Bug 94256 - [i915][gen4.5][4.5.0-rc2] Kernel panic on bootup - gen5_assert_iir_is_zero+0x42/0xa0 [i915]
Summary: [i915][gen4.5][4.5.0-rc2] Kernel panic on bootup - gen5_assert_iir_is_zero+0x...
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-02-23 01:00 UTC by Shawn Starr
Modified: 2017-07-24 22:42 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:

Attachments
Kernel stack of lockup (63.35 KB, text/plain)
2016-02-23 01:00 UTC, Shawn Starr 		no flags Details
fix-qemu-south-bridge-detection (1.62 KB, patch)
2016-02-23 09:58 UTC, Imre Deak 		no flags Details | Splinter Review
View All

Description Shawn Starr 2016-02-23 01:00:40 UTC 
Created attachment 121901 [details]
Kernel stack of lockup

Unable to boot with Linux 4.5-rcX kernels. Something seems to have broke in i915. Here is kernel crash info.

I have a Lenovo W500 Laptop (Gen4.5 GPU)

Kernel specifically right now is: 4.5.0-0.rc2.git2.2.fc24.x86_64

See attachment for kernel stack
Comment 1 Imre Deak 2016-02-23 09:58:59 UTC 
Created attachment 121914 [details] [review]
fix-qemu-south-bridge-detection

The driver misdetects PCH on your machine.

Could you provide a log booting with drm.debug=14? Also the output of lspci -nv (booting with nomodeset)?

Attached is a patch from -rc3 that fixes a similar issue, please give it a try.
Comment 2 Imre Deak 2016-02-24 18:09:08 UTC 
Closing it based on the IRC feedback:
11:12 < spstarr> thanks, -rc3+ fixes gen4.5 detection

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