[Toshiba Portege Z935-ST4N03] Intel video: Display backlight cannot be changed
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Low
|
Unassigned |
Bug Description
On my Toshiba Portege Z935-ST4N03 laptop, the display hotkeys and display brightness settings do not work at all.
Symptoms:
1. When I use Fn F6 or Fn F7, I get a pop-up window that shows a light bulb and a slider, and the slider goes obediently up and down as I press F6/7. However, the brightness of the screen does not change as the slider indicator changes.
2. If I go into the Power Manager and set the display brightness to dim after a few seconds has passed, it doesn't dim.
So it seems to me that the hotkeys are being recognized as a method to change the display brightness, but that the operating system is unable to change the hardware's actual screen brightness... I don't think it's a hotkey problem per se.
I read through https:/
Backlight control does not work, but there are entries in /sys/class/
Although I do not seem to have the Brightness applet on my system (I am running XFCE, so maybe that is why), but the Power Manager's brightness control is definitely not working.
This is a recent install of Ubuntu, on a newly purchased laptop, so I have no idea whether it was working in previous versions of Ubuntu, kernels, etc. Sorry.
I used the "ubuntu-bug" utility to report this bug, so I am not sure what else you need... but I am starting by attaching the Xorg log, and will attach the lspci output and other information shortly. I am also going to follow the rest of the debugging steps on the Backlight debugging page and attach the output as separate comments on this report.
$ lsb_release -rd
Description: Ubuntu 13.04
Release: 13.04
$apt-cache policy xorg
xorg:
Installed: 1:7.7+1ubuntu4
Candidate: 1:7.7+1ubuntu4
Version table:
*** 1:7.7+1ubuntu4 0
500 http://
100 /var/lib/
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSign
Uname: Linux 3.8.0-27-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
Date: Mon Aug 19 14:01:34 2013
InstallationDate: Installed on 2013-06-17 (62 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
lspci output:
$ lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
01:00.0 System peripheral: Ricoh Co Ltd PCIe SDXC/MMC Host Controller (rev 07)
02:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)
$ lspci -vvnn
00:00.0 Host bridge [0600]: Intel Corporation 3rd Gen Core processor DRAM Controller [8086:0154] (rev 09)
Subsystem: Toshiba America Info Systems Device [1179:0001]
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
Capabilities: <access denied>
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Toshiba America Info Systems Device [1179:0004]
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 44
Region 0: Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at 2000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
00:14.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller [8086:1e31] (rev 04) (prog-if 30 [XHCI])
Subsystem: Toshiba America Info Systems Device [1179:0001]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 40
Region 0: Memory at e0620000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driv...