https://bugzilla.novell.com/show_bug.cgi?id=363599
User lverhaegen@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=363599#c8
--- Comment #8 from Luc Verhaegen 2008-02-21 06:56:49 MST ---
This looks like it could be one of three things...
1) It could be a dotclock issue. The dotclock might be unstable. This means
that the pixels are being sent out at a rate which is not exactly constant, and
the monitor has problems keeping up yith this.
A different configuration of the dotclock might result in a constant mode.
Try the following modelines:
Modeline "1680x1050" 146.50 1680 1784 1960 2240 1050 1053 1059 1089 +hsync
-vsync
Modeline "1680x1050" 146.00 1680 1784 1960 2240 1050 1053 1059 1089 +hsync
-vsync
This should get a different parameter set for the pll, and will hopefully give
you a working mode.
If this fixes it, then it is clearly a dotclock issue.
2) It could be that the dotclock (pixelclock) is too high for the panel. The
modeline suggests that it is a mode with normal blanking:
(II) SIS(0): Modeline "1680x1050" 146.25 1680 1784 1960 2240 1050 1053 1059
1089 +hsync -vsync
If you try reduced blanking (cvt -r), you get:
# 1680x1050 59.88 Hz (CVT 1.76MA-R) hsync: 64.67 kHz; pclk: 119.00 MHz
Modeline "1680x1050R" 119.00 1680 1728 1760 1840 1050 1053 1059 1080 +hsync
-vsync
If this fix succeeds, then this doesn't mean that the issue is fully
identified.
Get a 1600x1200@60Hz capable CRT out, and force the original mode on it. If it
still persists on the CRT, then it is the next issue.
3) this could be a FIFO/Buffering issue. And the buffer seems to be having
trouble at the 48pixel mark (width / number of bands).
I am worried about whether this testing can actually be done. I see some VBE
calls in your log, and i hope that this is not used for modesetting directly.
Because if it is used for modesetting, then the above tests will be hard to
execute.
So with each step, verify from the log that you are actually setting the
desired mode.
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