| Bug ID | 107668 |
|---|---|
| Summary | Blank screen since Kernel 4.17 (AMDGPU.DC) on Amd Radeon RX460 and RX380 on HDMI Ultrawidescreen Monitor |
| Product | DRI |
| Version | XOrg git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | naheemzaffar@gmail.com |
Created attachment 141265 [details] Dmesg from boot with Kernel 4.19 prerelease I have already reported this on Redhat Bugzilla, so if more information is needed, that may be a good place to look at comments: https://bugzilla.redhat.com/show_bug.cgi?id=1594488 Since the change to using dc in the kernel I am getting a blank screen with trying to boot my ultrawidescreen monitor. As a workaround I can use amdgpu.dc=0, but this hits al earlier big where at native resolution the display output is garbled (links in Redhat Bugzilla attach to another big report, youtube video of the same). I am attaching dmesg output from 4.19.0-0.rc0.git8.1.vanilla.knurd.1.fc28.x86_64 with and without amdgpu.dc=0 I have noticed a couple of entries in the dmesg without the amdgpu.dc=0: kernel: [drm] add ip block number 4 <dm> with amdgpu.dc=0 it is: kernel: [drm] add ip block number 4 <dce_v11_0> The other ip address block entries are identical. with amdgpu.dc=0 I get this section: Aug 22 23:46:22 kernel: [drm] PCIE GART of 256M enabled (table at 0x000000F400900000). Aug 22 23:46:22 kernel: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). Aug 22 23:46:22 kernel: [drm] Driver supports precise vblank timestamp query. Aug 22 23:46:22 kernel: [drm] AMDGPU Display Connectors Aug 22 23:46:22 kernel: [drm] Connector 0: Aug 22 23:46:22 kernel: [drm] DP-1 Aug 22 23:46:22 kernel: [drm] HPD5 Aug 22 23:46:22 kernel: [drm] DDC: 0x4868 0x4868 0x4869 0x4869 0x486a 0x486a 0x486b 0x486b Aug 22 23:46:22 kernel: [drm] Encoders: Aug 22 23:46:22 kernel: [drm] DFP1: INTERNAL_UNIPHY1 Aug 22 23:46:22 kernel: [drm] Connector 1: Aug 22 23:46:22 kernel: [drm] HDMI-A-1 Aug 22 23:46:22 kernel: [drm] HPD3 Aug 22 23:46:22 kernel: [drm] DDC: 0x4874 0x4874 0x4875 0x4875 0x4876 0x4876 0x4877 0x4877 Aug 22 23:46:22 kernel: [drm] Encoders: Aug 22 23:46:22 kernel: [drm] DFP2: INTERNAL_UNIPHY1 Aug 22 23:46:22 kernel: [drm] Connector 2: Aug 22 23:46:22 kernel: [drm] DVI-D-1 Aug 22 23:46:22 kernel: [drm] HPD4 Aug 22 23:46:22 kernel: [drm] DDC: 0x4878 0x4878 0x4879 0x4879 0x487a 0x487a 0x487b 0x487b Aug 22 23:46:22 kernel: [drm] Encoders: Aug 22 23:46:22 kernel: [drm] DFP3: INTERNAL_UNIPHY Aug 22 23:46:22 kernel: [drm] Chained IB support enabled! but without amdgpu.dc=0 only the first and last line of that section appear. Later down without the amdgpu.dc=0 I also get the following message: kernel: [drm] Cannot find any crtc or sizes This may also be similar to bug https://bugs.freedesktop.org/show_bug.cgi?id=105880 but that is for laptop panels on LVDS while this issue is with a discrete RX460 graphics card on HDMI
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