[Bug 22853] ati driver doesn't honnor aymore resolution specified in xorg.conf on CRT monitors

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=22853


Alex Deucher <agd5f at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/Radeon               |Server/general




--- Comment #6 from Alex Deucher <agd5f at yahoo.com>  2009-07-21 07:01:52 PST ---
(In reply to comment #5)
> Well:
> - according to its specs, Acer 77e can do 1280x1024 at 67Hz
> - 1280x1024 did was supported with the SiS driver with this Acer
> 

The monitor's edid does not contain an modeline for 1280x1024 at 67hz, as such
you'd need to add a modeline to use it.  The edid does contain a a
1280x1024 at 75hz mode, however it conflicts with the max pixclock specified in
the same edid.  So either the max pixclock is wrong or the the 1280x1024 at 75hz
mode shouldn't be there.  If the 1280x1024 at 75hz mode does work, then an edid
quirk needs to be added to the xserver.

> AFAIC, there's two bugs in ati driver:
> - when a mode is not supported, it should be written down in
>   the logs, thus it's easier to understand the issues

This is handled by the common randr code in the xserver, not the driver.  If
you enable more verbose server logging you can see which modes get rejected and
why.

> - we should select alesser refresh frequency when the suggested
>   one is too high.
> 

You'll need to specify an modeline if you want to use a mode that's not in the
monitor's edid.  It's not really feasible to add every possible mode to the
output there are just too many possibilities.  Plus, most monitors (especially
LCDs) are very picky about what mode timings they will accept.


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