Re: [3.16-rcX][pciehp][radeon] PCIe HotPlug conflicts with radeon GPU

[Bjorn Helgaas]

[+cc linux-pci]

On Sat, Aug 2, 2014 at 10:02 AM, Shawn Starr <shawn.starr@xxxxxxxxxx> wrote:
> Hello devs,
>
> There are two issues I am encountering with the PCIe Hotplug driver on my Lenovo Laptop (W500). I note this goes back further than 3.15.
>
> It is noted here:
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f244d8b623dae7a7bc695b0336f67729b95a9736
> https://bugzilla.kernel.org/show_bug.cgi?id=79701
>
> And my open bug here:
> https://bugzilla.kernel.org/show_bug.cgi?id=77261
>
> 1) If I enable the device to use both the integrated and discrete GPU, pciehp will decide to force unload radeon because it puts itself into a power saving state, fails back to the Intel integrated GPU in this case unless I tell radeon.ko to runpm=0 (no power management, then pciehp wont touch it).
>
> 2) If the Radeon GPU resets and you use pci_reset=1 for kernel module option, pciehp decides to force unload radeon even though the GPU is trying to setup after failing.
>
> Kernel I am using right now: 3.16.0-0.rc7.git3.1.fc21.x86_64 (about to boot into snapshot kernel-core-3.16.0-0.rc7.git4.1.fc21.x86_64)

Hi Shawn,

Thanks for the report and sorry that it got dropped.  But I see you're
cc'd on https://bugzilla.kernel.org/show_bug.cgi?id=79701, so you've
probably seen the work there.  If you can try out the patches I just
posted, that would be great.

Bjorn
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