https://bugs.freedesktop.org/show_bug.cgi?id=98988
Bug ID: 98988
Summary: [Regression, bisected] New BONAIRE UVD firmware causes
DPM problems and extremely slow performance
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Radeon
Assignee: dri-devel at lists.freedesktop.org
Reporter: falaca at gmail.com
Created attachment 128327
--> https://bugs.freedesktop.org/attachment.cgi?id=128327&action=edit
Kernel bisect log
I have a 2GB Radeon R7 260X (BONAIRE).
With kernel 4.7 and above, I was experiencing extremely slow performance. Even
desktop animations on Ubuntu 16.04 w/ Unity desktop are extremely choppy,
probably about 10fps.
dmesg produces several instances of the following error message:
[drm:ci_dpm_set_power_state [radeon]] *ERROR* ci_upload_dpm_level_enable_mask
failed
I did a kernel bisect, and narrowed the problem to the following commit:
http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=7050c6ef5f0e9bc5e6bf9eb035320b70f731b919
The bisect log is attached.
It seems that the commit adds support for a new firmware file,
"bonaire_uvd.bin". If the driver fails in loading the new firmware file, it
falls back to the legacy file, "BONAIRE_uvd.bin".
To confirm that the issue is caused by the new firmware, I deleted
bonaire_uvd.bin, and performance is restored to normal with the latest stable
kernel (4.9.0-rc7).
For what it's worth, here are the contents of
/sys/kernel/debug/dri/64/radeon_pm_info while idling on the Ubuntu desktop with
the new firmware:
uvd disabled
vce disabled
power level avg sclk: 115774 mclk: 15000
And the old firmware:
uvd disabled
vce disabled
power level avg sclk: 30248 mclk: 165000
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