Regression: bisected: commit 7c510133d93 breaks video

[Dave Airlie]

On Fri, Sep 20, 2013 at 7:13 AM, Paul Zimmerman
<Paul.Zimmerman at synopsys.com> wrote:
>> From: Dave Airlie [mailto:airlied at gmail.com]
>> Sent: Thursday, September 19, 2013 1:15 PM
>>
>> On Fri, Sep 20, 2013 at 6:10 AM, Daniel Vetter <daniel at ffwll.ch> wrote:
>> > On Thu, Sep 19, 2013 at 06:32:47PM +0000, Paul Zimmerman wrote:
>> >> > From: Paul Zimmerman
>> >> > Sent: Thursday, September 19, 2013 11:21 AM
>> >> >
>> >> > > From: Dave Airlie [mailto:airlied at gmail.com]
>> >> > > Sent: Wednesday, September 18, 2013 7:40 PM
>> >> > >
>> >> > > On Thu, Sep 19, 2013 at 12:02 PM, Paul Zimmerman
>> >> > > <Paul.Zimmerman at synopsys.com> wrote:
>> >> > > > I have an ASUS P6X58D-Premium mobo with a GeForce 9400GT PCIe video card.
>> >> > > > With kernel 3.12-rc1, I get scrambled video on boot. Kernel 3.11 works
>> >> > > > fine.
>> >> > > >
>> >> > > > Bisecting this, I found 7c510133d93dd6f15ca040733ba7b2891ed61fd1 "drm:
>> >> > > > mark context support as a legacy subsystem" is the guilty commit. If I
>> >> > > > revert that commit, the video works fine.
>> >> > > >
>> >> > > > Is there any more info I can provide?
>> >> > >
>> >> > > Full dmesg, and what driver you are using.
>> >> >
>> >> > Driver is nouveau.
>> >> >
>> >> > The dmesg from a good boot with the commit reverted is attached.
>> >> >
>> >> > For the bad boot, the dmesg log is filled with messages like this:
>> >> >
>> >> > [   15.871667] nouveau E[     PFB][0000:03:00.0] trapped write at 0x01010010a0 on channel
>> 0x0001fed0
>> >> > [unknown] BAR/PFIFO_WRITE/IN reason: PAGE_NOT_PRESENT
>> >> > [   15.871698] nouveau E[     PFB][0000:03:00.0] trapped write at 0x010100b2e0 on channel
>> 0x0001fed0
>> >> > [unknown] BAR/PFIFO_WRITE/IN reason: PAGE_NOT_PRESENT
>> >> > [   15.871781] nouveau E[     PFB][0000:03:00.0] trapped write at 0x0101011600 on channel
>> 0x0001fed0
>> >> > [unknown] BAR/PFIFO_WRITE/IN reason: PAGE_NOT_PRESENT
>> >> >
>> >> > I will try next with the patch series you sent to Linus yesterday, to
>> >> > see if that happens to fix this.
>> >>
>> >> Nope, with your patch series from yesterday the problem still exists.
>> >
>> > Just to double-check: Does the revert still work, even on latest upstream
>> > git + Dave's pull request?
>>
>> Also what versions of userspace have you got, libdrm +
>> xf86-video-nouveau and mesa?
>
> Yes, the revert still works.
>
> I have pretty old userspace, Fedora 14.
>
> libdrm is 2.4.22-1.fc14, mesa is 7.9-5.fc14.
>
> I don't have xf86-video-nouveau, I have
> xorg-x11-drv-nouveau.x86_64 1:0.0.16-14.20101010git8c8f15c.fc14

Okay it all makes sense now!

I'll revert the patch upstream then, older nouveau userspace used
contexts, for what reason I've no idea :-)

Dave.