New question #706780 on Ubuntu-Certification: https://answers.launchpad.net/ubuntu-certification/+question/706780
I'm running following laptop: Manufacturer: Dell Inc. Product Name: Precision 3540 Firmware Version: 1.23.0 Board Vendor: Dell Inc. Board Name: 0M14W7 with Ubuntu 20.04.6 LTS and there seems to be hardware problem with the integrated audio. Steps to reproduce: 1. Connect 4K monitor to the single USB-C connector on the laptop using an adapter cable. (I have no-name adapter USB-C to DisplayPort adapter which doesn't show even in lshw output so I assume that's pretty simple.) 2. While monitor is connected to the system, put the system to sleep (S3). 3. Wait a bit and wake up the system. 4. Try to play some audio using the built-in speakers: audio plays fine. 5. Connect 3.5 mm headset (I used Bose QC-25 but I would assume this doesn't matter) 6. Try to play some audio. Expected result: Audio plays just fine and remembers the volume I used the last time headset was used. Actual result: No error messages of any kind appear but nothing can be heard in the headset. If I disconnect the 3.5 mm connector, the speakers will continue playing as expected. In addition, the hardware implemented mic mute with Fn+F4 no longer toggles the led in the button. Workaround: It seems that the headset starts to work again if I now disconnect the USB-C connector, put the system to S3 sleep, wait a bit and wake it without the USB-C connector connected. After the system is again running, playing audio works, the mic mute led works again and connecting the USB-C to DisplayPort adapter makes the external display to work again. It's still unknown if this is a problem in kernel audio device driver or BIOS problem or actual hardware design problem. I haven't been able to test if this happens with a Thunderbird Dock, too, or if the problem is limited to USB-C to DisplayPort adapter only. The monitor connected to DisplayPort is LG 43UD79-B which does contain speakers, in case it makes a difference. Additional info: If 3.5 mm connector is attached while the laptop is booted and external display is not attached to USB-C port, the plug in 3.5 mm port is ignored and all audio goes to the speakers by default. Getting audio to headphones requires disconnecting and re-connecting the 3.5 mm connector while the system is running. Is this a know issue? Is there some way to avoid this problem except the workaround I found out which requires suspending the system and disconnecting and connecting cables which is cumbersome? -- You received this question notification because your team Canonical Hardware Certification is an answer contact for Ubuntu-Certification. -- Mailing list: https://launchpad.net/~canonical-hw-cert Post to : [email protected] Unsubscribe : https://launchpad.net/~canonical-hw-cert More help : https://help.launchpad.net/ListHelp
