Hi there, Thanks a lot for the reply. Before I tried your suggestions, I got a system problem message, so just to be safe I did a fresh install of Ubuntu 13.10, tested the backlight (still the same issue), then installed linux-image-3.12.0-031200-generic_3.12.0-031200.201311031935_i386.deb (as you mentioned v3.12), tested the backlight, no change. After that I did a fresh install again (no change in the backlight issue) to install linux-image-3.13.0-031300rc3-generic_3.13.0-031300rc3.201312061335_i386.deb (because you linked to v3.13) but the problem still persists.
In neither versions I could see them being mentioned in the boot menu, so does this count as 'kernel-unable-to-test-upstream'? During the boot with the latter version there were two messages, the first one being: "[ 0.000000] tsc: Fast TSC calibration failed" I couldn't capture the second message as it was too long and disappeared too quickly (if you really need to know what it said, then I could try to find out anyway, maybe if you could tell me how to freeze the message for long enough?). Those messages turned from white to yellow font and then Ubuntu booted up fine (well, after some boots the clock and 'shut down' buttons were missing). Please let me know if I can do anything else to help solve this issue. Thanks again! Christine > Date: Fri, 6 Dec 2013 20:23:09 +0000 > From: joseph.salisb...@canonical.com > To: xmastr...@hotmail.com > Subject: [Bug 1258495] Re: backlight too bright, can't dim it much > > Would it be possible for you to test the latest upstream kernel? Refer > to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest > v3.12 kernel[0]. > > If this bug is fixed in the mainline kernel, please add the following > tag 'kernel-fixed-upstream'. > > If the mainline kernel does not fix this bug, please add the tag: > 'kernel-bug-exists-upstream'. > > If you are unable to test the mainline kernel, for example it will not boot, > please add the tag: 'kernel-unable-to-test-upstream'. > Once testing of the upstream kernel is complete, please mark this bug as > "Confirmed". > > > Thanks in advance. > > [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc3-trusty/ > > > ** Changed in: linux (Ubuntu) > Importance: Undecided => Medium > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1258495 > > Title: > backlight too bright, can't dim it much > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258495/+subscriptions -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1258495 Title: backlight too bright, can't dim it much Status in “linux” package in Ubuntu: Confirmed Bug description: Screen is far too bright, dims only slightly with hotkeys, brightness control applet ineffective. Tried more than half a dozen solutions (incl. editing the grub which used to work fine with Ubuntu 12.04) but none of them worked. thindi@thindi-AOA110:~$ ls /sys/class/backlight > backlight thindi@thindi-AOA110:~$ grep -r . /proc/acpi > acpi grep: /proc/acpi/event: Permission denied thindi@thindi-AOA110:~$ sudo acpidump -o acpidump.txt thindi@thindi-AOA110:~$ acpixtract acpidump.txt Acpi table [DSDT] - 24038 bytes written to DSDT.dat Acpi table [SSDT] - 1220 bytes written to SSDT.dat thindi@thindi-AOA110:~$ iasl -d DSDT.dat Intel ACPI Component Architecture AML Disassembler version 20100528 [Dec 19 2012] Copyright (c) 2000 - 2010 Intel Corporation Supports ACPI Specification Revision 4.0a Loading Acpi table from file DSDT.dat Acpi table [DSDT] successfully installed and loaded Pass 1 parse of [DSDT] Pass 2 parse of [DSDT] Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions) ................................................................................................................................................................................................................................................................................................................................................................... Parsing completed Disassembly completed, written to "DSDT.dsl" thindi@thindi-AOA110:~$ sudo fwts > fwts Test: Gather kernel system information. Gather kernel signature. 1 info only Gather kernel system information. 1 info only Gather kernel boot command line. 1 info only Gather ACPI driver version. 1 info only Test: Gather BIOS DMI information. Gather BIOS DMI information 1 info only Test: Scan kernel log for Oopses. Kernel log oops check. 2 passed Test: Scan kernel log for errors and warnings. Kernel log error check. 1 passed Test: MTRR validation. Validate the kernel MTRR IOMEM setup. 1 failed Validate the MTRR setup across all processors. 1 passed Check for AMD MtrrFixDramModEn being cleared by the .. 1 skipped Test: General ACPI information check. Determine Kernel ACPI version. 1 info only Determine machine's ACPI version. 1 info only Determine AML compiler. 1 info only Test: Ubuntu UEFI secure boot test. Test aborted.. Test: Check for UEFI Compatibility Support Module. Check for UEFI Compatibility Support Module. 1 info only Test: Checks firmware has set PCI Express MaxReadReq to a higher value on.. Check firmware settings MaxReadReq for PCI Express d.. 1 failed Test: Check PCI host bridge configuration using _CRS. Check PCI host bridge configuration using _CRS. 1 skipped Test: PCIe ASPM check. PCIe ASPM ACPI test. PCIe ASPM registers test. 3 passed, 10 warnings Test: HPET configuration test. Check HPET base in kernel log. Check HPET base in HPET table. 1 passed Check HPET base in DSDT and/or SSDT. Sanity check HPET configuration. Test: Test DMI/SMBIOS tables for errors. Find and Check SMBIOS Table Entry Point. 6 passed Test DMI/SMBIOS tables for errors. 31 passed, 2 failed Test: Check if system is using latest microcode. Check for most recent microcode being loaded. Test: MSR register tests. Check CPU generic MSRs. 45 passed, 2 failed Check CPU specific model MSRs. 20 passed, 1 failed Check all P State Ratios. 2 passed Check C1 and C3 autodemotion. 1 passed Check SMRR MSR registers. Test: Test if CPU NX is disabled by the BIOS. Check CPU NX capability. 1 passed Check all CPUs have same BIOS set NX flag. 1 passed Check all CPUs have same msr setting in MSR 0x1a0. 1 passed Test: CPU frequency scaling tests. CPU P-State Checks. 1 passed Test: Check max CPU frequencies against max scaling frequency. Maximum CPU frequency check. 1 passed Test: Test CPU Virtualisation Configuration. Check CPU Virtualisation Configuration. 1 skipped Test: Check BIOS Support Installation structure. Check PnP BIOS Support Installation structure. 2 passed Test: Check PCI IRQ Routing Table. PCI IRQ Routing Table. Test: OS/2 memory hole test. Check the OS/2 15Mb memory hole is absent. 1 passed Test: Check MultiProcessor Tables. Test skipped.. Test: Check HDA Audio Pin Configs. Check HDA Audio Pin Configs. 1 passed Test: Validate EBDA region is mapped and reserved in memory map table. Check EBDA is reserved in E820 table. 1 passed Test: Check BIOS32 Service Directory. Check BIOS32 Service Directory. Test: APIC Edge/Level Check. Legacy and PCI Interrupt Edge/Level trigger checks. 1 passed Test: Extract and analyse Windows Management Instrumentation (WMI). Check Windows Management Instrumentation 7 passed, 3 failed Test: Test ACPI Wakealarm. Check existence of /sys/class/rtc/rtc0/wakealarm. 1 passed Trigger wakealarm for 1 seconds in the future. 1 passed Check if wakealarm is fired. 1 passed Multiple wakealarm firing tests. 1 passed Test: Re-assemble DSDT and find syntax errors and warnings. Disassemble and reassemble DSDT 9 failed Disassemble and reassemble SSDT 1 passed Test: Processor Clocking Control (PCC) Test. Check PCCH. 1 info only Test: Disassemble DSDT to check for _OSI("Linux"). Disassemble DSDT to check for _OSI("Linux"). 2 warnings Test: ACPI DSDT Method Semantic Tests. Check Method Names. 1 passed Check _AEI. 1 skipped Check _DDN (DOS Device Name). 1 skipped Check _HID (Hardware ID). 26 passed Check _HRV (Hardware Revision Number). 1 skipped Check _PLD (Physical Device Location). 1 skipped Check _SUB (Subsystem ID). 1 skipped Check _SUN (Slot User Number). 1 skipped Check _STR (String). 1 skipped Check _UID (Unique ID). 10 passed Check _CRS (Current Resource Settings). 20 passed Check _DIS (Disable). 8 passed Check _DMA (Direct Memory Access). 1 skipped Check _FIX (Fixed Register Resource Provider). 1 skipped Check _GSB (Global System Interrupt Base). 1 skipped Check _HPP (Hot Plug Parameters). 1 skipped Check _PRS (Possible Resource Settings). 8 passed Check _PXM (Proximity). 1 skipped Check _EDL (Eject Device List). 1 skipped Check _EJD (Ejection Dependent Device). 1 skipped Check _EJ0 (Eject). 1 skipped Check _EJ1 (Eject). 1 skipped Check _EJ2 (Eject). 1 skipped Check _EJ3 (Eject). 1 skipped Check _EJ4 (Eject). 1 skipped Check _LCK (Lock). 1 skipped Check _RMV (Remove). 10 passed Check _STA (Status). 12 passed Check _BDN (BIOS Dock Name). 1 skipped Check _BBN (Base Bus Number). 1 passed Check _DCK (Dock). 1 skipped Check _INI (Initialize). 2 passed Check _SEG (Segment). 1 skipped Check _OFF (Set resource off). 1 skipped Check _ON (Set resource on). 1 skipped Check _DSW (Device Sleep Wake). 1 skipped Check _IRC (In Rush Current). 1 skipped Check _PRE (Power Resources for Enumeration). 1 skipped Check _PR0 (Power Resources for D0). 1 skipped Check _PR1 (Power Resources for D1). 1 skipped Check _PR2 (Power Resources for D2). 1 skipped Check _PR3 (Power Resources for D3). 1 skipped Check _PS0 (Power State 0). 1 skipped Check _PS1 (Power State 1). 1 skipped Check _PS2 (Power State 2). 1 skipped Check _PS3 (Power State 3). 1 skipped Check _PSC (Power State Current). 1 skipped Check _PSE (Power State for Enumeration). 1 skipped Check _PSW (Power State Wake). 5 passed Check _S1D (S1 Device State). 1 skipped Check _S2D (S2 Device State). 1 skipped Check _S3D (S3 Device State). 1 skipped Check _S4D (S4 Device State). 1 skipped Check _S0W (S0 Device Wake State). 1 skipped Check _S1W (S1 Device Wake State). 1 skipped Check _S2W (S2 Device Wake State). 1 skipped Check _S3W (S3 Device Wake State). 1 skipped Check _S4W (S4 Device Wake State). 1 skipped Check _S0_ (S0 System State). 1 passed Check _S1_ (S1 System State). 1 skipped Check _S2_ (S2 System State). 1 skipped Check _S3_ (S3 System State). 1 skipped Check _S4_ (S4 System State). 1 passed Check _S5_ (S5 System State). 1 passed Check _SWS (System Wake Source). 1 skipped Check _PSS (Performance Supported States). 1 skipped Check _CPC (Continuous Performance Control). 1 skipped Check _CSD (C State Dependencies). 1 skipped Check _CST (C States). 1 skipped Check _PCT (Performance Control). 1 skipped Check _PDL (P-State Depth Limit). 1 skipped Check _PPC (Performance Present Capabilities). 1 skipped Check _PPE (Polling for Platform Error). 1 skipped Check _TDL (T-State Depth Limit). 1 skipped Check _TPC (Throttling Present Capabilities). 1 skipped Check _TSD (Throttling State Dependencies). 1 skipped Check _TSS (Throttling Supported States). 1 skipped Check _ALC (Ambient Light Colour Chromaticity). 1 skipped Check _ALI (Ambient Light Illuminance). 1 skipped Check _ALT (Ambient Light Temperature). 1 skipped Check _ALP (Ambient Light Polling). 1 skipped Check _LID (Lid Status). 1 passed, 1 warnings Check _GCP (Get Capabilities). 1 skipped Check _GRT (Get Real Time). 1 skipped Check _GWS (Get Wake Status). 1 skipped Check _STP (Set Expired Timer Wake Policy). 1 skipped Check _STV (Set Timer Value). 1 skipped Check _TIP (Expired Timer Wake Policy). 1 skipped Check _TIV (Timer Values). 1 skipped Check _SBS (Smart Battery Subsystem). 1 skipped Check _BCT (Battery Charge Time). 1 skipped Check _BIF (Battery Information). 1 passed, 1 warnings Check _BIX (Battery Information Extended). 1 skipped Check _BMA (Battery Measurement Averaging). 1 skipped Check _BMC (Battery Maintenance Control). 1 skipped Check _BMD (Battery Maintenance Data). 1 skipped Check _BMS (Battery Measurement Sampling Time). 1 skipped Check _BST (Battery Status). 1 passed, 1 warnings Check _BTP (Battery Trip Point). 1 skipped Check _BTM (Battery Time). 1 skipped Check _PCL (Power Consumer List). 1 warnings Check _PIF (Power Source Information). 1 skipped Check _PSR (Power Source). 1 passed Check _FIF (Fan Information). 1 skipped Check _FSL (Fan Set Level). 1 skipped Check _FST (Fan Status). 1 skipped Check _ACx (Active Cooling). 10 skipped Check _CRT (Critical Trip Point). 1 skipped Check _DTI (Device Temperature Indication). 1 skipped Check _HOT (Hot Temperature). 1 skipped Check _NTT (Notification Temp Threshold). 1 skipped Check _PSV (Passive Temp). 1 skipped Check _RTV (Relative Temp Values). 1 skipped Check _SCP (Set Cooling Policy). 1 skipped Check _TC1 (Thermal Constant 1). 1 skipped Check _TC2 (Thermal Constant 2). 1 skipped Check _TMP (Thermal Zone Current Temp). 1 skipped Check _TPT (Trip Point Temperature). 1 skipped Check _TSP (Thermal Sampling Period). 1 skipped Check _TST (Temperature Sensor Threshold). 1 skipped Check _TZP (Thermal Zone Polling). 1 skipped Check _PTS (Prepare to Sleep). 5 failed Check _TTS (Transition to State). 1 skipped Check _S0 (System S0 State). 1 skipped Check _S1 (System S1 State). 1 skipped Check _S2 (System S2 State). 1 skipped Check _S3 (System S3 State). 1 skipped Check _S4 (System S4 State). 1 skipped Check _S5 (System S5 State). 1 skipped Check _WAK (System Wake). 5 failed Check _ADR (Return Unique ID for Device). 45 passed Check _BCL (Query List of Brightness Control Levels .. 1 skipped Check _BCM (Set Brightness Level). 1 skipped Check _BQC (Brightness Query Current Level). 1 skipped Check _DCS (Return the Status of Output Device). 6 passed Check _DDC (Return the EDID for this Device). 1 skipped Check _DSS (Device Set State). 6 passed Check _DGS (Query Graphics State). 6 passed Check _DOD (Enumerate All Devices Attached to Displa.. 1 passed Check _DOS (Enable/Disable Output Switching). 1 passed Check _GPD (Get POST Device). 1 skipped Check _ROM (Get ROM Data). 1 passed Check _SPD (Set POST Device). 1 skipped Check _VPO (Video POST Options). 1 skipped Test: MCFG PCI Express* memory mapped config space. Validate MCFG table. 1 passed Validate MCFG PCI config space. 1 passed Test: Simple Fan Tests. Check fan status. 3 passed Load system, check CPU fan status. Test: FADT SCI_EN enabled check. Check FADT SCI_EN bit is enabled. 3 failed Test: Check sane DMA Remapping (VT-d). Check DMA Remapping. 1 skipped Test: Check processor C state support. Check all CPUs C-states. 3 passed Test: Check ACPI table checksum. Check ACPI table checksums. 13 passed Test: Check for single instance of APIC/MADT table. Check single instance of APIC/MADT table. 1 passed Test: ACPI table settings sanity checks. Check ACPI tables. 6 passed, 1 failed thindi@thindi-AOA110:~$ sudo fwts method > fwts_method Test: ACPI DSDT Method Semantic Tests. Check Method Names. 1 passed Check _AEI. 1 skipped Check _DDN (DOS Device Name). 1 skipped Check _HID (Hardware ID). 26 passed Check _HRV (Hardware Revision Number). 1 skipped Check _PLD (Physical Device Location). 1 skipped Check _SUB (Subsystem ID). 1 skipped Check _SUN (Slot User Number). 1 skipped Check _STR (String). 1 skipped Check _UID (Unique ID). 10 passed Check _CRS (Current Resource Settings). 20 passed Check _DIS (Disable). 8 passed Check _DMA (Direct Memory Access). 1 skipped Check _FIX (Fixed Register Resource Provider). 1 skipped Check _GSB (Global System Interrupt Base). 1 skipped Check _HPP (Hot Plug Parameters). 1 skipped Check _PRS (Possible Resource Settings). 8 passed Check _PXM (Proximity). 1 skipped Check _EDL (Eject Device List). 1 skipped Check _EJD (Ejection Dependent Device). 1 skipped Check _EJ0 (Eject). 1 skipped Check _EJ1 (Eject). 1 skipped Check _EJ2 (Eject). 1 skipped Check _EJ3 (Eject). 1 skipped Check _EJ4 (Eject). 1 skipped Check _LCK (Lock). 1 skipped Check _RMV (Remove). 10 passed Check _STA (Status). 12 passed Check _BDN (BIOS Dock Name). 1 skipped Check _BBN (Base Bus Number). 1 passed Check _DCK (Dock). 1 skipped Check _INI (Initialize). 2 passed Check _SEG (Segment). 1 skipped Check _OFF (Set resource off). 1 skipped Check _ON (Set resource on). 1 skipped Check _DSW (Device Sleep Wake). 1 skipped Check _IRC (In Rush Current). 1 skipped Check _PRE (Power Resources for Enumeration). 1 skipped Check _PR0 (Power Resources for D0). 1 skipped Check _PR1 (Power Resources for D1). 1 skipped Check _PR2 (Power Resources for D2). 1 skipped Check _PR3 (Power Resources for D3). 1 skipped Check _PS0 (Power State 0). 1 skipped Check _PS1 (Power State 1). 1 skipped Check _PS2 (Power State 2). 1 skipped Check _PS3 (Power State 3). 1 skipped Check _PSC (Power State Current). 1 skipped Check _PSE (Power State for Enumeration). 1 skipped Check _PSW (Power State Wake). 5 passed Check _S1D (S1 Device State). 1 skipped Check _S2D (S2 Device State). 1 skipped Check _S3D (S3 Device State). 1 skipped Check _S4D (S4 Device State). 1 skipped Check _S0W (S0 Device Wake State). 1 skipped Check _S1W (S1 Device Wake State). 1 skipped Check _S2W (S2 Device Wake State). 1 skipped Check _S3W (S3 Device Wake State). 1 skipped Check _S4W (S4 Device Wake State). 1 skipped Check _S0_ (S0 System State). 1 passed Check _S1_ (S1 System State). 1 skipped Check _S2_ (S2 System State). 1 skipped Check _S3_ (S3 System State). 1 skipped Check _S4_ (S4 System State). 1 passed Check _S5_ (S5 System State). 1 passed Check _SWS (System Wake Source). 1 skipped Check _PSS (Performance Supported States). 1 skipped Check _CPC (Continuous Performance Control). 1 skipped Check _CSD (C State Dependencies). 1 skipped Check _CST (C States). 1 skipped Check _PCT (Performance Control). 1 skipped Check _PDL (P-State Depth Limit). 1 skipped Check _PPC (Performance Present Capabilities). 1 skipped Check _PPE (Polling for Platform Error). 1 skipped Check _TDL (T-State Depth Limit). 1 skipped Check _TPC (Throttling Present Capabilities). 1 skipped Check _TSD (Throttling State Dependencies). 1 skipped Check _TSS (Throttling Supported States). 1 skipped Check _ALC (Ambient Light Colour Chromaticity). 1 skipped Check _ALI (Ambient Light Illuminance). 1 skipped Check _ALT (Ambient Light Temperature). 1 skipped Check _ALP (Ambient Light Polling). 1 skipped Check _LID (Lid Status). 1 passed, 1 warnings Check _GCP (Get Capabilities). 1 skipped Check _GRT (Get Real Time). 1 skipped Check _GWS (Get Wake Status). 1 skipped Check _STP (Set Expired Timer Wake Policy). 1 skipped Check _STV (Set Timer Value). 1 skipped Check _TIP (Expired Timer Wake Policy). 1 skipped Check _TIV (Timer Values). 1 skipped Check _SBS (Smart Battery Subsystem). 1 skipped Check _BCT (Battery Charge Time). 1 skipped Check _BIF (Battery Information). 1 passed, 1 warnings Check _BIX (Battery Information Extended). 1 skipped Check _BMA (Battery Measurement Averaging). 1 skipped Check _BMC (Battery Maintenance Control). 1 skipped Check _BMD (Battery Maintenance Data). 1 skipped Check _BMS (Battery Measurement Sampling Time). 1 skipped Check _BST (Battery Status). 1 passed, 1 warnings Check _BTP (Battery Trip Point). 1 skipped Check _BTM (Battery Time). 1 skipped Check _PCL (Power Consumer List). 1 warnings Check _PIF (Power Source Information). 1 skipped Check _PSR (Power Source). 1 passed Check _FIF (Fan Information). 1 skipped Check _FSL (Fan Set Level). 1 skipped Check _FST (Fan Status). 1 skipped Check _ACx (Active Cooling). 10 skipped Check _CRT (Critical Trip Point). 1 skipped Check _DTI (Device Temperature Indication). 1 skipped Check _HOT (Hot Temperature). 1 skipped Check _NTT (Notification Temp Threshold). 1 skipped Check _PSV (Passive Temp). 1 skipped Check _RTV (Relative Temp Values). 1 skipped Check _SCP (Set Cooling Policy). 1 skipped Check _TC1 (Thermal Constant 1). 1 skipped Check _TC2 (Thermal Constant 2). 1 skipped Check _TMP (Thermal Zone Current Temp). 1 skipped Check _TPT (Trip Point Temperature). 1 skipped Check _TSP (Thermal Sampling Period). 1 skipped Check _TST (Temperature Sensor Threshold). 1 skipped Check _TZP (Thermal Zone Polling). 1 skipped Check _PTS (Prepare to Sleep). 5 failed Check _TTS (Transition to State). 1 skipped Check _S0 (System S0 State). 1 skipped Check _S1 (System S1 State). 1 skipped Check _S2 (System S2 State). 1 skipped Check _S3 (System S3 State). 1 skipped Check _S4 (System S4 State). 1 skipped Check _S5 (System S5 State). 1 skipped Check _WAK (System Wake). 5 failed Check _ADR (Return Unique ID for Device). 45 passed Check _BCL (Query List of Brightness Control Levels .. 1 skipped Check _BCM (Set Brightness Level). 1 skipped Check _BQC (Brightness Query Current Level). 1 skipped Check _DCS (Return the Status of Output Device). 6 passed Check _DDC (Return the EDID for this Device). 1 skipped Check _DSS (Device Set State). 6 passed Check _DGS (Query Graphics State). 6 passed Check _DOD (Enumerate All Devices Attached to Displa.. 1 passed Check _DOS (Enable/Disable Output Switching). 1 passed Check _GPD (Get POST Device). 1 skipped Check _ROM (Get ROM Data). 1 passed Check _SPD (Set POST Device). 1 skipped Check _VPO (Video POST Options). 1 skipped thindi@thindi-AOA110:~$ dmesg | grep 'ACPI: Video' > video thindi@thindi-AOA110:~$ sudo dmidecode > dmidecode.log thindi@thindi-AOA110:~$ cat /proc/version > version o "Reboot with only the kernel parameter acpi_backlight=vendor : " If that means the grub file (excerpt) should look like this: GRUB_DEFAULT=0 GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor" GRUB_CMDLINE_LINUX="" o "Make a comment on if you can now alter the backlight with hotkeys or a brightness applet. " Neither do the job. Maybe this is also important: thindi@thindi-AOA110:~$ sudo gedit /etc/default/grub [sudo] password for thindi: ** (gedit:2082): WARNING **: Could not load Gedit repository: Typelib file for namespace 'GtkSource', version '3.0' not found (gedit:2082): IBUS-WARNING **: The owner of /home/thindi/.config/ibus/bus is not root! thindi@thindi-AOA110:~$ ls /sys/class/backlight > vendorbacklight thindi@thindi-AOA110:~$ sudo su root@thindi-AOA110:/home/thindi# ls -la /sys/class/backlight/intel_backlight/ > lslabacklight root@thindi-AOA110:/home/thindi# echo 8 > /sys/class/backlight/intel_backlight/brightness No change after doing that. o "Reboot with kernel parameter video.use_bios_initial_backlight=0" Don't know how to do that. Dealing with the rest on this site https://wiki.ubuntu.com/Kernel/Debugging/Backlight is out of my depth. Hope the information given helps in any way to fix the bug. Thanks so very much for dealing with this! ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-14-generic 3.11.0-14.21 ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7 Uname: Linux 3.11.0-14-generic i686 ApportVersion: 2.12.5-0ubuntu2.1 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: thindi 1586 F.... pulseaudio /dev/snd/pcmC0D0p: thindi 1586 F...m pulseaudio Date: Fri Dec 6 11:31:38 2013 HibernationDevice: RESUME=UUID=9793476b-8516-4e8d-b628-0dd0389b1376 InstallationDate: Installed on 2013-12-03 (3 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1) MachineType: Acer AOA110 MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=bf6adaec-4e58-4748-95d7-8d287f559046 ro quiet splash pcie_aspm=force acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-14-generic N/A linux-backports-modules-3.11.0-14-generic N/A linux-firmware 1.116 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/06/2008 dmi.bios.vendor: Acer dmi.bios.version: v0.3309 dmi.board.asset.tag: Base Board Asset Tag dmi.board.vendor: Acer dmi.board.version: Base Board Version dmi.chassis.type: 1 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAcer:bvrv0.3309:bd10/06/2008:svnAcer:pnAOA110:pvr1:rvnAcer:rn:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion: dmi.product.name: AOA110 dmi.product.version: 1 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258495/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
