https://bugzilla.kernel.org/show_bug.cgi?id=27452
Summary: Backlight control broken on Vaio SZ650
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-rc1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
This commit introduces a bug that prevents backlight control from either
hotkeys or xbacklight. The video adapter is a Intel Corporation Mobile
GM965/GL960 Integrated Graphics Controller (rev 0c).
6d5bbf00d251cc73223a71422d69e069dc2e0b8d is the first bad commit
commit 6d5bbf00d251cc73223a71422d69e069dc2e0b8d
Author: Len Brown <[email protected]>
Date: Fri Jan 7 01:46:40 2011 +0100
ACPI: Use ioremap_cache()
Although the temporary boot-time ACPI table mappings
were set up with CPU caching enabled, the permanent table
mappings and AML run-time region memory accesses were
set up with ioremap(), which on x86 is a synonym for
ioremap_nocache().
Changing this to ioremap_cache() improves performance as
seen when accessing the tables via acpidump,
or /sys/firmware/acpi/tables. It should also improve
AML run-time performance.
No change on ia64.
Reported-by: Jack Steiner <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
:040000 040000 2657fb60f4b7176b4c3599d8723222eef4c6c58d
a0aa669cc80f2804ebc73818e8df16d7cc147cdf M arch
:040000 040000 a27e58b84f29112d0d2717d71e52fafba08cfdaf
3c51f290a55060d35f04cc1a8768c3b0b5b68b36 M drivers
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