Bug 91243

Summary: [bdw iommu?] GPU Hang on 4.1.1
Product: DRI Reporter: Edgardo Gho <edgardo.g>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WORKSFORME QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: XOrg git   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: BDW i915 features: GPU hang
Attachments:
Description Flags
Error log
none
dmesg
none
Kernel config file none

Description Edgardo Gho 2015-07-06 15:13:55 UTC 
Created attachment 116974 [details]
Error log

I compiled Kernel 4.1.1 for a Dell Inspiron 3543.
Ubuntu 15.04 (with kernel 3.19.0-15) seems to work OK with it.
My compiled kernel has this GPU hang.
Comment 1 Edgardo Gho 2015-07-06 15:14:34 UTC 
Created attachment 116975 [details]
dmesg
Comment 2 Edgardo Gho 2015-07-06 15:15:08 UTC 
Created attachment 116976 [details]
Kernel config file
Comment 3 Chris Wilson 2015-07-07 12:17:21 UTC 
Suspect here is iommu. Could you please try rebooting with intel_iommu=igfx_off on your kernel command line.
Comment 4 Edgardo Gho 2015-07-08 17:44:56 UTC 
Yes,
Using intel_iommu=igfx_off seems to fix the problem.

I also had to update to a newer X (I was using 1.14). Using 1.17 I have a weird problem with xf86-video-intel. Videos (like camera input) or VLC diplay with artifacts. Does not happen if I use modeset for Xorg (instead of intel).

Thanks for the info on intel_iommu=igfx_off.

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