Bug 85171 - Hang on boot in 3.17+
Summary: Hang on boot in 3.17+
Status: RESOLVED DUPLICATE of bug 86551
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: All Linux
: P1 blocking
Assignee: intel-gfx-bugs@lists.freedesktop.org
URL:
Keywords:
Depends on:
Blocks: 84221
  Show dependency tree
 
Reported: 2014-09-26 07:09 UTC by brent s.
Modified: 2014-10-23 16:22 UTC (History)
2 users (show)

See Also:
Kernel Version: 3.17+
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
/sys/kernel/debug/dri/0/i915_opregion (8.00 KB, application/octet-stream)
2014-10-23 15:00 UTC, brent s. 		Details
Add an attachment (proposed patch, testcase, etc.)

Description brent s. 2014-09-26 07:09:54 UTC 
While trying a patch for Bug #84221, the kernel in 3.17 series hangs on boot.

The boot screen can be seen here: https://bugzilla.kernel.org/attachment.cgi?id=150961

dmidecode and lspci output are in but #84221.
Comment 1 Aaron Lu 2014-10-17 01:43:58 UTC 
Mark it as a regression according to brent: https://bugzilla.kernel.org/show_bug.cgi?id=84221#c27
Comment 2 brent s. 2014-10-23 10:17:38 UTC 
since nobody's apparently doing anything for this bug, which has now hit my distro's mainstream, i did a bit more troubleshooting.

it does not hang if i append the nomodeset kernel paramater, so it seems to me to be related to DR(I/M)/KMS. indeed, it hangs on the drmfb loading when i enable the "debug" kernel parameter.

(of course, then the resolutions for both the TTY and the graphical environment are a wonky horrible 640x480 or so)
Comment 3 Jani Nikula 2014-10-23 14:10:52 UTC 
Following a hunch, please attach /sys/kernel/debug/dri/0/i915_opregion.
Comment 4 Jani Nikula 2014-10-23 14:12:11 UTC 
Can be copied running any kernel.
Comment 5 brent s. 2014-10-23 15:00:32 UTC 
Created attachment 154671 [details]
/sys/kernel/debug/dri/0/i915_opregion
Comment 6 Jani Nikula 2014-10-23 16:22:25 UTC 
Hunch FTW. Thanks for the report, we're on this.

*** This bug has been marked as a duplicate of bug 86551 ***
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