https://bugzilla.kernel.org/show_bug.cgi?id=79701
Bug ID: 79701
Summary: Dual AMD graphics systems broken by PCIe hotplug in
kernel 3.15+
Product: ACPI
Version: 2.5
Kernel Version: 3.15
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Hotplug
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 142551
--> https://bugzilla.kernel.org/attachment.cgi?id=142551&action=edit
dmesg
Systems that have dual AMD graphics (APU + dedicated GPU) and use the radeon
open source drivers become unusable with kernel 3.15-rc and after, freezing
every few seconds.
I talked to a radeon dev (Alex Deucher, agd5f at #radeon in irc.freenode.net)
about this problem, and, If I understood correctly, he said it's a problem with
PCIEHP. There is a patch to fix this, but it's for another module, ACPIPHP...
for some reason, PCIEHP is loading (instead of ACPIPHP? not sure) in kernels
3.15+, and this module has not been patched.
This is the patch:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f244d8b623dae7a7bc695b0336f67729b95a9736
A workaround is to add "radeon.runpm=0" to the kernel command line.
Logs from IRC, sorted by date (I'm "pepee"):
http://people.freedesktop.org/~cbrill/dri-log/?channel=radeon&date=2014-06-09#t-1138
http://people.freedesktop.org/~cbrill/dri-log/?channel=radeon&date=2014-06-24#t-1847
(read the last 4 lines)
http://people.freedesktop.org/~cbrill/dri-log/?channel=radeon&date=2014-07-08#t-1329
Here are more reports:
https://bbs.archlinux.org/viewtopic.php?pid=1431648
https://bbs.archlinux.org/viewtopic.php?pid=1433713
Hope this helps.
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