You have been subscribed to a public bug: Ubuntu 9.10 with latest updates, booted with KMS, provides /sys/devices/virtual/backlight/acpi_video0 interface, but changing /sys/devices/virtual/backlight/acpi_video0/brightness has no effect (pressing brightness keys in Gnome says that it changes brightness, but there is no visual effect). Booting with i915.modeset=0 and then xrandr --output LVDS --set BACKLIGHT_CONTROL legacy allows to change display brightness, but I get blinking screen on console (Alt-Ctrl-F1) The trick with lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) setpci -s 00:02.0 F4.B=80 works.
> lsb_release -rd Description: Ubuntu 9.10 Release: 9.10 > uname -a Linux sergey-laptop 2.6.32-020632-generic #020632 SMP Thu Dec 3 10:09:58 UTC 2009 x86_64 GNU/Linux > lspci -vvnn ... 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) Subsystem: Samsung Electronics Co Ltd Device [144d:c03e] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 29 Region 0: Memory at fc000000 (64-bit, non-prefetchable) [size=4M] Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at 1800 [size=8] Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+ Address: fee0300c Data: 41a1 Capabilities: [d0] Power Management version 3 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: i915 Kernel modules: i915 ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New -- samsung x360-aa03 backlight control does not work with KMS https://bugs.edge.launchpad.net/bugs/508737 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp