linux-kernel - Re: 4.8-rc1: it is now common that machine needs re-run of xrandr after resume

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Message-ID: <2521657.mCnHBphecV@merkaba>
Date:   Tue, 13 Sep 2016 22:38:45 +0200
From:   Martin Steigerwald <martin@...htvoll.de>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        daniel.vetter@...el.com, jani.nikula@...ux.intel.com,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: 4.8-rc1: it is now common that machine needs re-run of xrandr after resume

Hi.

Am Dienstag, 13. September 2016, 22:23:50 CEST schrieb Pavel Machek: 
> I have
> 
> 00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
> Integrated Graphics Controller (rev 03)

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation 
Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)

Phoronix Test Suite system-info:

System Information

Hardware:
Processor: Intel Core i5-2520M @ 3.20GHz (4 Cores), Motherboard: LENOVO 
42433WG, Chipset: Intel 2nd Generation Core Family DRAM, Memory: 16384MB, 
Disk: 300GB INTEL SSDSA2CW30 + 480GB Crucial_CT480M50, Graphics: Intel 2nd 
Generation Core Family IGP, Audio: Conexant CX20590, Monitor: P24T-7 LED, 
Network: Intel 82579LM Gigabit Connection + Intel Centrino Advanced-N 6205

Software:
OS: Debian unstable, Kernel: 4.8.0-rc6-tp520-btrfstrim+ (x86_64), Desktop: KDE 
Frameworks 5, Display Server: X Server 1.18.4, Display Driver: modesetting 
1.18.4, OpenGL: 3.3 Mesa 12.0.2, Compiler: GCC 6.2.0 20160901, File-System: 
btrfs, Screen Resolution: 3840x1080

> In previous kernels, resume worked ok. With 4.8-rc1, I quite often (1
> in 10 resumes?) get in state where primary monitor (DVI) is dead (in
> powersave) and all windows move to secondary monitor (VGA). Running
> "xrandr" fixes that.

I have seen this in 4.8 up to rc5 as well. I am not sure yet about rc6 which I 
am currently running.

I didn´t run xrandr by hand. But I ran systemsettings, dragged the second, 
deactivated external display back beneath the internal laptop display, 
activated it again and applied this changes. I think this has a somewhat 
similar effect as Plasma uses RANDR as well.
 
> I'll update to newer rc and see if it happens again, but if you have
> any ideas, now would be good time.

No ideas, sorry.

Thanks,
-- 
Martin