Bug 70053 - hard machine hang when switching to battery power with DPM enabled on Trinity APU
Summary: hard machine hang when switching to battery power with DPM enabled on Trinity...
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Default DRI bug account
QA Contact:
URL:
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Reported: 2013-10-02 20:37 UTC by Lucas Stach
Modified: 2014-05-21 11:59 UTC (History)
0 users

See Also:
i915 platform:
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Attachments
dmesg before hang (94.64 KB, text/plain)
2013-10-02 20:37 UTC, Lucas Stach 		no flags Details
Xorg.0.log (44.09 KB, text/plain)
2013-10-02 20:38 UTC, Lucas Stach 		no flags Details
possible fix (1.48 KB, patch)
2013-10-02 21:47 UTC, Alex Deucher 		no flags Details | Splinter Review
force battery state on DC (1.54 KB, patch)
2013-10-03 14:11 UTC, Alex Deucher 		no flags Details | Splinter Review
better patch (2.29 KB, patch)
2013-10-03 14:29 UTC, Alex Deucher 		no flags Details | Splinter Review
Show Obsolete (1) View All

Description Lucas Stach 2013-10-02 20:37:52 UTC 
Created attachment 87002 [details]
dmesg before hang

When booting with DPM enabled the machine hard hangs when switching from AC to battery power or when booting without AC connected as soon as GDM starts.

I can't reach it via ssh after the hang, so only dmesg before hang provided. Kernel is 3.12-rc2 with agd5f/linux/drm-fixes-3.12 merged in.
Comment 1 Lucas Stach 2013-10-02 20:38:19 UTC 
Created attachment 87003 [details]
Xorg.0.log
Comment 2 Alex Deucher 2013-10-02 21:47:57 UTC 
Created attachment 87006 [details] [review]
possible fix

Does this patch help?  Seems like maybe your system isn't getting ac events properly.  Can you attach the dmesg output of this patch?
Comment 3 Lucas Stach 2013-10-02 22:10:51 UTC 
Yes, the patch fixes the immediate lockup. But it seems your analysis on why it fails isn't correct as I can now see your printks toggling between AC and DC when plugging in/out external power.
Comment 4 Alex Deucher 2013-10-03 14:11:17 UTC 
Created attachment 87033 [details] [review]
force battery state on DC

Does this patch also fix the problem?
Comment 5 Alex Deucher 2013-10-03 14:29:22 UTC 
Created attachment 87044 [details] [review]
better patch

Improved patch.  Please try this one instead.
Comment 6 Lucas Stach 2013-10-04 13:23:12 UTC 
No this patch (v2) does not solve the problem.
Comment 7 Lucas Stach 2014-05-21 11:59:56 UTC 
Already fixed in 3.12 final.

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