Re: console: aty128fb on G4
Il giorno Tue, 11 Mar 2003, Nicolas Bertolissio così ha scritto:
|From: Nicolas Bertolissio <nico.bertol@free.fr>
|To: debian-powerpc@lists.debian.org
|Date: Tue, 11 Mar 2003 09:39:46 +0100
|Subject: Re: console: aty128fb on G4
[...]
|> Have you tried different resolutions?
|I tried with following kernel parameters:
|aty128fb
|aty128fb:640x480-154
|aty128fb:800x600-124
|aty128fb:832x624-120
|aty128fb:1024x768-99
|aty128fb:1056x792-96
|aty128fb:1280x1024-75
|aty128fb:1600x1200-64
Of course, you put "video=" before those lines.
|with and without frequency (theses are taken from macosx monitor
|configuration panel)
On a 2.4.18 kernel sources I find in the
/usr/src/linux/Documentation/fb/aty128fb.txt file:
Accepted options:
noaccel - do not use acceleration engine. It is default.
accel - use acceleration engine. Not finished.
vmode:x - chooses PowerMacintosh video mode <x>. Depreciated.
cmode:x - chooses PowerMacintosh colour mode <x>. Depreciated.
<XxX@X> - selects startup videomode. See modedb.txt for detailed
explanation. Default is 640x480x8bpp.
I did notice some options do not actually work as described in that file,
but I did not test them on PowerMacs. The file is also inconsistent: it gives
two different syntaxes for the video mode selection: "XxX@X" and "XxXxX".
However, you could try them. Also:
vmode:x - chooses PowerMacintosh video mode <x>. Depreciated.
cmode:x - chooses PowerMacintosh colour mode <x>. Depreciated.
Even if they are "depreciated", you could try them, at worst nothing will
change, I think (hope).
|but there are strange things, for example with 1280x1024-75, messages
|log gives:
|Console: switching to colour frame buffer device 80x30
|
|should be 160x64?
That could mean the driver finds the requested mode to be incompatible with
the system's capabilities (monitor frequencies too high, for instance), and
defaults to a lower resolution mode. On PCs, however, I had a similar
behaviour with settings that where supported by the hardware I was using.
fbset could switch to the requested mode all right.
Sandro
--
Bellum se ipsum alet
La guerra nutre se stessa
Livio, Ab urbe condita, XXXIV,9
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