[Bug 82201] [HAWAII] GPU doesn't reclock, poor 3D performance

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=82201

--- Comment #40 from Kai <kai@dev.carbon-project.org> ---
(In reply to Sebastian Parborg from comment #38)
> However I do not have windows installed at all. So I think we can rule that
> one out.
> 
> For me it seem like the card loses the ability to reclock after a while.
> However I have regained the reclocking ability by rebooting to use fgrlx and
> then reboot back to use radeon...
> 
> I'm just as confused as you are why it stops working. :S

(In reply to Sebastian Parborg from comment #39)
> I take the fglrx stuff back. Seems like I were lucky the times that it
> worked...

Sounds right. It has been so annoying to not be able to come up with at least
one 100 % case. For me the non-reclocking GPU happens relatively reliable after
coming off a Windows boot or after installing a new initrd (preferably for a
new kernel, but regular updates can trigger it as well). Then the most
"reliable" way to get back a reclocking GPU is:
- execute: echo 1 > /sys/bus/pci/devices/<pci bus id>/rom && cat
/sys/bus/pci/devices/<pci bus id>/rom > /tmp/vbios.dump && echo 0 >
/sys/bus/pci/devices/<pci bus id>/rom
- reboot and when I'm prompted for the BIOS/UEFI password, which I've set for
system boots, press the power button for a few seconds until the system powers
off.
- boot normally
- in case the GPU doesn't reclock yet: repeat

This is so esoteric and sounds completely arbitrary. I have no clue what stars
need to align to get a reclocking GPU. If I have one, the performance is good
in various games.
Also, on every boot I'm seeing a line "radeon 0000:01:00.0: Invalid ROM
contents":

[   18.843246] [drm] initializing kernel modesetting (HAWAII 0x1002:0x67B1
0x1682:0x9295).
[   18.843260] [drm] register mmio base: 0xF7E00000
[   18.843261] [drm] register mmio size: 262144
[   18.843267] [drm] doorbell mmio base: 0xF0000000
[   18.843269] [drm] doorbell mmio size: 8388608
[   18.843293] radeon 0000:01:00.0: Invalid ROM contents
[   18.843351] ATOM BIOS: C67111
[   18.843405] radeon 0000:01:00.0: VRAM: 4096M 0x0000000000000000 -
0x00000000FFFFFFFF (4096M used)
[   18.843408] radeon 0000:01:00.0: GTT: 1024M 0x0000000100000000 -
0x000000013FFFFFFF
[   18.843410] [drm] Detected VRAM RAM=4096M, BAR=256M
[   18.843411] [drm] RAM width 512bits DDR
[   18.843475] [TTM] Zone  kernel: Available graphics memory: 8215252 kiB
[   18.843477] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[   18.843479] [TTM] Initializing pool allocator
[   18.843485] [TTM] Initializing DMA pool allocator
[   18.843508] [drm] radeon: 4096M of VRAM memory ready
[   18.843510] [drm] radeon: 1024M of GTT memory ready.
[   18.843526] [drm] Loading hawaii Microcode
[   19.238535] [drm] Internal thermal controller with fan control
[   19.238598] [drm] probing gen 2 caps for device 8086:151 = 261ad03/e

But since that happens with and without a reclocking GPU, it's probably
unrelated.

For me, the problem has become less often to occur with recent kernels (3.17.0
and currently 3.18-rc1), but it still happens.

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