Re: [Unichrome-devel] r24 and CVS-HEAD on K8M800
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Re: [Unichrome-devel] r24 and CVS-HEAD on K8M800
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From: Christoph L. <ch...@ma...> - 2004-08-30 10:10:10
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On Mon, 30 Aug 2004, Christoph Lampert wrote:
> On Mon, 30 Aug 2004, Luc Verhaegen wrote:
> > This code also has 3 options for the K8M800. DotClockSR44, DotClockSR45,
> > DotClockSR46. These take integers, and if they all are between 0 and 255,
> > this value will be written to the 3 primary dotclock registers. If this is
> > not the case, a value from the table will be chosen.
Hi, I tried a few values, and didn't see an improvement, so I started a
"systematic" approach: As a start, I fixed SR44 and SR45 to reasonable
values, and tried the influence of SR46:
SR44="130"
SR45="136" (those are from some 1024x768 mode, which I would have
"liked" on the screen):
Typically, I got 3 different frequency pairs as output, one for
the "1600x1200" entry in XF86Config, one for "1280x1024" and one for
everything smaller (starting at "1152x864") f_H and f_V are again
frequencies as reported by OSD.
"-" means that the LCD reported "no signal". I started from SR=0 to SR=16,
then got bored and only tested the new bit positions 32,64,128 and their
direct neighbours to see a trend. At first sight, there clear is a
multiplicative connection for values "0" to "33" (I would assume until
"63"), with (SR46+2)*frequency = const.
If bit 6 ("64") is set, bits 0-5 are ignored. Bit 7 has no influence for
the "0" to "63" modes, but enabling 6+7 ("192") at the same time is
different from 6 alone, though still 0-5 are ignored.
Is this how it's supposed to work?
chl
SR46 f_H f_V
"1600x1400" "1280x1024" "smaller"
"0" 82.9 56.3 295.4 200.2 - -
"1" 55.3 37.5 196.8 133.6 - -
"2" 41.4 28.1 147.6 100.2 147.6 328.9
"3" - - 118.1 80.1 118.1 262.9
"4" - - 98.4 66.8 98.4 219.2
"5" - - 84.3 57.2 84.3 187.9
"6" - - 73.8 50.1 73.8 164.4
"7" - - 65.6 44.5 65.6 146.1
"8" - - 59.0 40.0 59.0 131.5
"9" - - 53.6 36.4 53.6 119.5
"10" - - 49.2 33.4 49.2 109.6
"11" - - 45.2 30.8 45.2 101.1
"12" - - 42.1 28.6 42.1 93.9
"13" - - 39.3 26.7 39.3 87.6
"14" - - 36.9 25.0 36.9 82.2
"15" - - 34.7 23.5 34.7 77.3
"16" - - - - 32.8 73.0
"32" - - - - 17.3 38.6
"33" - - - - 16.8 37.6
"64" 90.4 61.4 322.0 218.2 - -
"65" 90.4 61.4 322.0 218.9 - -
"66" 90.4 61.4 322.2 218.9 - -
"127" 90.4 61.4 322.2 218.9 - -
"128" 82.9 56.3 295.2 200.2 - -
"129" 55.2 37.2 196.8 133.6 - -
"130" 41.4 28.1 147.6 100.2 147.6 328.9
"143" - - 34.7 23.5 34.7 77.4
"192" 98.8 67.0 352.0 239.0 - -
"193" 98.8 67.0 352.3 239.0 - -
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