Question for LG Gram users, please join in!
Question for LG Gram users, please join in!
I just became aware today of the following limitation: my laptop (LG Gram 17ZB90R, Raptor Lake-P, Thunderbolt 4) has its
Thunderbolt
PCIe lanes locked at
Gen1 (2.5 GT/s)
instead of Gen3/Gen4!! I am currently running ArchLinux with the latest kernel (6.18.5-zen1). I tested numerous BIOS settings for both TB ports, to no avail.
Questions:
Is there anybody running Linux on their Raptor Lake LG Gram that could confirm this please?
Are
newer
LG Gram laptops running Linux subject to the same limitation?
Do
Windows
users get Gen3 speeds on the same hardware?
Needless to say that this has been devastating to me. See some proof below:
Code:
[dad@DadsGram Workspace]$ powerprofilesctl get
performance
[dad@DadsGram Workspace]$ sudo lspci -vvv -s 00:07.3 2>/dev/null | grep -E "LnkCap:|LnkSta:|LnkCap2:"
[sudo] password for dad:
LnkCap: Port #5, Speed 2.5GT/s, Width x4, ASPM L1, Exit Latency L1 <16us
LnkSta: Speed 2.5GT/s, Width x4
LnkCap2: Supported Link Speeds: 2.5GT/s, Crosslink- Retimer- 2Retimers- DRS-
[dad@DadsGram Workspace]$ grep "bandwidth" ~/Documents/full.log 2>/dev/null | grep -v "failed" | head -5 || journalctl -b | grep "bandwidth" | grep -v "failed" | head -5
Jan 17 17:02:22 DadsGram kernel: pci 0000:2e:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:00:07.3 (capable of 15.752 Gb/s with 8.0 GT/s PCIe x2 link)
Jan 17 17:02:22 DadsGram kernel: pci 0000:2f:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:00:07.3 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)
Jan 17 17:02:28 DadsGram kernel: pci 0000:2e:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:00:07.3 (capable of 15.752 Gb/s with 8.0 GT/s PCIe x2 link)
Jan 17 17:02:28 DadsGram kernel: pci 0000:2f:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:00:07.3 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)