Workaround for dw_dmac causing random hang when booting
Bug #1501580 reported by
Phidias
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Phidias | ||
linux (Ubuntu) |
Incomplete
|
Medium
|
Phidias | ||
Vivid |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
On HP X360, we've found dw_dmac hangs system when booting with very high fail rate (~80%). System can not turn power off when shutting down either if dw_dmac is loaded.
The maintainer from Intel is proposing a patch to fix this issue, but won't be available until 4.3 or 4.4, and there're users already hit this problem[1], so we proposed a temporarily workaround to skip probing in dw_dmac by returning -ENODEV directly if DMI_PRODUCT_NAME matches HP X360 before the fix is ready.
Related branches
tags: | added: vivid |
Changed in linux (Ubuntu): | |
assignee: | nobody → Phidias (phidias-chiang) |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu): | |
status: | Incomplete → Fix Committed |
Changed in linux (Ubuntu Vivid): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu): | |
status: | Fix Committed → New |
Changed in linux (Ubuntu): | |
status: | New → Incomplete |
Changed in hwe-next: | |
status: | New → Fix Released |
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This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1501580
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.