[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: monitor detection maybe not working

Paul Scott <waterhorse@ultrasw.com> wrote:
>On 07/01/2011 03:46 PM, Brian wrote:
>> On Fri 01 Jul 2011 at 15:19:21 -0700, Paul Scott wrote:
>>>     1024x768       60.0*
>>>     800x600        60.3     56.2
>>>     848x480        60.0
>>>     640x480        59.9
>>> My LCD monitor's native resolution is 1280x1024
>> xrandr believes VGA-1 is only capable of 1024x768.  Why do you believe
>> 1280x1024 is possible?
>1.  The monitor keeps telling me it works better at 1280x1024.
>2.  ddcprobe gives several 1280x1024 choices.

>> [sudo] password for paul:
>> vbe: VESA 3.0 detected.
>> oem:
>> vendor: NVIDIA Corporation
>> product: CR17 Board Chip Rev A3
>> memory: 32768kb
>> mode: 640x400x256
>> mode: 640x480x256
>> mode: 800x600x16
>> mode: 800x600x256
>> mode: 320x200x64k
>> mode: 320x200x16m
>> mode: 640x480x64k
>> mode: 640x480x16m
>> mode: 800x600x64k
>> mode: 800x600x16m

>> timing: 720x400@70 Hz (VGA 640x400, IBM)
>> timing: 720x400@88 Hz (XGA2)
>> timing: 640x480@60 Hz (VGA)
>> timing: 640x480@67 Hz (Mac II, Apple)
>> timing: 640x480@72 Hz (VESA)
>> timing: 640x480@75 Hz (VESA)
>> timing: 800x600@60 Hz (VESA)
>> timing: 800x600@72 Hz (VESA)
>> timing: 800x600@75 Hz (VESA)
>> timing: 832x624@75 Hz (Mac II)
>> timing: 1024x768@87 Hz Interlaced (8514A)
>> timing: 1024x768@70 Hz (VESA)
>> timing: 1024x768@75 Hz (VESA)
>> timing: 1280x1024@75 (VESA)
>> ctiming: 1280x1024@60
>> ctiming: 1280x960@60
>> ctiming: 1152x864@75
>> ctiming: 1024x768@85
>> ctiming: 800x600@85
>> ctiming: 640x480@85
>> dtiming: 1280x1024@70

It appears to me that the appropriate mode is missing. You could try
to add it manually (information taken from
http://wiki.debian.org/XStrikeForce/HowToRandR12 Section III.5):

xrandr --newmode "1280x1024_75"  138.54  1280 1368 1504 1728  1024 1025 1028 1069  -HSync +Vsync

and then do

xrandr --output VGA-1 --mode 1280x1024_75

This could work, if the above modeline was actually correct and not
just an example. I don’t know wether it should work, as I don’t have
any screen of that size at the moment to test with. You might also
try to play with +HSync and -Vsync (or any combination of the two) if
you experience short blackouts (my Samsung SyncMaster T240 doesn’t
like +Hsync -Vsync but is totally happy with +Hsynv +Vsync…).

If it does work, you can write a small script with these
two commands to set up the display resolution automatically at
startup and add this script to your DE’s autostart configuration.

Please notice that I can’t guarantee it won’t blow up your computer :)

Best regards,

audiophile, n:
	Someone who listens to the equipment instead of the music.
Please use GPG: ECB0C2C7 4A4C4046 446ADF86 C08112E5 D72CDBA4
http://chubig.net/ http://nightfall.org

Reply to: