| 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 | lbdkmjdf@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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