Thanks this kernel version can boot the system, but the performance of the UI have a problem. Everything lags and also with youtube video's there are a lot of frame drops.
dmesg | grep -i radeon [ 1.371941] [drm] radeon kernel modesetting enabled. [ 1.514874] fb: switching to radeondrmfb from EFI VGA [ 1.573397] radeon 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=none [ 1.809709] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used) [ 1.809713] radeon 0000:01:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF [ 1.809815] [drm] radeon: 1024M of VRAM memory ready [ 1.809817] [drm] radeon: 1024M of GTT memory ready. [ 1.814783] [drm] radeon: dpm initialized [ 1.815311] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0 [ 1.826451] radeon 0000:01:00.0: WB enabled [ 1.826455] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0x00000000957e19e9 [ 1.826458] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0x00000000178c14b1 [ 1.827205] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0x000000005541d674 [ 1.827212] radeon 0000:01:00.0: radeon: MSI limited to 32-bit [ 1.827245] radeon 0000:01:00.0: radeon: using MSI. [ 1.827275] [drm] radeon: irq initialized. [ 3.011583] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 4.023636] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 5.035688] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 6.047740] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 7.059790] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 8.071841] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 9.083890] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 10.095939] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 11.107990] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 12.120038] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!! [ 12.139899] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, giving up!!! [ 12.139907] radeon 0000:01:00.0: failed initializing UVD (-1). [ 13.148133] [drm:r600_ib_test [radeon]] *ERROR* radeon: fence wait timed out. [ 13.148179] [drm:radeon_ib_ring_tests [radeon]] *ERROR* radeon: failed testing IB on GFX ring (-110). [ 13.148197] [drm:radeon_device_init [radeon]] *ERROR* ib ring test failed (-110). [ 13.208032] [drm] radeon atom DIG backlight initialized [ 13.208041] [drm] Radeon Display Connectors [ 14.405759] fbcon: radeondrmfb (fb0) is primary device [ 16.430012] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device [ 16.444306] [drm] Initialized radeon 2.50.0 20080528 for 0000:01:00.0 on minor 1 [ 180.804054] radeon_dp_aux_transfer_native: 326 callbacks suppressed [ 193.072054] radeon_dp_aux_transfer_native: 326 callbacks suppressed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1743427 Title: Black screen with iMac 2011 and ATI Radeon 6970M Status in linux package in Ubuntu: Incomplete Bug description: Dear community! I have installed Ubuntu 17.10 (also tried 17.04 and 16.04), and the system gets a black screen on boot with all tested Ubuntu versions. Also ping and ssh to the host does not work. The fan's are running, the screen is black and nothing more. When i insert in Grub nomodeset, the system can boot. I have also tested Kernel 4.14 and 4.15RC7. Hardware Information: 00:02.0 Display controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M] Thanks for help or any hint. Best regards, Hans --- ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: christian 1756 F.... pulseaudio /dev/snd/controlC1: christian 1756 F.... pulseaudio DistroRelease: Ubuntu 17.10 HibernationDevice: RESUME=/dev/mapper/storage-swap InstallationDate: Installed on 2018-01-15 (0 days ago) InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64 (20180108.1) MachineType: Apple Inc. iMac12,2 Package: linux (not installed) ProcEnviron: LANGUAGE= TERM=xterm-256color PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-25-generic.efi.signed root=/dev/mapper/storage-root ro rootflags=subvol=@ nomodeset ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.13.0-25-generic N/A linux-backports-modules-4.13.0-25-generic N/A linux-firmware 1.169.1 Tags: artful Uname: Linux 4.13.0-25-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 08/08/17 dmi.bios.vendor: Apple Inc. dmi.bios.version: IM121.88Z.004D.B00.1708080012 dmi.board.name: Mac-942B59F58194171B dmi.board.vendor: Apple Inc. dmi.board.version: iMac12,2 dmi.chassis.type: 13 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-942B59F58194171B dmi.modalias: dmi:bvnAppleInc.:bvrIM121.88Z.004D.B00.1708080012:bd08/08/17:svnAppleInc.:pniMac12,2:pvr1.0:rvnAppleInc.:rnMac-942B59F58194171B:rvriMac12,2:cvnAppleInc.:ct13:cvrMac-942B59F58194171B: dmi.product.family: iMac dmi.product.name: iMac12,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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