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Issues with Nouveau when using multiple displays on nVidia GM20x hardware
Some display combinations connected to nVidia GM20x series devices are subject to many errors, observable in `dmesg` and including the message: `DRM: EVO timeout`.
This problem is resolved upstream and a backport is under investigation.
Created attachment 1289740[details]
dmesg
Description of problem:
KMS seems to be broken on GM206, see attached dmesg
Version-Release number of selected component (if applicable):
kernel-3.10.0-680.el7.x86_64
xorg-x11-server-Xorg-1.19.3-7.el7.x86_64
xorg-x11-drv-nouveau-1.0.13-2.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. boot machine with GM206
2.
3.
Actual results:
kernel stuck on lot of messages, see dmesg
Expected results:
machine should enter gdm and further
Additional info:
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM206 [GeForce GTX 960] [10de:1401] (rev a1)
I *believe* (hard to say for sure with the trimmed log), that this is an issue that effects certain combinations of displays on GM20x and higher GPUs. NVIDIA basically split something that was a single hardware concept into two different ones, and added a crossbar between them.
Nouveau in 7.4 doesn't deal with the routing and keeps the two identity-mapped, which can lead to overlapping use of the same hardware blocks with some display combinations.
I recently reworked the display part of Nouveau to handle this, which is a *very* invasive change, and only made it for kernel 4.12. I suspect, at this late stage, we may have to document this issue as known and delay until 7.5?
Created attachment 1308295[details]
dmesg 2
Machine enters gdm and it is possible to login.
Tested with following outputs used:
- only DVI
- 1xDP
- 2xDP
Dmesg look all right.
kernel-3.10.0-693.el7.x86_64
xorg-x11-server-Xorg-1.19.3-11.el7.x86_64
xorg-x11-drv-nouveau-1.0.13-3.el7.x86_64
Created attachment 1289740 [details] dmesg Description of problem: KMS seems to be broken on GM206, see attached dmesg Version-Release number of selected component (if applicable): kernel-3.10.0-680.el7.x86_64 xorg-x11-server-Xorg-1.19.3-7.el7.x86_64 xorg-x11-drv-nouveau-1.0.13-2.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. boot machine with GM206 2. 3. Actual results: kernel stuck on lot of messages, see dmesg Expected results: machine should enter gdm and further Additional info: 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM206 [GeForce GTX 960] [10de:1401] (rev a1)