On Tue, Aug 30, 2016 at 11:44 AM, Ilia Mirkin <imirkin@xxxxxxxxxxxx> wrote: > On Tue, Aug 30, 2016 at 11:25 AM, Roland Singer > <roland.singer@xxxxxxxxxxxxx> wrote: >> I tried these scenarios: >> >> 1. Booted the system without the bbswitch module. The nouveau module >> was loaded and is responsible for the power management of the GPU. >> The graphical session freezes after some minutes... >> >> 2. Booted the system without bbswitch and with nouveau blacklisted. >> Manually loaded bbswitch to switch off the discrete GPU. >> Same freeze after a while or by explicitly obtaining the GPU state. >> >> Is there a possibility to switch off the discrete card without bbswitch? >> If this is possible, then I could test this without nouveau and bbswitch >> at all. If the system hangs, then it is not the video driver nor bbswitch. > > You can use acpi_call (a random search points to > https://github.com/mkottman/acpi_call, but I don't know if that's the > "official" version) - need to find the right method to call, but > that's basically all it takes to acpi-suspend a gpu. > > Separately, there was a recent fix to ... something, including but not > limited to nouveau, involving hangs on gpu suspend on newer laptops. I > don't think it's upstream yet. Look for patches from Lukas Wunner. Er oops. Looks like I misremembered. Patches are from Peter Wu, and at least one of them is in v4.8-rc1: commit 692a17dcc2922a91c6bcf11b3321503a3377b1b1 Author: Peter Wu <peter@xxxxxxxxxxxxx> Date: Fri Jul 15 15:12:18 2016 +0200 drm/nouveau/acpi: fix lockup with PCIe runtime PM along with a number of other related patches. It's not clear which kernel you were trying this with... can you give v4.8-rcN a shot? -ilia -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
