今天我把我的ubuntu从12.10升级到13.04版本，但是亮度不能适应。我已经尝试过在 12.10 版本上运行的以前的内核，亮度也无法更改。我的电脑是宏碁 4750G。
我的启动参数：
RAMDISK$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic root=UUID=0f905c49-affc-49b5-809b-4f7eea7dddbf ro quiet splash acpi_backlight=vendor vt.handoff=7
我的显卡详细信息：
RAMDISK$ sudo lspci -vnn | grep -A12 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device [1025:0507]
Flags: bus master, fast devsel, latency 0, IRQ 43
Memory at f3400000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
Expansion ROM at <unassigned> [disabled]
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
00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 [8086:1c3a] (rev 04)
--
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF108M [GeForce GT 540M] [10de:0df4] (rev ff) (prog-if ff)
!!! Unknown header type 7f
03:00.0 Network controller [0280]: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) [168c:002e] (rev 01)
Subsystem: Foxconn International, Inc. Device [105b:e034]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at f3900000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [60] Express Legacy Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-15-17-ff-ff-24-14-12
RAMDISK$
我的亮度界面及其值：
RAMDISK$ for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
/sys/class/backlight/acer-wmi
1
15
/sys/class/backlight/intel_backlight
509
976