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<font face="Open Sans, Calibri, sans-serif">I have a 21:9 ultrawide
monitor connected to an RX 570 with the amdgpu driver. I'm still
using the 4.14 kernel since with later kernels I can't get the
driver to allow use of the full resolution of 2560x1080 and I'm
limited to regular HD, ie 1920x1080. The latest kernel I've tried
is 5.4-rc2. My distro is NixOS unstable-small. I have two other
monitors (16:9 and 16:10) connected to the same graphics card.<br>
<br>
Is there anything I can do to work around this or try to fix it? I
had a look at the driver sources but couldn't find where the mode
is set. I'm happy to try things if someone can point me in the
right direction, even if it's just to gather better info for a bug
report. Using such an old kernel is becoming really inconvenient.<br>
<br>
Some additional info about the situation on 4.14 that may or may
not help:<br>
<br>
1. The resolution is limited with Wayland but not with X11<br>
<br>
2. When the system boots up the resolution is square and the image
is squished horizontally with many columns dropped, both during
the boot process and at the gdm login screen. It's not until after
I log with X11 that the resolution is set correctly.<br>
<br>
3. The output of xrandr --props is below.<br>
<br>
TIA for any help.<br>
<br>
--Neil<br>
<br>
Screen 0: minimum 320 x 200, current 6160 x 1080, maximum 16384 x
16384<br>
DP-1 connected primary 2560x1080+1920+0 (normal left inverted
right x axis y axis) 798mm x 334mm<br>
_MUTTER_PRESENTATION_OUTPUT: 0 <br>
EDID: <br>
00ffffffffffff001e6df9765de80500<br>
091c010380502278eaca95a6554ea126<br>
0f5054256b807140818081c0a9c0b300<br>
d1c08100d1cfcd4600a0a0381f403020<br>
3a001e4e3100001a003a801871382d40<br>
582c4500132a2100001e000000fd0038<br>
4b1e5a18000a202020202020000000fc<br>
004c4720554c545241574944450a01b5<br>
02031af12309070747100403011f1312<br>
8301000065030c0010008c0ad08a20e0<br>
2d10103e96001e4e31000018295900a0<br>
a038274030203a001e4e3100001a0000<br>
00000000000000000000000000000000<br>
00000000000000000000000000000000<br>
0000000000ff003830394e544b464244<br>
3136350a0000000000000000000000a4<br>
dither: off <br>
supported: off, on<br>
audio: auto <br>
supported: off, on, auto<br>
scaling mode: None <br>
supported: None, Full, Center, Full aspect<br>
underscan vborder: 0 <br>
range: (0, 128)<br>
underscan hborder: 0 <br>
range: (0, 128)<br>
underscan: off <br>
supported: off, on, auto<br>
coherent: 1 <br>
range: (0, 1)<br>
link-status: Good <br>
supported: Good, Bad<br>
CONNECTOR_ID: 48 <br>
supported: 48<br>
non-desktop: 0 <br>
supported: 0, 1<br>
2560x1080 59.98 + 74.99* <br>
1920x1080 74.99 59.96 50.00 59.99 59.94
59.93 <br>
1680x1050 59.95 59.88 <br>
<br>
[etc.]<br>
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