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Thank you for your understanding. -- 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/1205694 Title: Taichi 21 external screen is not working properly (probably due backlight) Status in “linux” package in Ubuntu: Incomplete Bug description: First of all, I'd like to say that both screen are recognized by xrandr: The internal as eDP1 and the external as DP1. The external screen works under some circumstances, but without backlight. If the computer is off, and I turn on with the lid closed, the external screen "works" If the computer is turned on, on linux, and I restart, the external screen keeps "working". If the computer is off and I turn on with the lid opened or the computer is on windows, using the external screen, and I restart to linux, I can't use the external screen: The image keeps "off". Although, the screen is recognized by xrandr, but no setting turns the screen on (not even xrandr --output DP1 --auto) In the situations that the external screen works, the backlight has no effect on it: When I adjust the backlight (either by the hotkeys, or by echo 50 > /sys/class/backlight/acpi_video0/brightness, or echo 3000 > /sys/class/backlight/intel_backlight/brightness), it just adjusts the internal screen When I use the hotkey to turn off the screen, it just turn off the internal screen Also, if I use xrandr to turn off the external screen, or suspend the computer, the external screen is turned off. When I try again to turn on, or resume it doesn't work. I tried to boot with acpi_backlight=vendor, and again just the internal screen worked properly. The hotkey to change the backlight didn't work, but echo 3000 > /sys/class/backlight/intel_backlight/brightness worked I tried to boot with video.use_bios_initial_backlight=0 and the backlight worked just for the internal screen again I tried to boot with acpi_osi="!Windows 2012", the same thing By running dmesg | grep 'ACPI: Video', I get: [ 4.981826] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) And lspci | grep VGA shows: 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) I don't know if I should get 2 results in them, since I have two screens, but in DSDT, I just see one device with methods _DOS, _DOD, so I guess it is right. There is an if in the BCL, checking if it is Windows 8, but I believe acpi_osi="!Windows 2012", should "fix" it if that was the problem I believe that solving the backlight problem when I'm able to turn on the screen might solve the screen not turning on with the lid open. I tried to use the current Mainline kernel (3.11.0-999, or something like that), but after the boot the external screen was off and the internal was on, not showing anything but a black screen. I followed the Kernel/Debugging/Backlight page and I'll submit all the files that it generated. Thank you for your help! ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-26-generic 3.8.0-26.38 ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2 Uname: Linux 3.8.0-26-generic x86_64 ApportVersion: 2.9.2-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: joao 2437 F.... pulseaudio Date: Sat Jul 27 12:44:02 2013 HibernationDevice: RESUME=UUID=8c6201ab-045c-4bb7-b20d-c4650cca8821 InstallationDate: Installed on 2013-07-23 (4 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: ASUSTeK COMPUTER INC. TAICHI21 MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-26-generic root=UUID=1b4e19b1-47cc-4068-a6d6-b73868b3c9d8 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-26-generic N/A linux-backports-modules-3.8.0-26-generic N/A linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/08/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: TAICHI21.208 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: TAICHI21 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrTAICHI21.208:bd01/08/2013:svnASUSTeKCOMPUTERINC.:pnTAICHI21:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnTAICHI21:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: TAICHI21 dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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