Created attachment 139483 [details] full dmesg The Radeon HD 3450 acceleration support does not work on my computer. uname -a: Linux mouse 4.17.0-041700rc4-generic #201805070430 SMP Mon May 7 04:31:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux In the dmesg I get: [ 4.007419] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD) [ 4.007433] radeon 0000:02:00.0: disabling GPU acceleration
Does it work properly if you remove the nouveau card or switch the slots?
The other video card is integrated into the motherboard, and the disabling the integrated video with bios causes the boot to fail. I could try the video card in a different computer, but that computer would have to be booted from usb since I don't want to change its os. Would a dmesg.txt from a different computer with the same video card with say a 4.15 kernel be useful?
Created attachment 139777 [details] dmesg from different motherboard I tried it on a different computer. I don't get the acceleration error, instead I get errors like: [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID which is odd, since there no HDMI connection on the card.
Phoronix also reported 4870 not to work on 4.17. Could you try some previous kernel version?
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