Bug 43741
| Summary: | /sys/class/backlight/ is empty with AMD (ATI) Radeon HD 4350 | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | rpr.nospam |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | normal | CC: | alan, alexdeucher, rpr.nospam, rui.zhang |
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| Kernel Version: | 3.2.0-26-generic | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 56331 | ||
| Attachments: |
/var/log/dmesg
output of lsmod output of 'sudo lspci -vvnn' output of 'sudo acpidump' |
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Created attachment 74181 [details]
output of lsmod
Created attachment 74191 [details]
output of 'sudo lspci -vvnn'
Created attachment 74201 [details]
output of 'sudo acpidump'
there is no ACPI Backlight control on your laptop. so sorry I can not help you on this. re-assign to the graphics expert. If your laptop uses the backlight controller on the GPU, there is support for it in kernel 3.7. |
Created attachment 74171 [details] /var/log/dmesg Hi! On an Ubuntu 12.04 PC with Linux 3.2.0-26-generic x86_64 and AMD (ATI) Radeon HD 4350 VGA controller the kernel does not recognize the ability of the VGA to change brightness of the connected monitor (HP LA2405wg). /sys/class/backlight/ is empty and tools for brightness control report errors. I tried the following options in /etc/default/grub (and updated grub configuration after the change): GRUB_CMDLINE_LINUX="pcie_aspm=force acpi_osi=Linux acpi_backlight=vendor" but to no avail. -- rpr.