Control: forwarded -1 https://lore.kernel.org/r/20200506144558.GA4019@taurus.defre.kleine-koenig.org Hello, On Tue, Apr 21, 2020 at 12:59:15PM +0000, Lennert Van Alboom wrote: > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On Sunday, 19 April 2020 17:02, Lennert Van Alboom <lennert@vanalboom.org> wrote: > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Sunday, 19 April 2020 15:56, Uwe Kleine-König uwe@kleine-koenig.org wrote: > > > Do you have INTEL_IOMMU and INTEL_IOMMU_DEFAULT_ON included in your > > > custom kernel? (If only the former: Do you suffer from the reported > > > problem when you add intel_iommu=on to the kernel command line?) > > > > > I started with the stock Debian 5.5-rc config, and just did make oldconfig from there on (don't like to stray too far from the official packages). So the option should be identical to the Debian kernels. > > > > > $ grep INTEL_IOMMU Build/kernel/linux-5.7-rc1/.config > > CONFIG_INTEL_IOMMU=y > > CONFIG_INTEL_IOMMU_SVM=y > > > > > CONFIG_INTEL_IOMMU_DEFAULT_ON is not set > > > > > ========================================= > > > > > CONFIG_INTEL_IOMMU_FLOPPY_WA=y > > CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON=y > > > > > I don't reboot often, but I'll very likely run into the i915 hang above again soon, so I'll try the intel_iommu=on then. > > > Verified: my 5.7.0-rc1 system with intel_iommu=on can suspend/resume without issues. I brought this problem to the attention of the x86 guys; see above URL for the conversation. Up to now no breaking insights. @Lennert: Did you change your BIOS settings since the problem occured to you? Lenny Szubowicz hinted it might be related to the TPM chip and indeed switching it in the BIOS settings from 2.0 to 1.2 mode makes the problem go away for me. Best regards Uwe
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