This is a note to my future self as much as to anyone else.
I own an old Yuraku MB24WKH screen which I never got to work via its DVI connector, but the VGA works just fine. It is for reading text, not gaming or image processing, so that's fine by me. Problem is, the internal ROM of the screen seems to be broken, at least it does not properly communicate the available modes to xorg in its EDID
I remember that some years ago I had a setup with a custom xorg.conf, involving an EDID file I had to extract and manually hex-edit. Try starting out from here if you're into that kind of thing.
Now, when I wanted to replicate that old setup, I found something much simpler instead:
creating a modeline in xrandr and manually assigning it to the screen at runtime.
The idea came from AskUbuntu and I found the matching modeline here (link in German) where someone has a more or less identical screen.
I was lucky enough to find the modeline there, since otherwise I would have to generate one by hand or with this generator for example.
Like this, it "just worked", as far as "just working" goes when you're setting your own modelines...
The result is this little script that I put into ~/bin and call whenever I want to connect that screen:
1 2 3 4 5 6 7 8 9 10 11 12 | #! /bin/sh
# this adds a mode to my broken yuraku mb24wkh screen to use it in full HD mode.
# this is necessary since the EDID is broken and
# it doesn't communicate the available modes correctly.
xrandr --newmode "1920x1200" 154.000 1920 1968 2000 2080 1200 1203 1209 1235
xrandr --addmode VGA-1 1920x1200
# I'm lazy. If I call this script I probably want the screen to be attached anyway
xrandr --output VGA-1 --right-of LVDS-1
xrandr --output VGA-1 --mode "1920x1200"
|
For reference and to avoid a "dead link, info gone" scenario, I copy that other dude's screen info from his original post:
Monitor
Model name............... MB24W
Manufacturer............. NTS
Plug and Play ID......... NTS0000
Serial number............
Manufacture date......... 2007, ISO week 31
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. RGB color
Screen size.............. 510 x 320 mm (23.7")
Power management......... Active off/sleep
Extension blocs.......... 1 (CEA-EXT)
-------------------------
DDC/CI................... Supported
MCCS revison............. 2.0
Display technology....... TFT
Controller............... Novatek 0x0
Firmware revision........ 1.0
Active power on time..... Not supported
Current frequency........ 16711.68kHz, 0.00Hz
Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.653 - Ry 0.337
Green chromaticity....... Gx 0.295 - Gy 0.607
Blue chromaticity........ Bx 0.144 - By 0.075
White point (default).... Wx 0.313 - Wy 0.329
Additional descriptors... None
Timing characteristics
Horizontal scan range.... 30-74kHz
Vertical scan range...... 50-61Hz
Video bandwidth.......... 160MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1200p at 60Hz (16:10)
Modeline............... "1920x1200" 154.000 1920 1968 2000 2080 1200
1203 1209 1235 +hsync -vsync
Standard timings supported
640 x 480p at 60Hz - IBM VGA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
1024 x 768p at 60Hz - VESA
1280 x 800p at 60Hz - VESA STD
1280 x 1024p at 60Hz - VESA STD
1440 x 900p at 60Hz - VESA STD
1600 x 1200p at 60Hz - VESA STD
1680 x 1050p at 60Hz - VESA STD
1360 x 765p at 60Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1152 x 864p at 60Hz - VESA STD
EIA/CEA-861 Information
Revision number.......... 3
DTV underscan............ Not supported
Basic audio.............. Not supported
YCbCr 4:4:4.............. Not supported
YCbCr 4:2:2.............. Not supported
YCbCr 4:2:2.............. Not supported
Native formats........... 5
Detailed timing #1....... 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148.500 1920 2008 2052 2200 1080
1084 1089 1125 +hsync +vsync
Detailed timing #2....... 1920x1080i at 60Hz (16:9)
Modeline............... "1920x1080" 74.250 1920 2008 2052 2200 1080 1084
1094 1124 interlace +hsync +vsync
Detailed timing #3....... 1280x720p at 60Hz (16:9)
Modeline............... "1280x720" 74.250 1280 1390 1430 1650 720 725
730 750 +hsync +vsync
Detailed timing #4....... 720x576p at 50Hz (16:9)
Modeline............... "720x576" 27.000 720 732 796 864 576 581 586 625
-hsync -vsync
Detailed timing #5....... 720x480p at 60Hz (16:9)
Modeline............... "720x480" 27.000 720 736 798 858 480 489 495 525
-hsync -vsync
CE timings supported
1920 x 1080p at 60Hz - HDTV (16:9, 1:1) [Native]
1920 x 1080i at 60Hz - HDTV (16:9, 1:1) [Native]
1280 x 720p at 60Hz - HDTV (16:9, 1:1) [Native]
720 x 576p at 50Hz - EDTV (16:9, 64:45) [Native]
720 x 480p at 60Hz - EDTV (16:9, 32:27) [Native]
NB: NTSC refresh rate = (Hz*1000)/1001
Report information
Date generated........... 11/19/2008
Software revision........ 2.1.0.725
Raw data.................
00FFFFFFFFFFFF003A930000000000001F110103803320782A5AD5A7564B9B24
.........................
135054230800810081809500A940B3008BC081407140283C80A070B023403020
.........................
360006442100001A000000FC004D423234570A20202020202020000000FD0032
.........................
3D1E4A10000A202020202020000000FF000A202020202020202020202020018C
.........................
02030A05459085849283023A801871382D40582C4500A05A0000001E011D8018
.........................
711C1620582C2500A05A0000009E011D007251D01E206E285500A05A0000001E
.........................
8C0AD090204031200C405500C48E210000188C0AD08A20E02D10103E9600A05A
.........................
000000180000000000000000000000000000000000000000000000000000008C