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 Forum index » House Training » Beginners Help ( Start Here)
How to change screen refresh rate?
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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Sun 17 Jul 2011, 09:36    Post subject:  How to change screen refresh rate?  

Hello.
I am using puppy525.
I want to change the screen refresh rate to 75Hz.
In menu >> setup >> Xorg Video Wizard >> Resolution Changer >> 1280x1024@60.*+

I have also installed "Xorg High -GLX For Radeon and Intel Cards" form QuickPet Drivers.

But still could not find a way to change the refresh rate.

Any help
Thanks.
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Béèm


Joined: 21 Nov 2006
Posts: 11782
Location: Brussels IBM Thinkpad R40, 256MB, 20GB, WiFi ipw2100. Frugal Lin'N'Win

PostPosted: Sun 17 Jul 2011, 11:08    Post subject:  

Are you sure your video card will support 75Hz?
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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Sun 17 Jul 2011, 17:47    Post subject:  

On window7 my screen resolution is 1280 x 1024 and Screen refresh rate is 75Hertz.
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bigpup


Joined: 11 Oct 2009
Posts: 5482
Location: Charleston S.C. USA

PostPosted: Mon 18 Jul 2011, 01:04    Post subject:  

menu->setup->xorg video wizard->xorgwizard
select probe.
Set resolution.
Select test.
Select test X now.
After test results - select OK.
Select tweak.
Select tweak_xorg.conf
Select tweak_refresh
Scroll up or down ( some selections you will not see without scrolling)
High-lite desired refresh
Select OK
Select test X now.
If you select one that your hardware will not support, it will stall for a few sec. and fall back to last good setting.
Finish xorgwizard

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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Wed 20 Jul 2011, 08:13    Post subject:  

I have tried it. But it did not work

Quote:
Report on X test:
Resolution 1280x1024 pixels
Horizontal frequency: 63.98 KHz
Refresh frequency: 60.02 Hz
Video card: intel


The refresh rate still remains at 60Hz
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bigpup


Joined: 11 Oct 2009
Posts: 5482
Location: Charleston S.C. USA

PostPosted: Wed 20 Jul 2011, 17:03    Post subject:  

s3u wrote:
I have tried it. But it did not work

Quote:
Report on X test:
Resolution 1280x1024 pixels
Horizontal frequency: 63.98 KHz
Refresh frequency: 60.02 Hz
Video card: intel


The refresh rate still remains at 60Hz

This usually means the graphics driver you are using does not support the higher refresh rate for that resolution setting.
Maybe someone with an Intel graphics card can give advice on better driver to use.
What Intel graphics does your computer have?

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Wed 20 Jul 2011, 18:12    Post subject:  

In Quickpet Driver's tab when I click "Click here to test you graphics card" icon, it gives a message that
Quote:
Puppy Recommends:
For your Intel video card, Intel Corporation 82Q963/Q965 Integrated Graphics Controller (rev 02) we think the best add on driver is Xorg_High. It would be required for some programs and games with high graphical content and your desktop might seem a bit more snappy. Your selection should be below or there are other versions in PPM and Quickpet
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Béèm


Joined: 21 Nov 2006
Posts: 11782
Location: Brussels IBM Thinkpad R40, 256MB, 20GB, WiFi ipw2100. Frugal Lin'N'Win

PostPosted: Wed 20 Jul 2011, 19:01    Post subject:  

This doesn't guarantee that this linux driver has the capability to drive your card at 75Hz as W7 does.

What is exactly the problem to run at 60Hz?

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Peterm321

Joined: 29 Jan 2009
Posts: 244

PostPosted: Thu 21 Jul 2011, 00:00    Post subject:  

Sorry for being a console fan, I sometimes find the console more convenient for solving technical problems.

When I want to switch resolutions I tend to use the xrandr program (/usr/X11R7/bin/xrandr). Typing xrandr on its own produces a list of resolutions and refresh rates, e.g on my system typing xrandr produces



Code:

Screen 0: minimum 320 x 175, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
   1024x768       75.0*    85.0     70.0     60.0     87.0 
   800x600        85.0     75.0     72.0     60.0     56.0 
   640x480        75.0     85.0     73.0     60.0 
   832x624        75.0 
   800x512        60.0 
   720x400        85.0 
   640x512        60.0 
  [ .... ]


The default setting as per above is 1024x768 @ 75.0 refresh rate.

A minimum of 60 and maximum of 87 is available. To change the resolution the command is

Code:
xrandr -s <size> -r <rate>


The size can be a single integer that relates to the lines that xrandr without arguments outputs. For example 1024x768 is line 0 in the above example.

To change the refresh rate to 1024x768 @ 85, the command is

Code:
xrandr -s 0 -r 85


To change the resolution to 640x480 @ 60 Hz the command is

Code:
xrandr -s 2 -r 60
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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Thu 21 Jul 2011, 08:45    Post subject:  

Thanks a lot Peterm321
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s3u

Joined: 27 Jun 2011
Posts: 43

PostPosted: Thu 21 Jul 2011, 09:05    Post subject:  

One more thing,
are these settings are permanent.?
Because I have restarted the system and the refresh rate went back to 60Hz.
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Peterm321

Joined: 29 Jan 2009
Posts: 244

PostPosted: Thu 21 Jul 2011, 12:30    Post subject:  

xrandr only sets the resolution for the current session, AFAIK some versions of PuppyLinux allow the xrandrshell (a graphical front-end to xrandr) utility to store resolutions which are stored somewhere in the /etc folder. I used to use it to keep resolutions between restarts of Xorg/Xvesa when using a live CD.

There is a nifty looking utility similar to xrandrshell shown in Barry Kauler's blog at http://bkhome.org/blog/?viewDetailed=01881

It is also possible to edit /etc/X11/xorg.conf to set resolution & refresh rate if you know what you are doing.
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bigpup


Joined: 11 Oct 2009
Posts: 5482
Location: Charleston S.C. USA

PostPosted: Thu 21 Jul 2011, 12:32    Post subject:  

Peterm321,

Not sure if your method really works for all video cards.

I can use xorgwizard to select 1280X1024 @ 60 HZ
And it seems to give me that.

Xorg.conf entry

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
Option "metamodes" "1280x1024_60 +0+0" #METAMODES_0
Subsection "Display"
Depth 24
Modes "1280x1024"

As you can see below. My xrandr does not even show that 60HZ refresh option.

Graphics card adjustment and driver selection is a black art. Nothing ever seems to be a simple answer.

Your method seems to not work for me.

sh-4.1# xrandr
Screen 0: minimum 320 x 240, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
1280x1024 50.0* 51.0
1280x960 52.0
1152x864 53.0 54.0 55.0 56.0
1024x768 57.0 58.0 59.0 60.0
960x600 61.0
960x540 62.0
840x525 63.0 64.0 65.0
832x624 66.0
800x600 67.0 68.0 69.0 70.0 71.0
800x512 72.0
720x450 73.0
680x384 74.0 75.0
640x512 76.0 77.0
640x480 78.0 79.0 80.0 81.0
576x432 82.0 83.0 84.0 85.0
512x384 86.0 87.0 88.0
416x312 89.0
400x300 90.0 91.0 92.0

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
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Peterm321

Joined: 29 Jan 2009
Posts: 244

PostPosted: Fri 22 Jul 2011, 04:28    Post subject:  

Quote:

bigpup wrote


Peterm321,

Not sure if your method really works for all video cards.

I can use xorgwizard to select 1280X1024 @ 60 HZ
And it seems to give me that.

Xorg.conf entry

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
Option "metamodes" "1280x1024_60 +0+0" #METAMODES_0
Subsection "Display"
Depth 24
Modes "1280x1024"

As you can see below. My xrandr does not even show that 60HZ refresh option.

Graphics card adjustment and driver selection is a black art. Nothing ever seems to be a simple answer.

Your method seems to not work for me.

sh-4.1# xrandr
[....]




I can't give authorative advice because configurations vary from system to system. I take it as read you have made sure that it is Xorg (not Xvesa) that is being run. If you are not 100% sure Check

ls -l /usr/X11R7/bin/X

there is also a utility called ddcprobe which returns information about the video and display resolutions. On my system it is located at
/usr/sbin/ddcprobe

With reference to Xorg I would search the Internet for the search string "xorg.conf" +<your graphics card> [ to find sample xorg.conf files for your configuration].

and

"xorg.conf" +<your monitor model>

The video display unit model number may be relevant particularly if it is a CRT.

NB there is also a section in /etc/X11/xorg.conf to tell Xorg what refresh rates the video monitor uses, for me it is:

Code:

Section "Monitor"
    # HorizSync source: xconfig, VertRefresh source: xconfig
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "CRT-0"
    HorizSync       30.0 - 70.0
    VertRefresh     50.0 - 120.0
    Option         "DPMS"
EndSection
#



Providing this information may augment the detection of refresh rates.
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