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irasnyd
Apprentice
Joined: 16 Feb 2003
Posts: 286
Location: Placentia, CA
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 Posted: Tue Apr 22, 2003 6:35 am Post subject: Setting Framebuffer refresh rate |
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Right now my framebuffer is working, but I'd like to be able to set the refresh rate to 75Hz, instead of the 60Hz it's running it.
Thanks,
irasnyd |
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M.A.
Apprentice
Joined: 21 Mar 2003
Posts: 168
Location: /home/España/Valencia
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| Posted: Tue Apr 22, 2003 9:04 am Post subject: |
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Play with fbset until you get what you want (man fbset).
See http://en.tldp.org/HOWTO/Framebuffer-HOWTO-18.html
In my 19" monitor I have 1280x1024 at 81 Hz using these settings:
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fbset -pixclock 6000 -left 370 -right 0 -hslen 100 -upper 120 -lower 0 -vslen 30 -xres 1280 -vxres 1280 -yres 1024 -vyres 1024
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Hope this helps. |
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allucid
Veteran
Joined: 02 Nov 2002
Posts: 1314
Location: atlanta
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| Posted: Tue Apr 22, 2003 2:56 pm Post subject: |
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| what fb driver are you using? (i.e. does this work with vesa? radeonfb? etc.) |
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irasnyd
Apprentice
Joined: 16 Feb 2003
Posts: 286
Location: Placentia, CA
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| Posted: Tue Apr 22, 2003 5:44 pm Post subject: |
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I found out the values I needed (according to that guide).
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pixclock=12714
left_margin=128
right_margin=32
upper_margin=16
lower_margin=4
hsync_len=128
vsync_len=4
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I have tried setting these with fbset, and they do take effect, but there is no difference. My display is still at 60Hz then. I'm not really sure what I need to change to make my refresh rate higher.
irasnyd
PS - I'm using the vesa framebuffer, but I have a Radeon9700 Pro. |
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peterk0
Apprentice
Joined: 25 Mar 2003
Posts: 188
Location: Prague
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| Posted: Tue Apr 22, 2003 7:31 pm Post subject: |
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I would also like to know how to set refresh rate especially with vesa, cause it seem that with other fb drivers it is as simple as
| Code: | | video=<driver>fb:<resolution>-<refresh rate> |
in grub.conf ...
but does it work with vesafb? |
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allucid
Veteran
Joined: 02 Nov 2002
Posts: 1314
Location: atlanta
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| Posted: Tue Apr 22, 2003 11:29 pm Post subject: |
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| i think i read in the kernel documentation that vesafb is only capable of displaying at 60hz. when i tried radeonfb i could not get it to change refresh rates through my grub.conf either. as far as i can tell, all the fb drivers just ignore the refresh rate specified in your grub.conf. |
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peterk0
Apprentice
Joined: 25 Mar 2003
Posts: 188
Location: Prague
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| Posted: Wed Apr 23, 2003 6:11 am Post subject: |
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Well, that thing about 60hz... not true
I got 75hz at 800x600, but only 60hz at 1024x768...
I need 85hz at 1024x768, i'm sure it's possible, but maybe not with Vesa 
(My monitor is capable ofcourse...  ) |
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