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Wrong memory info for ATI Radeon video card with `lspci -v` command?

rated 0 times [ 3] [ 0] / answers: 1 / hits: 2347 / 3 Years ago, wed, july 21, 2021, 7:04:29

Could someone help me read this information better, I am suspicious of this line:
Memory at d0000000 (64-bit, prefetchable) [size=256M]

My video card is supposed to have 1GB of memory, however I'm not sure if this output reflects that or if I'm looking at the wrong thing?

01:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])

    Subsystem: ATI Technologies Inc Device 0b00

    Flags: bus master, fast devsel, latency 0, IRQ 44

    Memory at d0000000 (64-bit, prefetchable) [size=256M]

    Memory at fbee0000 (64-bit, non-prefetchable) [size=128K]

    I/O ports at d000 [size=256]

    Expansion ROM at fbec0000 [disabled] [size=128K]

    Capabilities: [50] Power Management version 3

    Capabilities: [58] Express Legacy Endpoint, MSI 00

    Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+

    Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>

    Capabilities: [150] Advanced Error Reporting

    Kernel driver in use: fglrx_pci

    Kernel modules: fglrx, radeon

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3 Years ago

answered 3 Years ago whoppinolo · Accepted Answer

I wouldn't worry about this in that it happens to the best of us. My card has 1536 MB of onboard video RAM yet this is what lspci shows:

03:00.0 VGA compatible controller: nVidia Corporation GF110 [GeForce GTX 580] (rev a1) (prog-if 00 [VGA controller])

        Flags: bus master, fast devsel, latency 0, IRQ 16

        Memory at f9000000 (32-bit, non-prefetchable) [size=16M]

        Memory at e0000000 (64-bit, prefetchable) [size=128M]

        Memory at ee000000 (64-bit, prefetchable) [size=32M]

        I/O ports at 7f00 [size=128]

        [virtual] Expansion ROM at e8000000 [disabled] [size=512K]

        Capabilities: <access denied>

        Kernel driver in use: nvidia

        Kernel modules: nvidia_current, nvidia_current_updates, nouveau, nvidiafb

There are filed bugs and a billion and five forum threads (all around the internet, not just Ubuntu) about this.

I'm personally of the opinion that this is a lspci bug (or feature omission) and that it doesn't actaully effect anything negatively. For nvidia users, I trust nvidia-settings (or Catalyst for the AMD/ATI users) when it reports the value correctly:

enter image description here

X also knows:

oli@bert:~$ grep -i memory /var/log/Xorg.0.log

[    26.504] (--) NVIDIA(0): Memory: 1572864 kBytes

[    26.585] (II) NVIDIA: Using 3072.00 MB of virtual memory for indirect memory

[    26.777] (==) NVIDIA(0): Disabling shared memory pixmaps