Bug 112921

Summary:	[radeon] Lock-up after screensaver
Product:	Drivers	Reporter:	Jean Delvare (jdelvare)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	alexdeucher
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	4.4	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	dmesg output Xorg.0.log

Description Jean Delvare 2016-02-23 09:23:36 UTC

Since I updated my kernel to v4.4, my system freezes frequently when I wake it up from screen-off state (no suspend/resume involved, only screensaver kicking in and display going to sleep.)

With previous kernels (<= 4.3.6) the lock-up never happened, although I sometimes had garbled colors after screensaver, which could be solved easily by switching to text console then back to X. The same workaround doesn't work for the lock-up.

I'm running Gnome 3.16.0 on openSUSE Leap 42.1. The hardware is:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670]

I am able to unlock X by restarting gnome-shell (with "killall -3 gnome-shell" from a text console.)

Comment 1 Jean Delvare 2016-02-23 09:25:22 UTC

I compared the boot messages from kernels v4.3.5 and v4.4.2. The only difference is the following error in v4.3.5 which is no longer present in v4.4.2:

[drm:btc_dpm_set_power_state [radeon]] *ERROR* rv770_set_sw_state failed

I have no idea if this is related.

Comment 2 Jean Delvare 2016-02-23 09:28:45 UTC

Created attachment 204371 [details]
dmesg output

Comment 3 Jean Delvare 2016-02-23 09:30:41 UTC

Created attachment 204381 [details]
Xorg.0.log

Comment 4 Alex Deucher 2016-02-23 15:19:20 UTC

This looks like the vblank regression bug.  See this thread for more info:
https://lists.freedesktop.org/archives/dri-devel/2016-January/098823.html
and the fdo bug:
https://bugs.freedesktop.org/show_bug.cgi?id=93746

Comment 5 Jean Delvare 2016-02-25 07:22:48 UTC

Thanks for the pointer Alex, I'll test Mario's patch right now.

Comment 6 Jean Delvare 2016-02-27 12:09:57 UTC

Unfortunately, Mario's patch does not fix my problem.

Comment 7 Michel Dänzer 2016-02-29 01:20:36 UTC

Which patch did you try? Mario actually came up with a number of separate fixes to address this regression. I think all of them should be in Linus' tree by now (for 4.5).

Comment 8 Jean Delvare 2016-03-06 08:08:15 UTC

I used the patch attached in bugzilla comment https://bugs.freedesktop.org/show_bug.cgi?id=93746#c18 on top of v4.4.3. This is the same patch that went upstream.

I'll test v4.4.4 next, as I see many radeon fixes went into this version.

Comment 9 Jean Delvare 2016-03-09 11:24:46 UTC

I've been running v4.4.4 for some time now and the lock-up never happened. So I guess it's fixed there, thanks.