Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
EDID and HowTo make one
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware
View previous topic :: View next topic  
Author Message
krax
n00b
n00b


Joined: 29 May 2011
Posts: 67
Location: Troy, MI

PostPosted: Mon Oct 21, 2013 5:02 pm    Post subject: EDID and HowTo make one Reply with quote

Hello;
I read the Post here https://www.osadl.org/Single-View.111M591850c02b5.0.html ; and i tried to make do with what i understood from the post but here are some questions:
1. where is the /lib/firmware located ;in for example /usr/src/linux/lib/firmware or /usr/lib/firmware or elsewhere?
2.Could i use a pre-build EDID in that address the post gave and tweak it with an editor like Gvim and pass it to kernel using the info bellow; the resolution i am trying is 1600x900@60
Code:

  1: [H PIXELS RND]  :  1600.000000
  2: [V LINES RND]  :  450.000000
  3: [V FIELD RATE RQD]  :  120.000000
  4: [TOP MARGIN (LINES)]  :  8.000000
  5: [BOT MARGIN (LINES)]  :  8.000000
  6: [INTERLACE]  :  0.500000
  7: [H PERIOD EST]  :  16.648841
  8: [V SYNC+BP]  :  33.000000
  9: [V BACK PORCH]  :  30.000000
  10: [TOTAL V LINES]  :  500.500000
  11: [V FIELD RATE EST]  :  120.008471
  12: [H PERIOD]  :  16.650017
  13: [V FIELD RATE]  :  120.000000
  14: [V FRAME RATE]  :  60.000000
  15: [LEFT MARGIN (PIXELS)]  :  32.000000
  16: [RIGHT MARGIN (PIXELS)]  :  32.000000
  17: [TOTAL ACTIVE PIXELS]  :  1664.000000
  18: [IDEAL DUTY CYCLE]  :  25.004995
  19: [H BLANK (PIXELS)]  :  560.000000
  20: [TOTAL PIXELS]  :  2224.000000
  21: [PIXEL FREQ]  :  133.573440
  22: [H FREQ]  :  60.060000
  17: [H SYNC (PIXELS)]  :  176.000000
  18: [H FRONT PORCH (PIXELS)]  :  104.000000
  36: [V ODD FRONT PORCH(LINES)]  :  1.500000

if yes where could i get and edid.bin file?
3.Or should i build an edid file from scratch; if yes how could i make edid file.
Thanks
Back to top
View user's profile Send private message
eyoung100
Veteran
Veteran


Joined: 23 Jan 2004
Posts: 1411

PostPosted: Mon Oct 21, 2013 6:10 pm    Post subject: Reply with quote

What is your monitor type/brand etc :?:
_________________
The Birth and Growth of Science is the Death and Atrophy of Art -- Unknown
Registerd Linux User #363735
Adopt a Post | Strip Comments| Emerge Wrapper
Back to top
View user's profile Send private message
krax
n00b
n00b


Joined: 29 May 2011
Posts: 67
Location: Troy, MI

PostPosted: Tue Oct 22, 2013 5:00 am    Post subject: Reply with quote

Samsung SA300 over VGA100:02.0
VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09) { CONFIG_I915=y && CONFIG_I915_KMS=y }
KERNEL 3.10.7-gentoo-r1
Back to top
View user's profile Send private message
eyoung100
Veteran
Veteran


Joined: 23 Jan 2004
Posts: 1411

PostPosted: Tue Oct 22, 2013 2:23 pm    Post subject: Reply with quote

This may help: [Workaround] Define DisplaySize for External Monitor to Xorg Server
_________________
The Birth and Growth of Science is the Death and Atrophy of Art -- Unknown
Registerd Linux User #363735
Adopt a Post | Strip Comments| Emerge Wrapper
Back to top
View user's profile Send private message
salahx
Guru
Guru


Joined: 12 Mar 2005
Posts: 395

PostPosted: Wed Oct 23, 2013 6:08 am    Post subject: Reply with quote

KMS requires an EDID, and while you can override the EDID in org.conf, the plan is to get X11 away from the hardware and that will stop working. It is possible to override the EDID at the kernel level though. To do so, be sure CONFIG_DRM_LOAD_EDID_FIRMWARE is selected and passing drm_kms_helper.edid_firmware= one of the following 5 special parameters on the kernel command line, corresponding to the desired resolution:

    edid/1024x768.bin
    edid/1280x1024.bin
    edid/1600x1200.bin
    edid/1680x1050.bin
    edid/1920x1080.bin

Note that these values are hardcoded in the driver, there is no corresponding /lib/firmware file (although if it exists it will override the built-in ones)

It is possible to create custom EDID if needed: see Documentation/EDID/HOWTO.txt in the kernel sources for the details.
Back to top
View user's profile Send private message
krax
n00b
n00b


Joined: 29 May 2011
Posts: 67
Location: Troy, MI

PostPosted: Sun Oct 27, 2013 6:21 pm    Post subject: Reply with quote

I want to do in the kernel level because my problem is in tty mode and I want to know how to make (make file) (build) (compile) 1600*900 @60 from the source provided in the kernel git directory.
The main heck is providing numbers needed in source file; some could be find from CVT command but i don't now how and also the value for CRC also.
thanks
Back to top
View user's profile Send private message
salahx
Guru
Guru


Joined: 12 Mar 2005
Posts: 395

PostPosted: Wed Oct 30, 2013 4:09 am    Post subject: Reply with quote

It depends on what's causing your problem. If the problem is due to a KVM switch, the east solution is boot Linux without the switch fetch the EDID from from sysfs (Use 'find /sys -iname edid' to find it), then copy it to the firmware directory (/lib/firmware/edid/edid.bin) and boto that way.

Otherwise go to /usr/src/linux/Documentation/EDID; cppy 1024x768.S to 1600x900.S and edit the values 1600x900.S to suit. You can look into edid.S as to what some of the values mean. XPIX should be 1600, YPIX should be 900, XY_RATIO should be XY_RATIO_16_9; but as far as the other stuff goes i'd either leave it as is or use the results from your monitor.

You get the results from your monitor, grab the edid file from sysfs above and emerge the read-edid utility. It contains the programs parse-edid, which you will need for 2 things. The first is to fetch the values of your existing monitor. The second is to figure out what the CRC you your new DID need to be (if its wrong, it'll tell you the correct value, simply set CRC to that value and rebuild)
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum