Bug 50374

Summary:	nouveau fails to obtain EDID from NV11 (nforce IGP)
Product:	xorg	Reporter:	Bruno <bonbons>
Component:	Driver/nouveau	Assignee:	Nouveau Project <nouveau>
Status:	RESOLVED DUPLICATE	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Bruno 2012-05-26 09:28:17 UTC

On an nforce1 based system nouveau (KMS) driver only used default (small) modes while attached monitor can do up to 1280x1024. Looking at /sys/class/drm/.../edid returns empty file.

System:
  Mainboard: MSI K7N420 Pro
  Monitor: Iiyama E431S, 1280x1024, connected with VGA
  Kernel is 3.4.0 (same applies to all older kernels tried).

System info (lspci, ioports, iomem) at attachment #33464 [details] of bug #26670, the Xorg.0.log and xorg.conf parts apply to past nv approach on that bug.

Comment 1 Ilya Ilyin 2012-07-07 07:49:31 UTC

use 
edid-decode /sys/class/drm/.../edid
to read the file

Comment 2 Bruno 2012-07-07 08:02:02 UTC

(In reply to comment #1)
> use 
> edid-decode /sys/class/drm/.../edid
> to read the file

That won't help as nouveau (and older UMS nv driver) are not getting I2C right (they don't know where the right I2C bus is located) to do the EDID transfer.

It's rather a matter of either finding out how nvidia closed driver knows where to look and replicating that or finding out where the I2C bus is for nforce/mainboard.

see also: bug #26670

Comment 3 Ilia Mirkin 2013-08-27 20:29:57 UTC

Is this bug identical to #26534 which you also filed? If not, could you describe in which way it is different?

Comment 4 Bruno 2013-08-27 20:47:15 UTC

(In reply to comment #3)
> Is this bug identical to #26534 which you also filed? If not, could you
> describe in which way it is different?

Looks like I forgot about the older bug filed at the same time as bug #26670 and opened this one when bug #26670 got closed because of xf86-video-nv being dropped.

*** This bug has been marked as a duplicate of bug 26534 ***

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