https://bugs.freedesktop.org/show_bug.cgi?id=97260
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 at lists.freedesktop.org
Reporter: magolobel at 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.
--
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/dri-devel/attachments/20160809/996ef7c5/attachment.html>
