Bug 905947 - Switching off discreet NVIDIA GPU causes kernel panic when changing power state
Summary: Switching off discreet NVIDIA GPU causes kernel panic when changing power state
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-nouveau
Version: 18
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Ben Skeggs
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-01-30 14:51 UTC by Daniel Helgenberger
Modified: 2014-02-05 18:42 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-02-05 18:42:04 UTC
Type: Bug
Embargoed:


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Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 896400 0 unspecified CLOSED i915 and radeon both enabled on vgaswitcheroo at boot 2021-02-22 00:41:40 UTC

Description Daniel Helgenberger 2013-01-30 14:51:41 UTC
Description of problem:
Powering down the dedicated NVIDIA graphics chip results in a x11 kernel panic when switching power states.
See bug 896400.

Version-Release number of selected component (if applicable):
xorg-x11-drv-nouveau-1.0.6-1.fc18.x86_64

How reproducible:
Disable (power down) the unused dedicated nvidia graphics chip and reboot / power down / suspend etc. the computer.

Steps to Reproduce:
1. Boot the computer with switchable graphics enabled in BIOS

2. Check the running on IGD adapter, both apdapters powered (hitting bug 896400)
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IDG:+:Pwr:000xxxxxx
1:DIS: :Pwr:000xxxxxx

3. Powerdown the DIS adapter:
# echo OFF> /sys/kernel/debug/vgaswitcheroo/switch

4. Confirm the swiched off GPU:
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IDG:+:Pwr:000xxxxxx
1:DIS: :Off:000xxxxxx

5. Optional, confirm this with powertop (my notebook actually consumes 5-6W less per h)

6. # reboot
- Panic -

Actual results:
kernel panic

Expected results:

Workaround:
I have tested two workarounds:
1. Disable NVIDIA GPU in BIOS
- or -
2. Powerdown the GPU while X11 not runnung:
# systemctl start multi-user.target
# echo OFF> /sys/kernel/debug/vgaswitcheroo/switch
[   71.046869] VGA switcheroo: switched nouveau off
[   71.048137] nouveau E[   PFIFO][0000:01:00.0] write fault at 0x0000000000 [PAGE_NOT_PRESENT] from PCOPY0/PCOPY0 on channel 0x003fe1b000
[   73.045525] nouveau E[   PFIFO][0000:01:00.0] channel 0 kick timeout
[   73.045575] nouveau E[   PFIFO][0000:01:00.0][0xc000906f][ffff88021c9bed80] failed to detach PCE0 context, -16
[   73.045642] nouveau E[    PCE0][0000:01:00.0][0x0300c01b][ffff88021c64c600] failed suspend, -16
[   73.045747] nouveau E[     DRM] 0xcccc0000:0x000490b5 suspend failed with -16
[   73.045804] nouveau E[     DRM] 0xdddddddd:0xcccc0000 suspend failed with -16
[   73.045919] nouveau E[     DRM] 0xffffffff:0xdddddddd suspend failed with -16
[   73.046010] nouveau E[     DRM] 0xffffffff:0xffffffff suspend failed with -16

# systemctl start graphical.target

This can be done by systemd before 
Additional info:
Requires a notebook with switchable graphics. Tested with Lenovo Thinkpad E330; NVIDIA GT + Intel i915.

Comment 1 Fedora End Of Life 2013-12-21 11:00:00 UTC
This message is a reminder that Fedora 18 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 18. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '18'.

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Comment 2 Fedora End Of Life 2014-02-05 18:42:04 UTC
Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

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