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HarlemSquirrel

Member

From: US-East

Registered: 2014-01-22

Posts: 130

Website

AMD R9 270X Flickering with DPM Enabled on Linux 4.1 with RadeonSI

I upgraded my system today from the 4.0 kernel to 4.1. After rebooting, I am getting crazy flickering that makes my system unusable. I rebooted and disabled dynamic power management with radeon.dpm=0 as a kernel parameter. The flickering is now gone. I have an R9270X running with the open source drivers. I did a quick search and could not find a similar issue anywhere. Does anyone have any suggestions?

I built the kernel using the linux-git package in AUR and have the same issue with DPM. linux-git 4.2rc7

dmesg reports...

[drm:si_dpm_set_power_state [radeon]] *ERROR* si_restrict_performance_levels_before_switch failed

I tried switching the connection to my monitor from DisplayPort to HDMI and I got...

[  317.193439] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage
[  317.193464] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed

Downgrading to linux 4.0.7-2-ARCH resolves this issue, so this seems to be a regression introduced with linux 4.1

I created this bug report: https://bugzilla.kernel.org/show_bug.cgi?id=103271

UPDATE 2015-09-06
I still have the problem with kernel 4.2-3 that is in testing. I am attempting to bisect but is my first shot at this. Wish me luck!

UPDATE 2015-09-15
I have learned quite a bit about bisecting kernels! I identified the fastest way to bisect and compile by enabling ccache with makepkg, moving all files to an SSD, building only the linux-bisect package, and passing `MAKEFLAGS=-j8` to really utilitze all the eight cores of my FX-8370. I copied the files from linux-git and renamed it in the PKGBUILD to linux-bisect. I got it down to two commands...

cd ~/linux-bisect/src/linux && git bisect [bad|good|skip]
cd ../.. && time MAKEFLAGS=-j8 makepkg -ei --pkg linux-bisect

I also think I identified the culprit...

5dfc71bc44d91d1620505c064fa22b0b3db58a9d is the first bad commit
commit 5dfc71bc44d91d1620505c064fa22b0b3db58a9d
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Thu Jul 9 21:08:17 2015 -0400

    drm/radeon: add a dpm quirk for Sapphire Radeon R9 270X 2GB GDDR5
    
    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=76490
    
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org

:040000 040000 1534fb2d1b515cfd10436a41c1cffd6e46103815 7f55661cf1fc3b880a37e35fcbed9ca9a55568c5 M	drivers

Last edited by HarlemSquirrel (2015-09-15 13:58:55)

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ozlacs

Member

Registered: 2015-12-31

Posts: 1

Re: AMD R9 270X Flickering with DPM Enabled on Linux 4.1 with RadeonSI

Hi,
I've a Radeon R9 270x, and I've this problem, I used the patch in this until now.
why still no fix with 4.3 kernel?

Lone_Wolf

Member

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,911

Re: AMD R9 270X Flickering with DPM Enabled on Linux 4.1 with RadeonSI

Check https://bugs.freedesktop.org/show_bug.cgi?id=76490

That commit solved a serious problem where some radeon cards didn't give ANY ouput with dpm enabled.

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)