Arch Linux

jmcamp

Member

Registered: 2018-01-31

Posts: 2

[solved] X fails to start with linux 4.15.0 in testing

X fails to start when enabling the testing pacman repository in /etc/pacman.conf.

If I switch to linux-lts in testing (i.e. downgrade linux from 4.15.0 to 4.14.16) then X works.

I have a Sandybridge i7-2700K, GIGABYTE RX 460 GV-RX460WF2OC-2GD GPU, and DELL U3011 monitor (2560x1600) connected by dual link DVI.

I use startx to launch X.  /etc/X11/xorg.conf.d is empty.

The error in Xorg.0.log is:
    [     3.451] (EE) modeset(0): failed to set mode: Invalid argument

I compared Xorg.0.log from when I booted with linux  4.14.16 and 4.15.0, and noticed many modelines were detected with 4.14.6 which were not detected with 4.15.0.

4.14.16:

[     5.185] (II) modeset(0): Printing probed modes for output DVI-D-1
[     5.185] (II) modeset(0): Modeline "2560x1600"x60.0  268.50  2560 2608 2640 2720  1600 1603 1609 1646 +hsync -vsync (98.7 kHz eP)
[     5.185] (II) modeset(0): Modeline "2560x1440"x60.0  241.50  2560 2608 2640 2720  1440 1443 1448 1481 +hsync -vsync (88.8 kHz d)
[     5.185] (II) modeset(0): Modeline "2048x1536"x60.0  266.95  2048 2200 2424 2800  1536 1537 1540 1589 -hsync +vsync (95.3 kHz d)
[     5.185] (II) modeset(0): Modeline "1920x1440"x60.0  234.00  1920 2048 2256 2600  1440 1441 1444 1500 -hsync +vsync (90.0 kHz e)
[     5.185] (II) modeset(0): Modeline "1856x1392"x60.0  218.30  1856 1952 2176 2528  1392 1393 1396 1439 -hsync +vsync (86.4 kHz d)
[     5.185] (II) modeset(0): Modeline "1792x1344"x75.0  261.00  1792 1888 2104 2456  1344 1345 1348 1417 -hsync +vsync (106.3 kHz d)
[     5.185] (II) modeset(0): Modeline "1792x1344"x60.0  204.80  1792 1920 2120 2448  1344 1345 1348 1394 -hsync +vsync (83.7 kHz d)
[     5.185] (II) modeset(0): Modeline "2048x1152"x59.9  197.00  2048 2184 2400 2752  1152 1155 1160 1195 -hsync +vsync (71.6 kHz d)
[     5.185] (II) modeset(0): Modeline "2048x1152"x59.9  156.75  2048 2096 2128 2208  1152 1155 1160 1185 +hsync -vsync (71.0 kHz d)
[     5.185] (II) modeset(0): Modeline "1920x1200"x59.9  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync (74.6 kHz d)
[     5.185] (II) modeset(0): Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz e)
[     5.185] (II) modeset(0): Modeline "1920x1080"x60.0  266.50  1920 1944 1960 2000  1080 1081 1084 1111 doublescan +hsync -vsync (133.2 kHz d)

4.15.0:

[     3.331] (II) modeset(0): Printing probed modes for output DVI-D-1
[     3.331] (II) modeset(0): Modeline "1920x1200"x59.9  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync (74.6 kHz d)
[     3.331] (II) modeset(0): Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz e)
[     3.331] (II) modeset(0): Modeline "1920x1080"x60.0  266.50  1920 1944 1960 2000  1080 1081 1084 1111 doublescan +hsync -vsync (133.2 kHz d)
[     3.331] (II) modeset(0): Modeline "1920x1080"x60.0  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync (67.2 kHz d)
[     3.331] (II) modeset(0): Modeline "1920x1080"x59.9  138.50  1920 1968 2000 2080  1080 1083 1088 1111 +hsync -vsync (66.6 kHz d)

The full Xorg.0.log file from linux 4.15.0 is here: https://ptpb.pw/Lft_

Any ideas?

Last edited by jmcamp (2018-02-13 21:07:22)

WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 12,478

Website

Re: [solved] X fails to start with linux 4.15.0 in testing

Mod note: Moving to Testing

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Making lemonade from lemons since 2015.

jmcamp

Member

Registered: 2018-01-31

Posts: 2

Re: [solved] X fails to start with linux 4.15.0 in testing

I built a linux kernel using drm-next-4.17-wip, and X now starts without issues.