Bug 102236 - Pcie link speed is gen2 instead of gen3
Summary: Pcie link speed is gen2 instead of gen3
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: 7.7 (2012.06)
Hardware: x86-64 (AMD64) Linux (All)
: medium major
Assignee: Nouveau Project
QA Contact: Xorg Project Team
Depends on:
Reported: 2017-08-15 16:14 UTC by bloblo
Modified: 2019-12-04 09:30 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

lspci pstate 07 0f, vbios.rom nouveau, gtx770bios.rom from my gtx770 card (117.82 KB, application/gzip)
2017-08-15 16:14 UTC, bloblo
no flags Details

Description bloblo 2017-08-15 16:14:49 UTC
Created attachment 133530 [details]
lspci pstate 07 0f, vbios.rom nouveau, gtx770bios.rom from my gtx770 card

Pcie link speed is gen2 instead of gen3

Kernel version: 4.10.0 (same situation with kern 4.9, 4.11, 4.13-rcx, 4.12 no tested/remember)

My motherboard: x79 with 2 slot pci express 3 support

My graphic card: nvidia (msi) gtx 770 4 gb ddr5 oc edition twin frozr (2x fan)

Xorg: 7.7+19

xserver-xorg-video-nouveau 1.0.13-3
libdrm-nouveau2 2.4.74-1

Dmesg (i compiled kernel with nouveau debug level 4 so very much info (clk, fan etc), i pick just this:
nouveau 0000:02:00.0: pci: pcie max speed: 5.0GT/s
nouveau 0000:02:00.0: DRM: VRAM: 4096 MiB
nouveau 0000:02:00.0: DRM: GART: 1048576 MiB
(clock and pstate are fine and its work)

We are 2 situation:
1- All gtx 770 have this situation (with nouveau)
2- Nvidia disable using 8 gt/s by default (in forums nvidia: is for all cards or only for x79 motherboard maybe ? but give option to enable pci3 with grub and for windows give a small program exe to enable pcie3
(You can default 8gt/s support but you also add nouveau.config=pcie=3 something as nvidia method is your choice)

In attachment:
- lspci with pstate 07
- lspci with pstate 0f
- vbios.rom from nouveau, located in same path of pstate files
- gtx770bios.rom, bios rom of my gtx 770 extracted with gpuz in windows

ps: in lspci link showing max 5gt/s, but with blacklist nouveau, is show 8 gt/s
Comment 1 Martin Peres 2019-12-04 09:30:23 UTC
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