how do I get 1280x1024 resolution from ati/radeon?

Asked by Dan Connolly

I have an ATI Radeon 7000 AGP Video Card and an NEC MultiSync LCD1700M+ monitor. My debian box (with some other video card) drives the monitor at 1280x1024 pixels. I'm pretty sure this video card is capable of that resolution, but I can't get Ubuntu (breezy) to do it.

Should I manually edit Section "Screen" of /etc/X11/xorg.conf ? That seems horribly un-ubuntu.

This line from /var/log/Xorg.0.log seems to say it has 32MB of RAM; isn't that enough?

(--) RADEON(0): VideoRAM: 32768 kByte (32 bit DDR SDRAM)

Another line shows that the monitor claims (via EDID) to support higher resolutions:

(II) RADEON(0): 1280x1024@75Hz

I wonder what this means:
(II) RADEON(0): Not using default mode "1280x960" (hsync out of range)

Some other relevant-looking stuff:

(--) PCI:*(1:0:0) ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE] rev 0,
Mem @ 0xd8000000/27, 0xe1000000/16, I/O @ 0xc000/8

0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]

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Solved by:
Manu Cornet
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Christophe JAC (cjac) said :

Try this command in terminal :

sudo dpkg-reconfigure xserver-xorg

Good luck

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Dan Connolly (connolly) said :

yes, that worked! Thanks!

In addition to the resolutions that were selected by default, I selected 1280x1024 during dpkg-reconfigure.

Now why wasn't 1280x1024 selected automatically, based on the EDID info? That seems like a bug, to me; should I file a bug report?

I accepted the defaults on all the other questions; several of them said "this is for advanced users". I thought debconf hid questions like that automatically. No?

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Manu Cornet (lmanul) said :

Marking this request as "answered" since the problem was solved. Feel free to open another one if needed.

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Dan Connolly (connolly) said :