[Bug 19236] New: Radeon r300 overlay resolution and pixel clock

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19236

           Summary: Radeon r300 overlay resolution and pixel clock
           Product: xorg
           Version: git
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: ranma+freedesktop at tdiedrich.de
         QAContact: xorg-team at lists.x.org


For pixel clocks above 175MHz the backend scaler overlay resolution is halved.
I suspect maybe a hardware limitation of older chips only.
On my r300, after patching radeon_video.c so that ecp_div is always 0, the
overlay looks much better now (Using a custom 1680x1050 at 72 modeline, which
unfortunately has a pixel clock above 175MHz).
Now I'm not sure if this means I'm overclocking the backend scaler.
But the scaler seems to work just fine at this setting, so maybe this is only
required for older chips?

My custom modeline:
Modeline "1680x1050 at 72" 198.36 1680 1712 2464 2496 1050 1070 1082 1103

Default monitor modeline:
(II) RADEON(0): Modeline "1680x1050"x0.0  146.25  1680 1784 1960 2240  1050
1053 1059 1089 -hsync +vsync (65.3 kHz)

The custom modeline was generated with xtiming.sf.net, I wanted a 72Hz modeline
because I usually watch 24Hz videos and expect that a refresh rate of 72Hz is a
better match than 60Hz for this.


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