From: Hihn, Jason <Jason.H<ihn@ve...> - 2004-04-06 17:23:21
There is a i2c interface between the card and the monitor that tells it
what the monitor's capabilities are. If your monitor can't do it, it
won't let you, because you can damage hardware that way.
15bit I think dates back to some [matrox?] cards, circa 1995. No one
else really had/supported that.=20
From: Jean Delvare [mailto:khali@...]=20
Sent: Tuesday, April 06, 2004 12:13 PM
Subject: Re: [Linux-fbdev-users] radeonfb: strange blue lines after
> This is a step in the right direction:
> 1600x1200-8@...: ok
> 1600x1200-16@...: blue screen
> 1600x1200-24@...: 'no mode found' in dmesg?
> 1600x1200-32@...: blue screen
Just tried, same here (Radeon 9200 Ya). If I ask for 15-bit I get 16, if
I ask for 24 I get 8. 8 is OK WRT blue background, 16 and 32 are not.
BTW, how do you get 75Hz vertical refresh? I just can't. Whatever I ask
through lilo, I end up with 60Hz (both fbset and the screen's OSD
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From: Jean Delvare <khali@li...> - 2004-04-06 19:00:32
> There is a i2c interface between the card and the monitor that tells
> it what the monitor's capabilities are. If your monitor can't do it,
> it won't let you, because you can damage hardware that way.
It's a Hyundai Q17, capable of 1280x1024@... But the docs say that 60Hz
is recommended so maybe that's what it says to the Radeon board over the
After all, it's a TFT display, maybe it doesn't really care about the
On Tue, 6 Apr 2004, Hihn, Jason wrote:
> 15bit I think dates back to some [matrox?] cards, circa 1995. No one
> else really had/supported that.
Many cards do both 15 (5/5/5) and 16 (5/6/5), e.g. ATI Mach64. The main
disadvantage of 5/6/5 is that you cannot have accurate greyscales. Grey will
always be a bit greenish or purplish, since there are no integer values x and y
for which x/31 = y/63.
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds