[Bug 102236] New: Pcie link speed is gen2 instead of gen3 - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 102236] New: Pcie link speed is gen2 instead of gen3
Date: Tue, 15 Aug 2017 16:14:49 +0000	[thread overview]
Message-ID: <bug-102236-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=102236

            Bug ID: 102236
           Summary: Pcie link speed is gen2 instead of gen3
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: bloblo2017-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 133530
  --> https://bugs.freedesktop.org/attachment.cgi?id=133530&action=edit
lspci pstate 07 0f, vbios.rom nouveau, gtx770bios.rom from my gtx770 card

Hello,
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

Nouveau:
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)
or/and
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

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