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dhave
Apprentice
Joined: 28 Oct 2005
Posts: 298
Location: Still outside the Matrix ...
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 Posted: Wed Mar 07, 2007 5:26 am Post subject: Why 50Hz not 60Hz for LCD refresh on Thinkpad T43? [SOLVED] |
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I have a Thinkpad T43 with ATI X300 64Mb graphics. On Windows, the default resolution is 1400x1050@60Hz. For some reason, under Linux, the default resolution is 1400x1050@50Hz.
Here's the output of "xrandr -q":
| Code: | 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've tried all kinds of ways to override that 50Hz refresh rate in xorg.conf: Ignoring EDID, inserting a custom vrefresh rate, even using the gtf utility to calculate a modeline for 1400x1050@60. Nothing seems to change anything.
As a quick check, when I run "xrandr -r 60", I get "Rate 60 not available for this size."
When I run "xrandr -r 50", the system accepts it.
I not terribly bothered by the 50Hz, except that I notice a slight flutter when XFCE comes up. Also, I'd just like the system to run at what I presume to be optimal specs.
Can anyone advise me? Thanks.
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Last edited by dhave on Wed Mar 07, 2007 5:26 pm; edited 2 times in total |
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sugar
Guru
Joined: 07 Aug 2004
Posts: 579
Location: Morrinsville, New Zealand
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| Posted: Wed Mar 07, 2007 5:27 am Post subject: |
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| Quote: | | Much of the discussion of refresh rate does not apply to LCD monitors. This is because while a phosphor on a CRT will begin to dim as soon as the electron beam passes it, LCD cells open to pass a continuous stream of light, and do not dim until instructed to produce a darker color. |
wikipedia article on refresh rate
afaia, it doesn't make any difference.
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dhave
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Joined: 28 Oct 2005
Posts: 298
Location: Still outside the Matrix ...
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| Posted: Wed Mar 07, 2007 5:34 am Post subject: |
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| sugar wrote: | | Quote: | | Much of the discussion of refresh rate does not apply to LCD monitors. This is because while a phosphor on a CRT will begin to dim as soon as the electron beam passes it, LCD cells open to pass a continuous stream of light, and do not dim until instructed to produce a darker color. |
wikipedia article on refresh rate
afaia, it doesn't make any difference. |
O.K, thanks, I guess I can live with that. I still don't see why Windows reports one refresh rate and Linux another, and why I can't change the rate at all, at least on my notebook's LCD.
Maybe I should worry about global warming instead.
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