Black screen with iMac 2011 and ATI Radeon 6970M

[Hans Matros]

Using Ubuntu 16.04 through 17.10, when I boot the screen is black, ping and ssh to the host does not work, and the fan is running. Same problem with kernel 4.14 and 4.15RC7.

WORKAROUND: Use kernel parameter:
nomodeset

---
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.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1743427

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Hans Matros (hansmatros)]

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[Kai-Heng Feng (kaihengfeng)]

Please try this kernel, http://people.canonical.com/~khfeng/lp1743427/

[Hans Matros (hansmatros)]

Dear Kai-Heng Feng!

Thanks for your response. I have tried your kernel version, but it is the same bug with the black screen.

Best regards,

Hans

[Kai-Heng Feng (kaihengfeng)]

Can you test the mainline kernel?
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc8

[Hans Matros (hansmatros)]

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] ...

[Kai-Heng Feng (kaihengfeng)]

Please file an upstream bug at https://bugs.freedesktop.org/
Product: DRI
Component: DRM/radeon

[Hans Matros (hansmatros)]

Thanks for your support. I have created an upstream bug report:

https://bugs.freedesktop.org/show_bug.cgi?id=104738

[penalvch (penalvch)]

Hans Matros, to see if this is resolved upstream, could you use the latest kernel 4.15.1 without the WORKAROUND?

If it has boot issues, please provide details via https://wiki.ubuntu.com/DebuggingKernelBoot .

Also, when providing dmesg, please don't grep/cut/snip logs. Post them in full.

[Langdon Staab (langdonstaab)]

I have twice installed Linux Mint on an 2011 iMac. It is 21.5 inch with AMD Radeon HD 6750M 512 MB graphics and 2.5 GHz Intel Core i5.

Every time I install Linux Mint, it boots correctly a couple times but then simply displays a totally blank screen when booted up.

Once this happens, the system will not boot correctly again.
Ubuntu works fine, why is Linux Mint broken?