Bug 201183
| Summary: | AMDGPU Dual displays and only DP screen works after grub. | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | marten (marten.b) |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | NEW --- | ||
| Severity: | high | CC: | harry.wentland, nicholas.kazlauskas |
| Priority: | P1 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | 4.18.* | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
kernel 4.18.7 dmesg
Working kernel 4.17 dmesg Kernel 4.18 with drm.debug=6 kernel 4.18 drm.debug=4 Kernel 4.18 drm.debug=6 |
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Created attachment 278655 [details]
Working kernel 4.17 dmesg
For the time being, maybe amdgpu.dc=0 on the kernel command line can serve as a workaround. Thank you Michel. That fixes it. Do you only see this problem occur before you start an X session? It might help if you could post a log from 4.18 with drm.debug=6 included in your boot parameters. Created attachment 278677 [details]
Kernel 4.18 with drm.debug=6
(In reply to Nicholas Kazlauskas from comment #4) > Do you only see this problem occur before you start an X session? > > It might help if you could post a log from 4.18 with drm.debug=6 included in > your boot parameters. Im running Fedora 28 so it wayland. When I remove the quiet from the kernel line the HDMI display works so a few seconds until the GUI for the boot drive encryption displays only on the second display only. I attached the file with drm.debug=6 It doesn't look like your log buffer was large enough to hold the full log. A log with drm.debug=4 might have enough information to work off of. The other option is reposting the drm.debug=6 log with a large log buffer size in the kernel config. Hay the machine can do a large buffer. How do I enable that. I saw it cut off at 30 seconds. Its ryzen 1700, 16G ram and many hd's It should be the CONFIG_LOG_BUF_SHIFT option. For example, CONFIG_LOG_BUF_SHIFT=21. Created attachment 278683 [details]
kernel 4.18 drm.debug=4
Created attachment 278687 [details]
Kernel 4.18 drm.debug=6
(In reply to Nicholas Kazlauskas from comment #9) > It should be the CONFIG_LOG_BUF_SHIFT option. For example, > CONFIG_LOG_BUF_SHIFT=21. Updated the file. |
Created attachment 278653 [details] kernel 4.18.7 dmesg Kernel 4.17 is working but the last 2 versions of 4.18.* will not register my HDMI TV connected to an RX 480. I have a Dell LCD on DP and an LG TV on HDMI. If I unplug the DP display after grub screen the computer will have no display.