inexplicable fallback mode used when preferred mode 2560x1080 not supported by connection

[Felix Miata]

Adam Jackson composed on 2017-02-13 11:27 (UTC-0500):

> On Sun, 2017-02-12 at 05:10 -0500, Felix Miata wrote:

>> http://fm.no-ip.com/Tmp/Linux/Xorg/xorg.0.log-big31-ostw-d2913wm.txt is
>> Xorg.0.log plus output from inxi -c0 -G, hwinfo --gfxcard and xrandr from a
>> GT210[1] on host big31 booted to openSUSE Tumbleweed and modesetting driver,
>> which falls to 1400x1050 using an HDMI cable. Using instead nouveau, fall is to
>> 1152x864, same as same PC booted to openSUSE 42.1 using HDMI and modesetting
>> driver, and same PC booted to Fedora 25 using HDMI and nouveau driver.

> Can you add Option "ModeDebug" "true" to your Device section in
> xorg.conf and give the log from that?

<http://fm.no-ip.com/Tmp/Linux/Xorg/xorg.0.log-big31-ostw-d2913wm-ajax01-modedebugtrue>

http://fm.no-ip.com/Tmp/Linux/Xorg/get-edid-big41-d2913wm-hdmi-deb9.txt is the 
output from 'get-edid | parse-edid' running TDE on Sid fallen back to 1152x864 
mode using modesetting driver and HDMI on Intel gfx host big41, where mode 
details for 0 and 17 are conspicuously absent.

http://fm.no-ip.com/Tmp/Linux/Xorg/get-edid-big41-d2913wm-vga-deb9.txt is the 
output from 'get-edid | parse-edid' running TDE on Sid running native mode 
2560x1080 using modesetting driver and VGA on Intel gfx host big41, where 
extension block is conspicuously absent, and output sharpness is very poor 
compared to same display running 2560x1080 via either DVI or DisplayPort inputs.
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