Problem with ati driver at 2560x1600

[Alex Deucher]

On Sun, May 3, 2009 at 6:09 PM, Wil Reichert <wil.reichert at gmail.com> wrote:
> On Sun, May 3, 2009 at 2:04 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
>> On Sun, May 3, 2009 at 12:20 PM, Wil Reichert <wil.reichert at gmail.com> 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.

Alex