Bug 31688

Summary: Displayport disapeared (HD5750) at 2.6.37-rc2-git2
Product: xorg Reporter: Felix Blanke <felixblanke>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: major    
Priority: medium    
Version: 7.4 (2008.09)   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Felix Blanke 2010-11-17 14:10:29 UTC 
Hi,

I updated today from kernel 2.6.37-rc1-git11 to 2.6.37-rc2-git2. Now my displayport isn't shown up in xrandr anymore and the connected display has no signal.

I switched back to 2.6.37-rc1-git11 and it does work again now.

xf86-video-ati: beb7fecd0191e38fb238134ba612985062cf9770
xorg-server: 1.9.2.901
xorg-x11: 7.4-r1

I'll post a dmesg from the not working 2.6.37-rc2-git2 after the next reboot. If you need any other informations just let me know.
Comment 1 Alex Deucher 2010-11-17 14:18:09 UTC 
Can you bisect to see what commit broke it?
Comment 2 Felix Blanke 2010-11-17 14:23:54 UTC 
You're talking about to bisect the kernel, right?

I've never did a bisect, but I can try. First I'll have to pull the kernel sources from git, because I'm actually using a version from my repository (gentoo) where I don't have to pull the sources manually.
Comment 3 Alex Deucher 2010-11-17 14:27:08 UTC 
Looks like it's related to core i2c changes:
http://lists.freedesktop.org/archives/dri-devel/2010-November/005556.html
Comment 4 Felix Blanke 2010-11-17 14:36:15 UTC 
Thanks for that hint.

I'll look at the dmesg after the next reboot. If my problem is the same (I'm quite sure it will be) I'll not do that bisect. If it differs I'll bisect :)
Comment 5 Felix Blanke 2010-11-18 01:27:57 UTC 
That is that i2c problem:

[    6.357759] i2c-core: Attempt to register an adapter with no name!
[    6.357761] [drm] Failed to register i2c DP-auxch
[    6.357867] [drm] Radeon Display Connectors
[    6.357868] [drm] Connector 0:
[    6.357869] [drm]   HDMI-A
[    6.357870] [drm]   HPD5
[    6.357872] [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[    6.357873] [drm]   Encoders:
[    6.357875] [drm]     DFP2: INTERNAL_UNIPHY2
[    6.357876] [drm] Connector 1:
[    6.357877] [drm]   DVI-I
[    6.357878] [drm]   HPD1
[    6.357879] [drm]   DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468 0x646c 0x646c
[    6.357880] [drm]   Encoders:
[    6.357881] [drm]     DFP3: INTERNAL_UNIPHY1
[    6.357883] [drm]     CRT2: INTERNAL_KLDSCP_DAC2
[    6.357884] [drm] Connector 2:
[    6.357885] [drm]   DVI-I
[    6.357886] [drm]   HPD6
[    6.357887] [drm]   DDC: 0x6450 0x6450 0x6454 0x6454 0x6458 0x6458 0x645c 0x645c
[    6.357888] [drm]   Encoders:
[    6.357892] [drm]     DFP4: INTERNAL_UNIPHY
[    6.357893] [drm]     CRT1: INTERNAL_KLDSCP_DAC1


Feel free to close this bug if this is not your problem. Or ask me for any kind of information.

I think a bisect isn't needed anymore because you allready know the commit which causes that problem.

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