Update: Confirmed that enabling CSM does not solve this stolen memory issue. Additionally, neither does i915.fastboot=1 <- that one was only tried for the sake of completeness, because several forum posts said it did the trick. $ cat /proc/mtrr reg00: base=0x000000000 ( 0MB), size=32768MB, count=1: write-back reg01: base=0x800000000 (32768MB), size= 512MB, count=1: write-back reg02: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable reg03: base=0x0a0000000 ( 2560MB), size= 512MB, count=1: uncachable reg04: base=0x09f000000 ( 2544MB), size= 16MB, count=1: uncachable reg05: base=0x81f000000 (33264MB), size= 16MB, count=1: uncachable reg06: base=0x81ee00000 (33262MB), size= 2MB, count=1: uncachable This is also all wrong, because the BIOS has been configured to reserve 2048M, and obviously that region is missing.
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