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2 Posts

11-07-2020

Netherlands

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Lenovo T14 AMD - Isses with external screen when docked

2020-11-07, 17:37 PM

Hi all,

I am new to this forum. I recently bought the Lenovo T14 with AMD processor and I am having issues when HDMI display is connected through my USB-C docking station. I initially get an image by after (random) while the screen goes black, however, it is still detected (It is listed when running `xrandr`). I tried to switch from kernel 5.8 to 5.9 but that did not help. I also updated the BIOS to the latest version from 3th of November. If I ran `sudo journalctl` I see this error "[drm:drm_dp_check_act_status [drm_kms_helper]] *ERROR* Failed to get ACT after 3000ms, last status: 00". I tried to google for solution but I came empty-handed. Does anybody know a fix for this problem?

 

I also attach the output of `sudo dmesg | grep drm` in a hope that it helps solve the problem. 

 

[ 7286.157713] [drm] free PSP TMR buffer

[ 7286.944766] [drm] PCIE GART of 1024M enabled (table at 0x000000F400900000).

[ 7286.944832] [drm] PSP is resuming...

[ 7286.964711] [drm] reserve 0x400000 from 0xf47f800000 for PSP TMR

[ 7287.172748] [drm] kiq ring mec 2 pipe 1 q 0

[ 7287.187127] [drm] DMUB hardware initialized: version=0x01000000

[ 7287.460033] [drm] DP Alt mode state on HPD: 1

[ 7287.517600] [drm] DM_MST: starting TM on aconnector: 00000000ab93abce [id: 88]

[ 7287.531215] [drm] VCN decode and encode initialized successfully(under DPG Mode).

[ 7287.531632] [drm] JPEG decode initialized successfully.

[ 7288.111784] [drm] Failed to add display topology, DTM TA is not initialized.

[ 7288.398154] [drm] Failed to add display topology, DTM TA is not initialized.

[ 7381.437310] [drm] amdgpu_dm_irq_schedule_work FAILED src 10

[ 7386.821722] [drm] enabling link 3 failed: 15

[ 7389.891216] [drm:drm_dp_check_act_status [drm_kms_helper]] *ERROR* Failed to get ACT after 3000ms, last status: 00

[ 7390.685996] [drm] enabling link 3 failed: 15

 

 

I welcome any suggestions.

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18 Posts

09-15-2020

Austria

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  • Message 2 of 17

Lenovo T14 AMD - Isses with external screen when docked

2020-11-11, 12:25 PM
I can't help you, but I have a similar problem. I also bought a T14 AMD with USB-C dock Gen2. I only get 30Hz on my 4k screen. On both HDMI and Displayport. If I choose 60hz the screen goes black. I'm having this issue since August. I'm running Fedora 33 on my machine
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2 Posts

11-07-2020

Netherlands

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  • Message 3 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2020-11-11, 12:27 PM

It could be a driver issue. Please have a look at the issue I created: https://gitlab.freedesktop.org/drm/amd/-/issues/1360. Feel free to contribute to the issue. 

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18 Posts

09-15-2020

Austria

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  • Message 4 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2020-11-11, 12:56 PM

I hope the upcoming updates of the dock firmware and t14 amd firmware can solve our problems. The latter was published yesterday but taken offline. Should be back soon according to this tweet. The dock firmware should also be stable soon according to this issue.

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6 Posts

11-21-2020

United States of America

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  • Message 5 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2020-11-22, 0:06 AM
Thanks for the info about upcoming updates. I just got my T14 & Thinkpad USB-C Dock gen2 and also have a few issues that hope firmware fixes. I need to look into fwupd, first time having a computer that supported it. :D
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18 Posts

09-15-2020

Austria

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  • Message 6 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2021-04-23, 21:16 PM

There is a new update available for the Thinkpad USB-C dock gen2. Did it solve your problems? Because it didn't fix mine :/

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33 Posts

05-16-2015

Schweiz

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  • Message 7 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2021-07-12, 18:09 PM

Same issue here. 4k Monitor on USB-C Dock Gen 2 (40AS) and not able to run it @60.

 

Running BIOS 1.32, the newest Dock Firmware and Linux Kernel 5.12.15-arch1-1. Issue also presented here https://www.reddit.com/r/LinuxOnThinkpads/comments/ohr299/usbc_dock_gen_2_40as_t14_amd_4k_monitor_not/ and here https://bbs.archlinux.org/viewtopic.php?id=267890. Would be very nice if someone from Lenovo could look into this issue. I was able to reproduce this issue on Archlinux and Ubuntu. And Ubuntu should be certified for the Lenovo T14 AMD according to Lenovo..

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18 Posts

09-15-2020

Austria

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  • Message 8 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2021-07-12, 21:33 PM

Hey @MarkRHPearson , has the amd team been able to find out what the problem is with external screens (no signal on 4k screen when set to 60hz on 4k screen over usb-c dock gen2)? Could you please give us an update?

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33 Posts

05-16-2015

Schweiz

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  • Message 9 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2021-07-14, 17:58 PM

Just tried Kernel 5.13.1-arch1-1 which contains a few AMD MST related fixes, but our 4k MST issue seems to be still present :(

 

(But it looks like some weird kind of crash issues which happened with 5.12 after plugging in and unplugging the dock multiple times are now gone)

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18 Posts

09-15-2020

Austria

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  • Message 10 of 17

Re:Lenovo T14 AMD - Isses with external screen when docked

2021-07-16, 20:25 PM

I just tried kernel 5.14.0-0.rc1 using Linux Vanilla Kernel repositories for fedora and all problems are solved. I can't believe it!! :D I tried hdmi and displayport, both work. My 4k screen get's instantly detected. Such great news after waiting for a whole year!! I was already thinking about selling my usb-c dock.

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