I've had to upgrade recently from Mint 17.3 to 18 (fresh install) and since have encountered problems with HDMI output from my notebook to an external TV screen. If I can start a video at all (sometimes Youtube videos will start loading, but refuse playback), both audio and video are buggy.
First there are some visual artifacts that turn pixels of a certain brightness either green or red (this can be seen most prominently on the default Linux Mint background, which uses a circular gradient, so that all pixels of said brightness form a circle).
The other problem is the sound, which is played at 0.5 times its normal speed.
This is not a cable issue; using other cables will yield the same result. My best guess is that it's a "driver thing" but since I'm still pretty new to Linux, I don't have an idea how to solve this.
I have attached my inxi output for details on the hardware involved.
I would appreciate any hints as to sources or solutions to this problem.
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System: Host: m-h-Notebook-Linux Kernel: 4.4.0-34-generic x86_64 (64 bit) Desktop: Cinnamon 3.0.7 Distro: Linux Mint 18 Sarah Machine: System: Notebook (portable) product: W840AU Mobo: Notebook model: W840AU Bios: American Megatrends v: 5.6.5 date: 04/01/2015 CPU: Dual core Intel Core i7-5500U (-HT-MCP-) cache: 4096 KB clock speeds: max: 3000 MHz 1: 2512 MHz 2: 2326 MHz 3: 2744 MHz 4: 2388 MHz Graphics: Card: Intel Broadwell-U Integrated Graphics Display Server: X.Org 1.18.3 drivers: intel (unloaded: fbdev,vesa) Resolution: firstname.lastname@example.org GLX Renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2) GLX Version: 3.0 Mesa 11.2.0 Audio: Card-1 Intel Wildcat Point-LP High Definition Audio Controller driver: snd_hda_intel Card-2 Intel Broadwell-U Audio Controller driver: snd_hda_intel Sound: Advanced Linux Sound Architecture v: k4.4.0-34-generic Network: Card-1: Intel Wireless 7260 driver: iwlwifi IF: wlp2s0 state: up mac: ac:fd:ce:68:45:b1 Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169 IF: enp3s0f1 state: down mac: 80:fa:5b:18:d8:40 Drives: HDD Total Size: 500.1GB (56.0% used) ID-1: /dev/sda model: Samsung_SSD_850 size: 500.1GB Partition: ID-1: / size: 48G used: 7.9G (18%) fs: ext4 dev: /dev/sda5 RAID: No RAID devices: /proc/mdstat, md_mod kernel module present Sensors: System Temperatures: cpu: 54.0C mobo: 12.0C Fan Speeds (in rpm): cpu: N/A Info: Processes: 209 Uptime: 23 min Memory: 1333.9/7905.8MB Client: Shell (bash) inxi: 2.2.35