Hello,
first of all, I'm new to this list, so please beer with me. On the other
hand, I'm a graduate computer systems engineer with experience in Linux
kernel code, so I can hopefully provide useful input/assistance on this
topic.
I'm replying because I tried your patches on my setup in the hope they'd
fix my lockups. Unfortunately they didn't, so I'm offering debug
assistance to make my system work as well.
Here's my setup:
- Arch Linux
- Lenovo Thinkpad x230 laptop with integrated intel (ivy bridge)
- External GPU (eGPU) connected via ExpressCard <-> PCIe adaptor, a
nvidia GeForce 650 Ti (Kepler). The PCIe link is unfortunately limited
to Gen 1 and one lane.
- PRIME with eGPU as primary (following this guide:
https://wiki.archlinux.org/index.php/PRIME#Discrete_Card_as_Primary_GPU)
- This setup works fine under Windows 10, and the eGPU gives a lot
better performance than the intel chip even with the limited PCIe link.
- I compiled nouveau.ko, and nothing else, from your out-of-tree fork
(branch stable_reclocking_kepler, HEAD at bc4767c (bios/fan: hardcode
the fan mode to linear))
With and without your patches, I get lockups when attempting to reclock
to the highest level (echo 0f > /sys/.../pstate) and then running an
actual game (Dota 2 in this instance). Reclock as such appears to work
fine initially, but the whole system locks up as soon as I start Dota 2.
glxgears runs fine. echo 0a > /sys/.../pstate works as wel, however the
performance is poor.
I suspected that reclocking doesn't work fully in that the core voltage
isn't ramped high enough, so that the GPU (and rest of the system) locks
up when the load goes above some threshold (glxgears works after all).
Unfortunately, I can't see any improvement with your patches.
FWIW, I made sure that the self-compiled nouveau.ko is used by running
make install and then deleting the distro's shipped nouveau.ko. I
verified this by running modprobe -nv nouveau (it also shows that
pstate=1 is correctly passed to it). The nouveau.ko (.ko.gz actually) is
placed under /lib/modules/4.3.3-2-ARCH/extra/nouveau.ko.gz.
Thanks for your ongoing effort to improve the situation on nvidia cards.
I hope I can be of any help.
Best regards.
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