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TV is a Toshiba 43LF711U20.
USB-C HUB #1 is a Satechi multi-port 4K with Ethernet.
USB-C HUB #2 is a Yishen.
AmazonBasics HDMI cable.
Control computer (for making sure TV isn't busted): Macbook Pro running recent OS X
Kernel: 5.5.13-arch1-1 #1 SMP PREEMPT Wed, 25 Mar 2020 16:04:40 +0000 x86_64 GNU/Linux
Computer I'm trying to get working: Lenovo X1 Yoga 2nd gen
Fully up-to-date.
This gives me three methods to try:
1) USB-C HUB #1, which seems to be the most reliable with alternative computer, a Macbook Pro. Nearly always the TV will appear in xrandr, but the TV itself will not detect any input if I switch it on.
2) USB-C HUB #2, which is unreliable with the Macbook Pro. Again, nearly always the TV will appear in xrandr, but it won't detect input.
3) The HDMI port on the laptop itself. This one gets more interesting. Before bumping the kernel from .10 to .13, if I switched the monitor on, one CPU would jump to 50% (going by my taskbar graph) and sit there pegged. After updating the kernel, I was able to get the TV to display graphics once. However, the graphics were bluish and white. I suspected a colorspace issue, but after figuring out how to switch the colorspace, the TV claims not to receive input again.
Error messages from some of my attempts (unfortunately I don't know which is which, apart from these all being in dmesg after I restarted to .13).
[ 1107.436700] check: Corrupted low memory at 000000008c856b12 (8170 phys) = 1041400000000000
[ 1107.436703] check: Corrupted low memory at 000000007c5e9d20 (8178 phys) = 50005000000000
[ 1107.436704] check: Corrupted low memory at 00000000369423df (8180 phys) = 1e001e00280028
[ 3047.765703] drm: not enough stolen space for compressed buffer (need 36864000 more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.
[ 3049.558501] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training
Memory in the BIOS is at maximum (512M). Thunderbolt security is at USB and DisplayPort.
In addition, even without the external display, there's a persistent bug where the computer will freeze momentarily for 1-2 seconds every minute or so. This started happening after an update a couple weeks back, but I don't know how to begin to search for it. It's annoying, but it does retain memory of keystrokes, so still usable.
Thanks.
Last edited by spease (2020-03-30 07:51:33)
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