Problem with ati driver at 2560x1600

Alex Deucher alexdeucher at
Sun May 3 15:46:49 PDT 2009

On Sun, May 3, 2009 at 6:09 PM, Wil Reichert <wil.reichert at> wrote:
> On Sun, May 3, 2009 at 2:04 PM, Alex Deucher <alexdeucher at> wrote:
>> On Sun, May 3, 2009 at 12:20 PM, Wil Reichert <wil.reichert at> wrote:
>>> Seems I'm getting some wierd issue where both text and graphics (i.e.
>>> fonts, window decorations, etc) are pixelated & blocky at 2560x1600.
>>> Drpoping the resolution to 1920x1200 makes everything fine.  I've
>>> tried both 6.12.2 and git master of xf86-video-ati, both have the same
>>> issue.    Tried various windows managers, all have the same problem.
>>> I got a screenshot via gimp to show the problem, but it looked fine.
>>> Attached is my x log.
>> Are you sure your card supports dual link dvi?  Not all r5xx cards are
>> wired up for dual-link dvi support.  1920x1200 is still within the
>> bounds of single link dvi while 2560x1600 requires dual-link.
> Ah, I assumed just because it was mentioned on the ATI spec sheet it
> would work.  Silly me.  Just confirmed Windows maxes out at 1920 x
> 1200 as well.  Is lack of a dual link connector something that could
> potentially be detected by the driver?

On newer cards (r6xx+), single link vs. dual link is specified in the
object table in the video bios.  I'm not sure how it's done on older
cards off hand.


More information about the xorg mailing list