1

I've been using debian 8 from some time, with version 8.9 on dell inspiron 5000 series. Brightness control is missing from the beginning. I don't see brightness controller at all. I installed xbacklight, but of no use. I tried things like: xbacklight -dec 40 . But didn't give any result.

  ls /sys/class/backlight 

returns empty.

Also: /etc/default/grub reads like this:

 GRUB_DEFAULT=0
 GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
 GRUB_CMDLINE_LINUX_DEFAULT="quiet"
 GRUB_CMDLINE_LINUX="initrd=/install/gtk/initrd.gz"

My lspci output is as follows:

 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
 00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)
 00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
 00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #1 (rev 21)
 00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
 00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
 00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
 00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
 00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
 01:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)
 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast Ethernet controller (rev 07)

And cat /proc/cmdline returns -

 BOOT_IMAGE=/boot/vmlinuz-3.16.0-4-amd64 root=UUID=21a0f22c-ec1c-4d3e-809d-ddbbb8019326 ro initrd=/install/gtk/initrd.gz quiet

Any pointers will be greatly appreciated.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.