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Can't get T43 LCD to display at 60Hz in Linux. [SOLVED]
Posted: Tue Mar 06, 2007 11:44 pm
by dhave
I've got a T43 with ATI X300 64Mb graphics. When I run Windows, the default resolution is 1400x1050@60Hz. When I run Linux (Gentoo), the reported resolution is 1400x1050@50Hz.
I'm pretty accustomed to fiddling with my xorg.conf file for monitor and other adjustments, but nothing I do seems to override what I take to be a private conversation between the display device and the LCD screen. The "IgnoreEDID" setting doesn't do anything, nor do my attempts to set a custom vertical refresh rate.
Any help would be appreciated.
Posted: Wed Mar 07, 2007 12:26 am
by dhave
FWIW, here's the output of "xrandr -q" on my system:
Code: Select all
SZ: Pixels Physical Refresh
*0 1400 x 1050 ( 404mm x 303mm ) *50
1 1280 x 1024 ( 404mm x 303mm ) 50
2 1152 x 864 ( 404mm x 303mm ) 50
3 1024 x 768 ( 404mm x 303mm ) 50
4 800 x 600 ( 404mm x 303mm ) 50
5 640 x 480 ( 404mm x 303mm ) 50
6 640 x 400 ( 404mm x 303mm ) 50
7 640 x 350 ( 404mm x 303mm ) 50
8 512 x 384 ( 404mm x 303mm ) 50
9 400 x 300 ( 404mm x 303mm ) 50
10 320 x 240 ( 404mm x 303mm ) 50
11 320 x 200 ( 404mm x 303mm ) 50
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none
I'm wondering why the default refresh rate isn't 60.
Also, when I do "xrandr -r 60" I get this: "Rate 60 is not available for this size."
When I do "xrandr -r 50", the system accepts it.
Posted: Wed Mar 07, 2007 9:27 am
by richp
While other than selling and using them, LCD's, I was unaware that referesh rates were anything more than a hold over from CRT's. Those I could see. Do refresh rates actually do anything with an LCD ?
Posted: Wed Mar 07, 2007 10:06 am
by Leikeze Ajnin
The refresh rate mostly applies to CRT monitors; specifically the functioning of the electron beam used to colorize the screen. Check out
http://en.wikipedia.org/wiki/Refresh_rate for some more of the details.
Posted: Wed Mar 07, 2007 11:54 am
by dhave
I'm learning something here. I'll quick being anxious about my LCD screen's refresh rate and find something else to worry about.
Thanks.