use: radeon

01:05.1 Audio device: ATI Technologies Inc Device 970f
        Subsystem: Acer Incorporated [ALI] Device 0372
        Flags: bus master, fast devsel, latency 0, IRQ 19
        Memory at d0110000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 3
        Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
        Kernel driver in use: HDA Inte

  Are you sure you're requesting a supported mode?  Execute...

grep Modeline /var/log/Xorg.0.log

...and see if the mode you want is in the list.

-- 
Walter Dnes <waltd...@waltdnes.org>

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