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Re: MGA400



On 2001-08-21, Owen Taylor wrote:

>> $ rpm -q XFree86-SVGA XFree86
>> XFree86-SVGA-3.3.6-38
>> XFree86-4.0.3-5
>>
>> While my Matrox Millennium G400 (16 MB) with XFree86 3.3.6 runs fine
>> at 32 bpp, the 4.0.5 version logs this error:
>
>4.1.0? AFAIK, there never was a 4.0.5.

Sorry, a typo. See top: 4.0.3-5

>>   (EE) MGA(0): Given depth (32) is not supported by this driver
>>
>> It runs at 24 bpp, but some applications (like kwintv or zapping)
>> don't like this and draw over the whole screen horizontally,
>> probably assuming 32 bit pixel width.
>>
>> Can I do anything to fix this?
>
>Man XFree86 .... look at the -depth and -fbbpp options. You seem to
>want -depth 24 (24 bits used for colors) and -fbbpp 32 (32 bits per
>pixel).

With 3.3.6 I use this line in /etc/X11/xdm/Xservers:

:0 local /usr/X11R6/bin/X -bpp 32

With 4.0.3-5, the driver doesn't support 32 bpp. Hence I've have
taken it out and have the following in XF86Config-4:

Section "Screen"
    Identifier "Screen0"
    Device "Matrox Millennium G400"
    Monitor "S/M 950p+"
    DefaultDepth 24
    Subsection "Display"
        Depth 24
        Modes "1024x768" "800x600"
#        Modes "1280x1024" "1152x864"
    EndSubSection
EndSection

Apparently, this enables the 24 bpp mode by default, which breaks
kwintv on Seawolf.

>(Usually, though, it's best to just trust the Xserver on what fbbpp it
>picks for a given depth, and complain to the authors of broken
>apps...)

Aha, so kwintv is broken with 24 bpp true colour?

Why doesn't the driver support 32 bpp anylonger? Just found this
in the log:

(==) MGA(0): Default visual is TrueColor
(II) MGA(0): [drm] bpp: 24 depth: 24
(II) MGA(0): [drm] Direct rendering only supported in 16 and 32 bpp modes
(II) MGA(0): Using 4693 lines for offscreen memory.
(**) MGA(0): DPMS enabled
(II) MGA(0): Using overlay video
(II) MGA(0): direct rendering disabled






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