Beagleboard XM: only widescreen monitor working

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1

I get my XM only running with widescreen monitor. I have tried several
resolutions from boot.cmd. For example 1024x768MR-16@60 etc and then
mkimage it to boot.scr. This changes the resolution but still I can
not get the my other monitors to recognize the signal.

My widescreen monitor is quite new acer, but I have also one chinese
open frame LCD module which I really would like to make work. I have
also tested one older dell monitor but without success.

Anyone can give any hints what is the problem. I'm using debian
squeeze.

Thank you,

Mikko

2

Anyone got any ideas at all? What could I try?
I'm stuck with this problem.

Thanks.

-Mikko

3

What are the model numbers of your other monitors?

Gerald

4

Gerald, thanks for reply.

I have tried: Dell 2007FPb, Dell 1504FP and one Chinese LCD + driver
module.
These are 4:3 display and do not recognize the signal.

Then widescreens: Packard Bell Maestro 242DX and one Acer widescreen
works fine.

Maybe my BB is faulty?

-Mikko

5

I can’t see how the board can be faulty. All the timings and control are handled in the SW. If the board was damaged, it would not work on any monitor. I would look for a timing issue in the settings of the display driver.

Gerald

6

I have tried timings from http://www.omappedia.org/wiki/Bootargs_for_enabling_display

For example echo "25175,640/96/16/48,480/7/3/4" > /sys/devices/
platform/omapdss/display0/timings
I have used several values from the following table:

Code Mode Timing values Refresh Rate
4(0x4) 0 {640, 480, 25175, 96, 16, 48, 2 , 11, 31} 60Hz
9(0x9) 0 {800, 600, 40000, 128, 40, 88, 4 , 1, 23} 60Hz
14(0xE) 0 {848, 480, 33750, 112, 16, 112, 8 , 6, 23} 60Hz
23(0x17) 0 {1280, 768, 71000, 128, 64, 192, 7 , 3, 20} 60Hz
28(0x1C) 0 {1280, 800, 83500, 128, 72, 200, 6 , 3, 22} 60Hz
39(0x27) 0 {1360, 768, 85500, 112, 64, 256, 6 , 3, 18} 60Hz
32(0x20) 0 {1280, 960, 108000, 112, 96, 312, 3 , 1, 36} 60Hz
35(0x23) 0 {1280, 1024, 108000, 112, 48, 248, 3 , 1, 38} 60Hz
16(0x10) 0 {1024, 768, 65000, 136, 24, 160, 6, 3, 29} 60Hz
42(0x2A) 0 {1400, 1050, 121750, 144, 88, 232, 4, 3, 32} 60Hz
47(0x2F) 0 {1440, 900, 106500, 152, 80, 232, 6, 3, 25} 60Hz
58(0x3A) 0 {1680, 1050, 146250, 176 , 104, 280, 6, 3, 30} 60Hz
81(0x51) 0 {1366, 768, 85500, 143, 70, 213, 3, 3, 24} 60Hz
82(0x52) 0 {1920, 1080, 148500, 44, 88, 80, 5, 4, 36} 60Hz
22(0x16) 0 {1280, 768, 68250, 32, 48, 80, 7, 3, 12} 60Hz
41(0x29) 0 {1400, 1050, 101000, 32, 48, 80, 4, 3, 23} 60Hz
57(0x39) 0 {1680, 1050, 119000, 32, 48, 80, 6, 3, 21} 60Hz
1 1 {640, 480, 25200, 96, 16, 48, 2, 10, 33} 60Hz
19 1 {1280, 720, 74250, 40, 440, 220, 5, 5, 20} 50Hz
4 1 {1280, 720, 74250, 40, 110, 220, 5, 5, 20} 59.94HZ
2 1 {720, 480, 27000, 62, 16, 60, 6, 9, 30} 59.94HZ
37 1 {2880, 576, 108000, 256, 48, 272, 5, 5, 39} 50HZ
6 1 {1440, 480, 27000, 124, 38, 114, 3, 4, 15} 59.94Hz
21 1 {1440, 576, 27000, 126, 24, 138, 3, 2, 19} 50Hz
20 1 {1920, 1080, 74250, 44, 528, 148, 2, 5, 15} 50Hz
5 1 {1920, 1080, 74250, 44, 88, 148, 2, 5, 15} 60Hz
16 1 {1920, 1080, 148500, 44, 88, 148, 5, 4, 36} 60Hz
17 1 {720, 576, 27000, 64, 12, 68, 5, 5, 39} 50Hz
29 1 {1440, 576, 54000, 128, 24, 136, 5, 5, 39} 50Hz
31 1 {1920, 1080, 148500, 44, 528, 148, 5, 4, 36} 50Hz
35 1 {2880, 480, 108000, 248, 64, 240, 6, 9, 30} 59.94Hz

With widescreen monitors I'm able to get image most of the time (not
perfect usually, but I see something at least) but my 4:3 monitors
does not recognize the signal.

Do you know any other way how I could play around with the timings?

7

Here are the ones we have tested on. We are trying a Dell 1503 now.

Gerald