为什么我的图形内存看起来比我预期的要少?

为什么我的图形内存看起来比我预期的要少?

我在运行 OpenSuSE Leap 15.1 64 位的台式计算机中使用板载图形适配器。在 BIOS 中,我选择为图形适配器分配 1024MB RAM,但操作系统认为它有 256MB。

这种差异有什么明显的原因吗?

lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd Device d000
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915

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