After suspend: brightness not changeable

Question

Hello,
for the past two weeks I've been trying to solve the last two problems with Arch Linux on my Travelmate C110 - mounting digital camera sucessfully (solved) - and setting lcd brightness after suspend/resume.
Setting lcd brightness using FN-keys, gnome-brightness-applet or terminal () works just fine after a fresh boot.
After first standby/resume (pm-utils) I'm not able to change the brightness whatever I try.
Before and after first suspend/resume the file settings can be changed as intended, but after standby the brightness does not change any more:
echo 10 | sudo dd of=/proc/acpi/video/VGA/LCD/brightness
0+1 Datensätze ein
0+1 Datensätze aus
3 Bytes (3 B) kopiert, 0,00837844 s, 0,4 kB/s
[root@ummon ~]# cat /proc/acpi/video/VGA/LCD/brightness
levels: 0 2 4 6 8 10 12 14 16 18 20
current: 10
System data:
(--) intel(0): Chipset: "852GM/855GM"
core/kernel26 2.6.28.8-1 [installed] (base)
extra/xf86-video-intel 2.4.3-1 [installed] (xorg-video-drivers)
extra/xorg-server 1.5.3-4 [installed] (xorg)
extra/xorg-server-utils 7.4-2 [installed]
Any help on this would be greately appreciated.
Last edited by cywhale (2009-04-01 08:08:34)

Answer 1

Same happens to me, my lspci is:
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02)
00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 (rev 02)
00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 12)
09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)
0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
The only TEMPORAL solution for me is to make a CTRL-F1 and then a CTRL-F7... the video card came back with the correct brightness and also is possible to change it by the bios keys.
Aditional information: Everything works ok before upgrading from 2.6.27 to 2.6.29... at this moment the system is up-to-date!
Last edited by diegognavarro (2009-05-13 18:42:23)