[ltp] ATI Driver 8.10.19 not working on DVI

[Alex Deucher]

On Mon, 28 Feb 2005 16:27:16 -0500, Paul R Streitman <prs@us.ibm.com> wrote:
> I get one or the other.  I did not try for dual head or simultaneous
> display and do not know whether they are possible with ATI's driver and
> DVI.  I have never been able to switch between external and internal
> displays (without restarting X) with a Radeon chipset thinkpad.
> Personally, I do not see it as valuable anyway as most external monitors
> will not do 1400x1050 and I certainly would not want to run my thinkpad at
> a lower distorted res.
> 
> Perhaps Alex will comment, but I have observed with both ATI's driver and
> the xorg Radeon driver that attempting to run the thinkpad LCD in other
> than native resolution results in a strange display with the image in the
> upper left and 'bars' of color to the right and below it.  Also, neither
> driver correctly detects what my external display is capable of providing
> and I have to coerce it to the correct 1280x1024.  That is why I have two
> layouts in the profile.
> 
>                                                               Thanks,
>                                                                 Paul

I'm not sure how ati's driver deals with outputs, but I suspect it may
make the same hardcoded assumptions that the xorg driver does about
crtc to output mappings.  I've been working on a patch to address
this, but I don't have the hardware to test and I haven't had time to
mess with it lately.
the link is here for those that are interested:
https://bugs.freedesktop.org/show_bug.cgi?id=2273
part of the problem is that both the LCD and the FP need fp_gen_cntl
initialized, but I haven't quite worked out the best way to handle
that.

Alex