https://bugzilla.kernel.org/show_bug.cgi?id=199797 Bug ID: 199797 Summary: Low resolution on monitor reconnect with amdgpu and Dell P2715Q Product: Drivers Version: 2.5 Kernel Version: 4.16.10 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx Reporter: joh@xxxxxxxxxxxxxxxxx Regression: No Created attachment 276131 --> https://bugzilla.kernel.org/attachment.cgi?id=276131&action=edit Verbose drm log (echo 0xff > /sys/module/drm/parameters/debug) When I unplug and plug in my Dell P2715Q monitor, the resolution is wrong. I get 800x600@75Hz instead of the native resolution (3840x2160@60Hz). Sometimes I'm able to switch to the native resolution with xrandr, other times xrandr reports that it cannot find the mode. In that case it helps to turn the monitor off and on, after which the mode is available to xrandr (EDID issue?). dmesg reports the following error: [drm:dm_restore_drm_connector_state [amdgpu]] *ERROR* Restoring old state failed with -22 I use a kvm switch with the monitor, so the monitor is reconnected quite often. I've eliminated the kvm switch as the source of the problem by plugging the monitor directly into the GPU (an AMD RX560), and replugging the displayport cable. I've tried dumping the EDID to /lib/firmware and booting with drm.edid_firmware=edid/DELL-P2715Q.bin, but this doesn't seem to help. Verbose drm log attached. -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
