Radeon hybrid graphics problem on resume
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Tim Gardner | ||
Trusty |
Fix Released
|
Undecided
|
Unassigned | ||
Vivid |
Fix Released
|
Undecided
|
Unassigned | ||
Wily |
Fix Released
|
Undecided
|
Unassigned | ||
Xenial |
Fix Released
|
Undecided
|
Tim Gardner | ||
linux-lts-utopic (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Trusty |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
From mainline commit 256faed: Revert "drm/radeon: call hpd_irq_event on resume"
(Ubuntu kernels T, U, V, W, and X carry the patch to be reverted).
-----
commit 256faedcfd64616
Author: Linus Torvalds <email address hidden>
Date: Mon Mar 7 13:15:09 2016 -0800
Revert "drm/radeon: call hpd_irq_event on resume"
This reverts commit dbb17a21c131eca
It turns out that commit can cause problems for systems with multiple
GPUs, and causes X to hang on at least a HP Pavilion dv7 with hybrid
graphics.
This got noticed originally in 4.4.4, where this patch had already
gotten back-ported, but 4.5-rc7 was verified to have the same problem.
Alexander Deucher says:
"It looks like you have a muxed system so I suspect what's happening is
that one of the display is being reported as connected for both the
IGP and the dGPU and then the desktop environment gets confused or
there some sort problem in the detect functions since the mux is not
switched to the dGPU. I don't see an easy fix unless Dave has any
ideas. I'd say just revert for now"
Reported-by: Jörg-Volker Peetz <email address hidden>
Acked-by: Alexander Deucher <email address hidden>
Cc: Dave Airlie <email address hidden>
Cc: <email address hidden> # wherever dbb17a21c131 got back-ported
Signed-off-by: Linus Torvalds <email address hidden>
CVE References
Changed in linux (Ubuntu Xenial): | |
assignee: | nobody → Tim Gardner (timg-tpi) |
status: | New → Fix Committed |
Changed in linux (Ubuntu Wily): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu Vivid): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu Trusty): | |
status: | New → Fix Committed |
no longer affects: | linux-lts-utopic (Ubuntu Xenial) |
no longer affects: | linux-lts-utopic (Ubuntu Wily) |
no longer affects: | linux-lts-utopic (Ubuntu Vivid) |
Changed in linux-lts-utopic (Ubuntu Trusty): | |
status: | New → Fix Committed |
Changed in linux-lts-utopic (Ubuntu): | |
status: | New → Invalid |
This bug was fixed in the package linux - 4.4.0-12.28
---------------
linux (4.4.0-12.28) xenial; urgency=low
* Miscellaneous Ubuntu changes
- reconstruct: Work around orig tarball packaging limitiations
Fixes FTBS
-- Tim Gardner <email address hidden> Tue, 08 Mar 2016 13:26:08 -0700