https://bugs.freedesktop.org/show_bug.cgi?id=69365
Priority: medium
Bug ID: 69365
Assignee: dri-devel@lists.freedesktop.org
Summary: vgaswitcheroo crashes when passing "OFF" to the
"switch" file
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: lbdkm...@sharklasers.com
Hardware: Other
Status: NEW
Version: unspecified
Component: DRM/Radeon
Product: DRI
I have an HP laptop with dual AMD graphics cards (radeon HD 6520g + HD 6750M)
running Ubuntu 13.10 beta1, kernel 3.11.0-7-generic amd64.
This command
# echo "OFF" > /sys/kernel/debug/vgaswitcheroo/switch
throws a WARNING in the kernel logs, after which the folder
/sys/kernel/debug/vgaswitcheroo/ and the dGPU disappear (as noted in the logs)
(and power usage is notably lowered, guessing from the temperatures).
dmesg: http://pastebin.com/Pb7ELyqP , lines 1196+
Someone else in the #radeon channel also found this report:
http://lists.freedesktop.org/archives/dri-devel/2013-September/045157.html
which links to another old report from the same person.
Thanks.
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