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Date:   Fri, 20 Nov 2020 11:13:32 +0100
From:   Thomas Zimmermann <>
To:     David Laight <David.Laight@...LAB.COM>,
        Linus Torvalds <>
Cc:     Daniel Vetter <>,
        Linux Kernel Mailing List <>,
        dri-devel <>,
        "Huang, Ray" <>, Dave Airlie <>,
        Christian König <>
Subject: Re: Linux 5.10-rc4; graphics alignment


Am 20.11.20 um 10:52 schrieb David Laight:
>> Hi David
>> Am 18.11.20 um 23:01 schrieb David Laight:
> ...
>> Did you try Daniel's suggestion of testing with the direct parent commit?
> (I was on holiday yesterday and didn't want to spend a sunny
> afternoon doing bisects.)

Makes sense :)

> I've just done that and it is bad.
> Is there any way to bisect through the parts of the
> drm merge patch into v5.10-rc1 ?
> That ought to be quicker (and less error prone) than
> the bisect builds I was doing.
> Note that the stack 'splat' is due to a later change.
> It is separate from the broken pixel alignment.
> I actually saw the vga text go 'funny' while the boot
> was outputting all the [OK] messages (from systemd?)
> before the graphic login stole tty1 (bloody stupid
> to use tty1).
> I don't need to use the failing system today, I'll
> have another go at isolating the failure.

You can use drm-tip for testing, where many of the DRM patches go through.

It's fairly up-to-date.

I have two systems with AST chips and neither shows any of the symptoms 
you describe; nor do we have such reports about drivers that use a 
similar stack (hibmc, bochs). Could you provide the output of

   dmesg | grep drm

Best regards

> 	David
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)

Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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