Bug#484015: xserver-xorg-video-ati: [r128][powerpc] output is limited to 800x600 even with 1024x768 display

[Alex Deucher]

On Mon, Jun 2, 2008 at 9:24 AM, Rogério Brito <rbrito at ime.usp.br> wrote:
> Hi, Michel. Long time no see/talk. :-)
>
> On Jun 02 2008, Michel Dänzer wrote:
>> On Sun, 2008-06-01 at 18:29 -0300, Rogerio Brito wrote:
>> > Oh, BTW, one error/warning that I see reported on the machine's
>> > console (and that apparently doesn't get included in the X logs) is
>> > the following:
>> >
>> > (many times the following error---at least 20 times in a row)
>> > (EE) R128(0): FBIOPUT_VSCREENINFO: Invalid argument
>> > (...)
>>
>> But they are included in the log file:
>>
>> > (II) R128(0): Not using default mode "1024x768" (unknown reason)
>> > (EE) R128(0): FBIOPUT_VSCREENINFO: Invalid argument
> (...)
>
> Sorry. Missed them while perusing the file.
>
>> So, for some reason the kernel's aty128fb is rejecting the X server's
>> 1024x768 modes.
>
> Indeed. That's one of the reasons why I tried downloading an older 2.6
> kernel, but the dependencies of modern udev have stopped me from
> compiling it (I would try with the kernel released with sarge, i.e.,
> 2.6.8).
>
>> Have you tried putting an X mode definition (e.g.  obtained by fbset
>> -x) of the console 1024x768 mode into the xorg.conf monitor section?
>
> Yes, I did that when I first reported this bug to Ubuntu, but apparently
> the bug went unnoticed for a long time and sorted as "unimportant" (!)
> or something like that.
>
> Anyway, I just tried it again and I'm including here attached both the
> xorg.conf and the X log.

FWIW, you might also try commenting out the "Usefbdev" option.  IIRC,
the driver does work without it.

Alex