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On 2016-08-26 16:09, Corbin Bird wrote: |
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> >> I don't remember if you specified your appended command-line kernel |
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> >> parameters ( lilo / grub / grub2 ). I have an AMD Phenom II x4 980. The |
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> >> parameters have a major effect on the video ( i.e. AGP / IOMMU usage ). |
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> Try setting up the IOMMU. ( Stabilize memory setup / management ) |
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> |
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> The IOMMU is really a modified "AGP bridge" built into the CPU. |
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> |
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> Typical dmesg output : |
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> [ 0.000000] AGP: No AGP bridge found |
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> |
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> If you don't create a "reserved for the AGP Aperature" memory block or |
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> setup the IOMMU, the kernel will setup 64Mg of memory and reserve it for |
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> "e820 -> AGP Aperature". If the IOMMU is not setup, it will |
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> automatically use ALL of the "AGP Aperature Reserved" memory. |
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> |
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> The added kernel parameter for ( AGP / IOMMU on x86_64 ) : |
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> iommu=memaper[=1],noaperture |
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> |
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> This sets up 64Mg for the IOMMU, and tells it "do not touch 'reserved |
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> for the AGP Aperature' memory". |
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> ( Software IO TLB is now preferred / automatic on 4.1.xx kernels. ) |
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> |
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> Typical dmesg output : |
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> [ 0.636904] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40 |
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> [ 0.637060] AMD-Vi: Interrupt remapping enabled |
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> [ 0.644282] AMD-Vi: Lazy IO/TLB flushing enabled |
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> [ 0.717543] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) |
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> [ 0.717700] software IO TLB [mem 0xb9ee4000-0xbdee4000] (64MB) mapped |
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> at [ffff8800b9ee4000-ffff8800bdee3fff] |
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> |
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> KMS enabled X drivers need this setup on ( Fam10h / Fam15h ) CPUs. |
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Some of the dmesg output on my system: |
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root@matica ~ # dmesg | fgrep -e AGP -e IOMMU -e TLB |
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[ 0.000000] AGP: No AGP bridge found |
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[ 0.000000] AGP: Checking aperture... |
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[ 0.000000] AGP: No AGP bridge found |
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[ 0.000000] AGP: Node 0: aperture [bus addr 0xa4000000-0xa5ffffff] (32MB) |
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[ 0.000000] AGP: Your BIOS doesn't leave an aperture memory hole |
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[ 0.000000] AGP: Please enable the IOMMU option in the BIOS setup |
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[ 0.000000] AGP: This costs you 64MB of RAM |
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[ 0.000000] AGP: Mapping aperture over RAM [mem 0xa4000000-0xa7ffffff] (65536KB) |
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[ 0.005699] Last level iTLB entries: 4KB 512, 2MB 16, 4MB 8 |
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[ 0.005700] Last level dTLB entries: 4KB 512, 2MB 128, 4MB 64, 1GB 0 |
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[ 0.802036] PCI-DMA: Disabling AGP. |
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[ 0.802111] PCI-DMA: using GART IOMMU. |
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[ 0.802113] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture |
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Do your recommendations still hold? |
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FWIW my BIOS setup has no option even remotely mentioning IOMMU, so I |
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don't know what the kernel is trying to tell me there. |
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This video is integrated with my motherboard (Gigabyte GA-880GM) and it |
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is not an external card plugged into a slot. |
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The kernel module is radeon and I'm pretty sure kernel modesetting is |
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the default. |
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Lastly, I never had this problem with 3.x kernels and the same hardware |
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(on Debian, and I think the last I used was 3.12, but I could be wrong |
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by a couple). |
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Thanks for trying to help! |
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-- |
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Please *no* private Cc: on mailing lists and newsgroups |
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Why does the arrow on Hillary signs point to the right? |
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