Public bug reported:
[1]
Using the default "radeon" driver result in black screen on boot. Waiting until
what looks like X finish initializing, putting the computer to sleep and awake
it again almost always works as a workaround.
dmesg:
[ 5.165441] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5
tries
[ 5.165453] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed
And it looks like the DisplayPort is not initialized correctly.
"Black screen" in this context means nothing works (no TTY:s).
[2]
Disabling si_support (GCN 1.0) in grub results in system always boot correct
from a shutdown state but awake from sleep doesn't work.
[3]
Switching to the experimental (for GCN 1.0 cards) amdgpu driver result in the
same behavior as in [2].
[xrandr]
DisplayPort-1 connected primary 2560x1440+0+0 (normal left inverted right x
axis y axis) 597mm x 336mm
2560x1440 59.95*+
1280x720 59.86
[lshw -c display]
*-display
description: VGA compatible controller
product: Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:57 memory:c0000000-cfffffff memory:fbe00000-fbe3ffff
ioport:e000(size=256) memory:c0000-dffff
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: 4.15.0-36-generic amdgpu radeon
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https://bugs.launchpad.net/bugs/1796574
Title:
Black screen on boot with AMD Radeon HD 7970/8970 OEM / R9 280X
Status in linux package in Ubuntu:
Incomplete
Bug description:
[1]
Using the default "radeon" driver result in black screen on boot. Waiting
until what looks like X finish initializing, putting the computer to sleep and
awake it again almost always works as a workaround.
dmesg:
[ 5.165441] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed:
5 tries
[ 5.165453] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed
And it looks like the DisplayPort is not initialized correctly.
"Black screen" in this context means nothing works (no TTY:s).
[2]
Disabling si_support (GCN 1.0) in grub results in system always boot correct
from a shutdown state but awake from sleep doesn't work.
[3]
Switching to the experimental (for GCN 1.0 cards) amdgpu driver result in the
same behavior as in [2].
[xrandr]
DisplayPort-1 connected primary 2560x1440+0+0 (normal left inverted right x
axis y axis) 597mm x 336mm
2560x1440 59.95*+
1280x720 59.86
[lshw -c display]
*-display
description: VGA compatible controller
product: Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:57 memory:c0000000-cfffffff memory:fbe00000-fbe3ffff
ioport:e000(size=256) memory:c0000-dffff
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