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[Bart Rose <jbrose3@xxxxxxxxx>]

This bug seems to be back in Lucid Beta 1 on my Acer One 150.

With a stock boot my dmesg reports:

[   14.725138] mtrr: no more MTRRs available
[   14.725148] [drm] MTRR allocation failed.  Graphics performance may suffer.

and a cat /proc/mtrr reports:

reg00: base=0x0fffe0000 ( 4095MB), size=  128KB, count=1: write-protect
reg01: base=0x0fffc0000 ( 4095MB), size=  128KB, count=1: uncachable
reg02: base=0x000000000 (    0MB), size=  512MB, count=1: write-back
reg03: base=0x020000000 (  512MB), size=  512MB, count=1: write-back
reg04: base=0x03f800000 ( 1016MB), size=    8MB, count=1: uncachable
reg05: base=0x03f600000 ( 1014MB), size=    2MB, count=1: uncachable
reg06: base=0x03f500000 ( 1013MB), size=    1MB, count=1: uncachable
reg07: base=0x000000000 (    0MB), size=  128KB, count=1: uncachable

If I pass "enable_mtrr_cleanup mtrr_spare_reg_nr=1" to kernel and
echo "base=0x40000000 size=0x10000000 type=write-combining" > /proc/mtrr on boot, then my dmesg reports:

original variable MTRRs
[    0.000000] reg 0, base: 4194176KB, range: 128KB, type WP
[    0.000000] reg 1, base: 4194048KB, range: 128KB, type UC
[    0.000000] reg 2, base: 0GB, range: 512MB, type WB
[    0.000000] reg 3, base: 512MB, range: 512MB, type WB
[    0.000000] reg 4, base: 1016MB, range: 8MB, type UC
[    0.000000] reg 5, base: 1014MB, range: 2MB, type UC
[    0.000000] reg 6, base: 1013MB, range: 1MB, type UC
[    0.000000] reg 7, base: 0GB, range: 128KB, type UC
[    0.000000] WARNING: BIOS bug: VAR MTRR 7 contains strange UC entry under 1M, check with your system vendor!
[    0.000000] total RAM covered: 1013M
[    0.000000] Found optimal setting for mtrr clean up
[    0.000000]  gran_size: 64K 	chunk_size: 16M 	num_reg: 4  	lose cover RAM: 0G
[    0.000000] New variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 1GB, type WB
[    0.000000] reg 1, base: 1013MB, range: 1MB, type UC
[    0.000000] reg 2, base: 1014MB, range: 2MB, type UC
[    0.000000] reg 3, base: 1016MB, range: 8MB, type UC

and a cat /proc/mtrr reports:

reg00: base=0x000000000 (    0MB), size= 1024MB, count=1: write-back
reg01: base=0x03f500000 ( 1013MB), size=    1MB, count=1: uncachable
reg02: base=0x03f600000 ( 1014MB), size=    2MB, count=1: uncachable
reg03: base=0x03f800000 ( 1016MB), size=    8MB, count=1: uncachable
reg04: base=0x040000000 ( 1024MB), size=  256MB, count=2: write-combining


This seems like a regression. Please let me know if you need more data.

-- 
[i915GM] MTRR entry gets removed when restarting xorg - causes corruption on ttys
https://bugs.launchpad.net/bugs/314928
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