Hello everyone. I wanted to inquire about the layout of: https://wiki.ubuntu.com/Kernel/Debugging/Backlight
Currently, content wise, it is excellent and a great first tutorial on debugging backlight bugs. However, I am finding that when triaging backlight bugs, non-developer bug reporters get confused as to what to do with the article. What I would like to see is the article be split up into two sections, a OR action item list, and a development section. In the OR action item list, this would give ORs specific terminal commands to execute and post the results into their report. The development part would discuss the reasons why one provides each, and debugging discussion. Using my experience as an example: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/863156 https://bugzilla.kernel.org/show_bug.cgi?id=42993 A rough draft template (tags could be embedded that shows it is a command) of just the OR action item list could be: Install the prerequisites: sudo apt-get install -y acpidump fwts dmidecode Execute each of the following via a terminal, and post the results to your report: grep -r . /proc/acpi/video ls /sys/class/backlight sudo acpidump -o acpidump.txt acpixtract acpidump.txt iasl -d DSDT.dat sudo fwts > fwts sudo fwts method > fwts method dmesg|grep 'ACPI: Video' dmidecode > dmidecode.log cat /proc/version * Add kernel parameter: atkbd.softraw=0 to: /boot/grub/menu.lst Then, switch to any console, e.g. Ctrl+Alt+F1, login by root account and execute: showkey -s Then, press Fn+Left and Fn+Right key to check the code that shows up on screen. Post the results to the report. For example: Fn+Left: 0xe0 0x4c 0xe0 0xcc Fn+Right: 0xe0 0x54 0xe0 0xd4 _________________________________________________________ + Thinkpads * Add kernel parameters: thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor Then execute the following and post results to your report: lsmod | grep thinkpad_acpi _________________________________________________________ + Intel * If using an intel board, add the kernel parameter: acpi_backlight=vendor Then execute the following and post results to your report: ls -la /sys/class/backlight/intel_backlight/ * Comment on how the brightness changes if one executes: sudo su sudo echo 8 > /sys/class/backlight/intel_backlight/brightness [END] The debugging section could incorporate the current content, including and below the section: https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Disabling_the_ACPI_backlight_driver As well, follow the current format of discussing each action item (e.g. why to run it, what certain results mean, and further information links). What do you think? -- Christopher M. Penalver E-Mail: [email protected] MCSE:Security, MCSA, MCDST, MCP, Security+, Network+, A+, NSSP This E-Mail was sent via a laptop using Xubuntu, Linux for human beings. www.xubuntu.org http://www.launchpad.net/~penalvch Acer Aspire 5750-9668 Xubuntu 12.04
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