[Bug 108997] RX460: Some Resolution-Refresh Combinations Unavailable when Connected via DisplayPort
https://bugs.freedesktop.org/show_bug.cgi?id=108997
Bug ID: 108997 Summary: RX460: Some Resolution-Refresh Combinations Unavailable when Connected via DisplayPort Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: jeffbai@aosc.io
- Xorg Server version: 1.20.3 - XRandR version: 1.5.0 - Xf86-Video-AMDGPU version: 18.0.1 - Kernel parameters: root=UUID=dfd3d587-145e-4c01-af04-a3e24c59e95c rw quiet rw rd.auto rd.auto=1 splash vfio-pci.ids=10de:1c03,1022:145f,1022:1457 modprobe.blacklist=nouveau iommu=pt amd_iommu=on kvm-amd.avic=1 kvm-amd.nested=1 clocksource=tsc kvm.ignore_msrs=1 pcie_acs_override=multifunction rd.driver.pre=vfio-pci video=efifb:off
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Xorg.conf:
Section "Device" Identifier "Device 0" Driver "amdgpu" VendorName "Advanced Micro Devices, Inc." BusID "PCI:34:0:0" Option "IgnoreEDID" "true" Option "UseEDID" "false" EndSection
Section "Monitor" Identifier "Monitor 0" VendorName "SAMSUNG" ModelName "900SL" Option "UseEDID" "false" Option "UseEDIDFreqs" "false" Option "DDC" "false" HorizSync 30.0 - 96.0 VertRefresh 50.0 - 100.0 Modeline "1600x1200_76.00" 207.50 1600 1720 1888 2176 1200 1203 1207 1256 -hsync +vsync Option "PreferredMode" "1600x1200_76.00" EndSection
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While connecting my XFX Radeon RX460 Slim to a Samsung 900SL CRT monitor via a DisplayPort to VGA converter cable, 1600x1200@76Hz is not available, despite the factory specs...
1600 x 1200 / 76 Hz 1600 x 1200 / 70 Hz 1600 x 1200 / 65 Hz 1280 x 1024 / 89 Hz 1024 x 768 / 119 Hz 800 x 600 / 152 Hz 640 x 480 / 160 Hz
When attempting to create a new custom mode...
mingcongbai@NetVista [ / ] $ cvt 1600 1200 76 # 1600x1200 75.92 Hz (CVT) hsync: 95.36 kHz; pclk: 207.50 MHz Modeline "1600x1200_76.00" 207.50 1600 1720 1888 2176 1200 1203 1207 1256 -hsync +vsync
mingcongbai@NetVista [ / ] $ xrandr --newmode "1600x1200_76.00" 207.50 1600 1720 1888 2176 1200 1203 1207 1256 -hsync +vsync
mingcongbai@NetVista [ / ] $ xrandr --addmode DisplayPort-0 "1600x1200_76.00"
mingcongbai@NetVista [ / ] $ xrandr --output DisplayPort-0 --mode "1600x1200_76.00" xrandr: Configure crtc 0 failed
I have an NVIDIA GeForce GTX1060 passed through to a Windows 10 VM, connected via a DisplayPort to VGA, and VGA to BNC 5-pin connector, in this case, 1600x1200 is available and displays a correct image.
I have also tried to connect the RX460 with the DP-VGA-BNC cable, which yielded the same result.
https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #1 from Mingcong Bai jeffbai@aosc.io --- I'm able to get the full 1600x1200@76Hz image with an active HDMI to VGA adapter. The image is a bit ghosted, but it's probably just the converter.
https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #2 from Mingcong Bai jeffbai@aosc.io --- Created attachment 142766 --> https://bugs.freedesktop.org/attachment.cgi?id=142766&action=edit EDID Dump (from Xorg.0.log)
https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #3 from Mingcong Bai jeffbai@aosc.io --- The EDID data (obtained from Xorg.0.log output and attached above) also suggests that such mode is possible (unless I misunderstood something).
mingcongbai@NetVista [ / ] $ cat edid.bin | edid-decode EDID version: 1.2 Manufacturer: SAM Model 4db9 Serial Number 1346842937 Analog display, Input voltage level: 0.7/0.3 V Sync: Separate Composite SyncOnGreen Serration Maximum image size: 36 cm x 27 cm Gamma: 2.28 DPMS levels: Standby Suspend Off RGB color display First detailed timing is preferred timing Supports GTF timings within operating range Display x,y Chromaticity: Red: 0.6376, 0.3251 Green: 0.2763, 0.5957 Blue: 0.1425, 0.0664 White: 0.2832, 0.2978 Established timings supported: 720x400@70Hz 9:5 HorFreq: 31469 Hz Clock: 28.320 MHz 720x400@88Hz 9:5 HorFreq: 39500 Hz Clock: 35.500 MHz 640x480@60Hz 4:3 HorFreq: 31469 Hz Clock: 25.175 MHz 640x480@67Hz 4:3 HorFreq: 35000 Hz Clock: 30.240 MHz 640x480@72Hz 4:3 HorFreq: 37900 Hz Clock: 31.500 MHz 640x480@75Hz 4:3 HorFreq: 37500 Hz Clock: 31.500 MHz 800x600@56Hz 4:3 HorFreq: 35200 Hz Clock: 36.000 MHz 800x600@60Hz 4:3 HorFreq: 37900 Hz Clock: 40.000 MHz 800x600@72Hz 4:3 HorFreq: 48100 Hz Clock: 50.000 MHz 800x600@75Hz 4:3 HorFreq: 46900 Hz Clock: 49.500 MHz 832x624@75Hz 4:3 HorFreq: 49726 Hz Clock: 57.284 MHz 1280x768i@87Hz 5:3 HorFreq: 35522 Hz Clock: 44.900 MHz 1024x768@60Hz 4:3 HorFreq: 48400 Hz Clock: 65.000 MHz 1024x768@70Hz 4:3 HorFreq: 56500 Hz Clock: 75.000 MHz 1024x768@75Hz 4:3 HorFreq: 60000 Hz Clock: 78.750 MHz 1280x1024@75Hz 5:4 HorFreq: 80000 Hz Clock: 135.000 MHz 1152x870@75Hz 192:145 HorFreq: 67500 Hz Clock: 108.000 MHz Standard timings supported: 640x480@85Hz 4:3 HorFreq: 43300 Hz Clock: 36.000 MHz 800x600@85Hz 4:3 HorFreq: 53700 Hz Clock: 56.250 MHz 1024x768@85Hz 4:3 HorFreq: 68700 Hz Clock: 94.500 MHz 1280x1024@85Hz 5:4 HorFreq: 91100 Hz Clock: 157.500 MHz 1600x1200@75Hz 4:3 HorFreq: 93800 Hz Clock: 202.500 MHz 1024x768@100Hz 4:3 Detailed mode: Clock 157.500 MHz, 352 mm x 264 mm 1280 1344 1504 1728 hborder 0 1024 1025 1028 1072 vborder 0 +hsync +vsync VertFreq: 85 Hz, HorFreq: 91145 Hz Monitor ranges (GTF): 50-160Hz V, 30-96kHz H, max dotclock 210MHz Monitor name: S/M 900SL Serial number: H3NN105750 Checksum: 0xe0 (valid)
https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #4 from Mingcong Bai jeffbai@aosc.io --- Using the same cable, the NVIDIA GeForce GTX1060 using proprietary driver version 410.66 is able to drive 1600x1200@76Hz with no issue.
https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #5 from Mingcong Bai jeffbai@aosc.io --- Created attachment 142767 --> https://bugs.freedesktop.org/attachment.cgi?id=142767&action=edit Kernel Configuration - 4.19.0
https://bugs.freedesktop.org/show_bug.cgi?id=108997
Martin Peres martin.peres@free.fr changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |MOVED Status|NEW |RESOLVED
--- Comment #6 from Martin Peres martin.peres@free.fr --- -- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/639.
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