Bug#867555: gnome-shell: Tries to drive monitor at unsupported refresh rate

[Mark Brown]

On Fri, Jul 07, 2017 at 12:44:46PM +0100, Simon McVittie wrote:

> My first question is, what graphics hardware and driver is this?

It's this:

05:00.0 VGA compatible controller: Advanced Micro Devices, Inc.  [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series]

using whatever Debian drives it with by default.

> Other things you could try:
> 
> * Run xrandr --verbose (X11 only, not useful in Wayland)

Attached.

> * Move your ~/.config/monitors.xml out of the way (don't delete it; if
>   this works, it would be useful to see what's in it). This is where
>   GNOME stores display settings. You could also compare it with
>   ~/.config/monitors.xml~ which is the second-most-recent version.

Removing my monitors.xml appears to fix things, the difference appears
to be that if I try to make any change to the default layout of the
monitors monitor 1 goes blank.  This has worked for a considerable time.

> * Look for mentions of EDID, DDC or mode in the Xorg log
>   (could be /var/log/Xorg.*.log, ~/.cache/gdm/* or the systemd Journal
>   depending how your X server was started)

I'm using a default Debian system with systemd, I don't know how
specifically the X server is started. The X logs haven't been updated
for a long time.  There's no obvious X logs in .cache/gdm and I've no
idea how to get X logs from systemd.
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Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 8192 x 8192
XWAYLAND0 connected 2560x1440+0+0 (0x26) normal (normal left inverted right x axis y axis) 550mm x 310mm
	Identifier: 0x21
	Timestamp:  8824845
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 0.0
	Clones:    
	CRTC:       0
	CRTCs:      0
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
  2560x1440 (0x26) 312.000MHz -HSync +VSync *current +preferred
        h: width  2560 start 2752 end 3024 total 3488 skew    0 clock  89.45KHz
        v: height 1440 start 1443 end 1448 total 1493           clock  59.91Hz
XWAYLAND1 connected 1280x1024+2560+0 (0x27) normal (normal left inverted right x axis y axis) 380mm x 300mm
	Identifier: 0x23
	Timestamp:  8824845
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 0.0
	Clones:    
	CRTC:       1
	CRTCs:      1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
  1280x1024 (0x27) 109.000MHz -HSync +VSync *current +preferred
        h: width  1280 start 1368 end 1496 total 1712 skew    0 clock  63.67KHz
        v: height 1024 start 1027 end 1034 total 1063           clock  59.89Hz
XWAYLAND2 connected 1280x1024+3840+0 (0x27) normal (normal left inverted right x axis y axis) 340mm x 270mm
	Identifier: 0x25
	Timestamp:  8824845
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 0.0
	Clones:    
	CRTC:       2
	CRTCs:      2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
  1280x1024 (0x27) 109.000MHz -HSync +VSync *current +preferred
        h: width  1280 start 1368 end 1496 total 1712 skew    0 clock  63.67KHz
        v: height 1024 start 1027 end 1034 total 1063           clock  59.89Hz
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