| Bug ID | 97260 |
|---|---|
| Summary | R9 290 low performance in Linux 4.7 |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Keywords | regression |
| Severity | major |
| Priority | high |
| Component | DRM/Radeon |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | magolobel@yahoo.com.br |
Starting with Linux Kernel 4.7, the Radeon R9 290 started showing very low performance, about 20/30% of what is available up to kernel 4.6. As can be seen in this article, the performance regression started even before the launch of kernel 4.7 RC1, using Alex Deucher's drm-next-4.7 branch: http://www.phoronix.com/scan.php?page=article&item=radeon-drm-next-47&num=1 Some time later it was speculated that the problem may be with DPM: http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.7-R9-290-Regression To replicate the bug, install Ubuntu 16.04 64bits and install kernel 4.7 from here (preferably above rc5): http://kernel.ubuntu.com/~kernel-ppa/mainline/ The performance regression will show right away. Rebooting the system and choosing a kernel version up to 4.6 will fix the bug.
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