Bug 205987
| Summary: | Monitor Modeline missing for ACER XB240H | ||
|---|---|---|---|
| Product: | Other | Reporter: | chriskoch |
| Component: | Configuration | Assignee: | other_configuration (other_configuration) |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | ||
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | All Versions >4.15 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
*** This bug has been marked as a duplicate of bug 201497 *** |
Steps to reproduce: When using kernels >4.15 the system is booting into 640x480@60hz xrandr shows no other available modelines. Actual Results: Linux can be used, but the resolution cannot be switched. Expected Results: The system should boot into the native resolution of the monitor which is 1920x1080. When executing xrandr all possible modelines should be present. I think there is a communication error. The DisplayPort cannot read the EDID. Hardware: AMD Vega 56 GPU ACER XB240H 1080x1920@144hz connected via DisplayPort i5-6600K Additional Information on how to temporarily fix it - add modeline manually: I booted into a Kernel 4.15 and looked up the current working modeline for my monitor in /var/log/Xorg.0.log then I executed following commands: xrandr --newmode "1920x1080X" 325.08 1920 1944 1976 2056 1080 1083 1088 1098 +hsync +vsync xrandr --addmode DisplayPort-0 1920x1080X (xrandr --output DisplayPort-0 --mode 1920x1080X) and the right resolution shows up. How to boot automatically into the new modeline? I created /usr/share/X11/xorg.conf.d/10-monitor.conf with following content: Section "Monitor" Identifier "DisplayPort-0" Modeline "1920x1080X" 325.08 1920 1944 1976 2056 1080 1083 1088 1098 +hsync +vsync Option "PreferredMode" "1920x1080X" EndSection reboot