https://bugs.freedesktop.org/show_bug.cgi?id=73053
--- Comment #6 from Juan Orti <j.orti.alcaine at gmail.com> ---
I have the same problem with a Radeon HD6870 and kernel 3.12.6-300.fc20.x86_64
in Fedora.
I cannot boot with radeon.dpm=1. I see the kernel booting but the monitor goes
black quickly. Sometimes I see the Xorg loading the wallpaper, but suddenly the
image gets corrupted and the monitor goes black.
lspci -v:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barts
XT [Radeon HD 6870] (prog-if 00 [VGA controller])
Subsystem: Hightech Information System Ltd. Device 2010
Flags: bus master, fast devsel, latency 0, IRQ 58
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f7e20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at f7e00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon
/proc/cmdline (without radeon.dpm=1):
BOOT_IMAGE=/root/boot/vmlinuz-3.12.6-300.fc20.x86_64
root=UUID=cd8d5bd5-5d01-4bfc-b417-f766e7ad643b ro rootflags=subvol=root rd.md=0
rd.lvm=0 rd.dm=0 rd.luks=0 vconsole.keymap=es vconsole.font=latarcyrheb-sun16
crashkernel=128M radeon.audio=1 libahci.ignore_sss=1 rhgb quiet
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