Hi,
After installing Linux 5.8-rc7 I seem to get no video output on my
NV36 card once the nouveau module is loaded. The display (connected
to the digital output) simply reports "No Signal".
I bisected to the following commit, and reverting this commit on
top of 5.8-rc7 appears to correct the issue.
fa4f4c213f5f7807360c41f2501a3031a9940f3a is the first bad commit
commit fa4f4c213f5f7807360c41f2501a3031a9940f3a
Author: James Jones
Date: Mon Feb 10 15:15:55 2020 -0800
drm/nouveau/kms: Support NVIDIA format modifiers
Allow setting the block layout of a nouveau FB
object using DRM format modifiers. When
specified, the format modifier block layout and
kind overrides the GEM buffer's implicit layout
and kind. The specified format modifier is
validated against the list of modifiers supported
by the target display hardware.
v2: Used Tesla family instead of NV50 chipset compare
v4: Do not cache kind, tile_mode in nouveau_framebuffer
v5: Resolved against nouveau_framebuffer cleanup
Signed-off-by: James Jones
Signed-off-by: Ben Skeggs
drivers/gpu/drm/nouveau/dispnv50/wndw.c | 20 ---
drivers/gpu/drm/nouveau/nouveau_display.c | 89
++-
drivers/gpu/drm/nouveau/nouveau_display.h | 4 ++
3 files changed, 104 insertions(+), 9 deletions(-)
The dmesg output from loading the driver is identical except several
lines are missing in the non-working case, which I have marked with
"XXX" below:
[ 168.222926] PCI Interrupt Link [LNKE] enabled at IRQ 16
[ 168.223199] nouveau :01:00.0: vgaarb: deactivate vga console
[ 168.224379] Console: switching to colour dummy device 80x25
[ 168.224612] nouveau :01:00.0: NVIDIA NV36 (436200a1)
[ 168.324779] nouveau :01:00.0: bios: version 04.36.20.21.00
[ 168.325646] agpgart-amd64 :00:00.0: AGP 3.0 bridge
[ 168.325657] agpgart: modprobe tried to set rate=x12. Setting to AGP3
x8 mode.
[ 168.325662] agpgart-amd64 :00:00.0: putting AGP V3 device into 8x
mode
[ 168.325679] nouveau :01:00.0: putting AGP V3 device into 8x mode
[ 168.325908] agpgart-amd64 :00:00.0: AGP 3.0 bridge
[ 168.325914] agpgart: modprobe tried to set rate=x12. Setting to AGP3
x8 mode.
[ 168.325918] agpgart-amd64 :00:00.0: putting AGP V3 device into 8x
mode
[ 168.325933] nouveau :01:00.0: putting AGP V3 device into 8x mode
[ 168.325990] nouveau :01:00.0: tmr: unknown input clock freq
[ 168.326732] nouveau :01:00.0: fb: 256 MiB DDR1
[ 168.328174] [TTM] Zone kernel: Available graphics memory: 1022540 KiB
[ 168.328175] [TTM] Initializing pool allocator
[ 168.328181] [TTM] Initializing DMA pool allocator
[ 168.328200] nouveau :01:00.0: DRM: VRAM: 255 MiB
[ 168.328201] nouveau :01:00.0: DRM: GART: 128 MiB
[ 168.328204] nouveau :01:00.0: DRM: BMP version 5.40
[ 168.328208] nouveau :01:00.0: DRM: DCB version 2.2
[ 168.328210] nouveau :01:00.0: DRM: DCB outp 00: 01000300 9c40
[ 168.328214] nouveau :01:00.0: DRM: DCB outp 01: 02010310 9c40
[ 168.328215] nouveau :01:00.0: DRM: DCB outp 02: 04000302
[ 168.328217] nouveau :01:00.0: DRM: DCB outp 03: 02020321 0303
[ 168.328495] nouveau :01:00.0: DRM: Loading NV17 power sequencing
microcode
[ 168.329691] nouveau :01:00.0: DRM: MM: using M2MF for buffer copies
[ 168.330258] nouveau :01:00.0: DRM: Saving VGA fonts
[ 168.389460] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 168.391250] nouveau :01:00.0: DRM: Setting dpms mode 3 on TV
encoder (output 3)
XXX [ 168.487647] nouveau :01:00.0: DRM: allocated 1920x1080 fb: 0x9000,
bo ff426de1
XXX [ 168.491835] fbcon: nouveaudrmfb (fb0) is primary device
XXX [ 168.608512] nouveau :01:00.0: DRM: 0xE4FB: Parsing digital output
script table
XXX [ 168.662451] Console: switching to colour frame buffer device 240x67
XXX [ 168.755987] nouveau :01:00.0: fb0: nouveaudrmfb frame buffer device
[ 168.763736] [drm] Initialized nouveau 1.3.1 20120801 for :01:00.0
on minor 0
Let me know if you need any more info.
Cheers,
Nick
