MergedFB and multiple external monitors

Martin Langhoff martin.langhoff at
Wed Jan 3 10:10:58 PST 2007

On 1/4/07, Alex Deucher <alexdeucher at> wrote:
> Take a look at the radeon man page.

I have ;-)

>  You can force mergedfb on and
> define hsync and vrefresh ranges for crtc2, then just define metamodes
> with the configurations you want.

Yup, I am doing exacly that. However, if starts and doesn't find
an external monitor attached, it ignores my "extended" metamodes. Even
though I've successfully hardcoded some modelines in there that
override the DDC data.

Relevant log bits:
(II) RADEON(0): Modes for CRT2: ********************
(--) RADEON(0): Virtual size is 640x480 (pitch 640)
(**) RADEON(0): *Mode "1280x854"
(**) RADEON(0):  Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(II) RADEON(0): Modeline "640x480"   25.20  640 656 752 800  480 490
492 525 -hsync -vsync
(II) RADEON(0): Generating MergedFB mode list
(WW) RADEON(0): Mode "1440x900" is not a supported mode for CRT2
(WW) RADEON(0):         (Skipping metamode "1280x854-1440x900")
(II) RADEON(0): Merged "1280x854" (1280x854) and "1280x854" (0x0) to
1280x854 (Clone)



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